VolumeEditor base commit

com.unity.vfx-toolbox/VolumeEditor.meta

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com.unity.vfx-toolbox/VolumeEditor/Editor.meta

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com.unity.vfx-toolbox/VolumeEditor/Editor/Renderers.meta

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com.unity.vfx-toolbox/VolumeEditor/Editor/Renderers/DensityVolumeRenderer.cs

+using UnityEngine;
+using UnityEditor;
+using UnityEditorInternal;
+using System.Collections.Generic;
+using System;
+
+namespace UnityEditor.VFXToolbox.VolumeEditor
+{
+    public class DensityVolumeRenderer : VolumeRendererBase
+    {
+        public float m_DensityScale = 1.0f;
+        public float m_ScatteringScale = 1.0f;
+
+        public float m_LightAngle = 0.0f;
+
+        protected Mesh m_PreviewMesh;
+        protected Material m_PreviewMeshMaterial;
+
+        public DensityVolumeRenderer() : base ()
+        {
+            m_PreviewMeshMaterial = new Material(Shader.Find("Hidden/VFXToolbox/VolumeEditor/VolumeCloud"));
+            CreateMesh();
+        }
+
+        public override void SetTexture(Texture texture)
+        {
+            m_PreviewMeshMaterial.SetTexture("_Volume", texture);
+        }
+
+        public override void Render(PreviewRenderUtility previewUtility)
+        {
+            float time = (float)EditorApplication.timeSinceStartup;
+            
+            m_PreviewMeshMaterial.SetVector("_CameraWorldPosition", previewUtility.camera.transform.position);
+            m_PreviewMeshMaterial.SetVector("_LightDirection", new Vector3(Mathf.Sin(m_LightAngle), -1f, Mathf.Cos(m_LightAngle)).normalized);
+            m_PreviewMeshMaterial.SetFloat("_DensityScale", m_DensityScale);
+            m_PreviewMeshMaterial.SetFloat("_ScatteringScale", m_ScatteringScale);
+            m_PreviewMeshMaterial.SetFloat("_EditorTime", (float)EditorApplication.timeSinceStartup);
+            previewUtility.DrawMesh(m_PreviewMesh, Matrix4x4.identity, m_PreviewMeshMaterial, 0);
+            RenderOutlineCube(previewUtility);
+        }
+
+        public override void OnGUI()
+        {
+            m_DensityScale = EditorGUILayout.Slider("Density Scale", m_DensityScale, 0.0f, 5.0f);
+            m_ScatteringScale = EditorGUILayout.Slider("Scattering Scale", m_ScatteringScale, 0.0f, 2.0f);
+            m_LightAngle = EditorGUILayout.Slider("Light Direction", m_LightAngle, -Mathf.PI, Mathf.PI);
+        }
+
+        protected void CreateMesh()
+        {
+            if(m_PreviewMesh == null)
+                m_PreviewMesh = new Mesh();
+
+            m_PreviewMesh.Clear();
+
+            Vector3[] pos = new Vector3[24]
+            {
+                new Vector3(-0.5f, 0.5f, -0.5f), new Vector3(-0.5f, 0.5f, 0.5f), new Vector3(0.5f, 0.5f, 0.5f), new Vector3(0.5f, 0.5f, -0.5f),
+                new Vector3(-0.5f, -0.5f, -0.5f), new Vector3(-0.5f, -0.5f, 0.5f), new Vector3(-0.5f, 0.5f, 0.5f), new Vector3(-0.5f, 0.5f, -0.5f),
+                new Vector3(0.5f, -0.5f, -0.5f), new Vector3(-0.5f,-0.5f, -0.5f), new Vector3(-0.5f, 0.5f, -0.5f), new Vector3(0.5f, 0.5f, -0.5f),
+                new Vector3(0.5f, -0.5f, 0.5f) , new Vector3(0.5f, -0.5f, -0.5f), new Vector3(0.5f, 0.5f, -0.5f), new Vector3(0.5f, 0.5f, 0.5f),
+                new Vector3(-0.5f, -0.5f, 0.5f), new Vector3(0.5f, -0.5f, 0.5f), new Vector3(0.5f, 0.5f, 0.5f), new Vector3(-0.5f, 0.5f, 0.5f),
+                new Vector3(-0.5f, -0.5f, -0.5f), new Vector3(0.5f, -0.5f, -0.5f), new Vector3(0.5f, -0.5f, 0.5f), new Vector3(-0.5f, -0.5f, 0.5f)
+            };
+
+            Vector3[] nrm = new Vector3[24]
+            {
+                new Vector3(0, 1, 0), new Vector3(0, 1, 0), new Vector3(0, 1, 0), new Vector3(0, 1, 0),
+                new Vector3(0, 0, -1), new Vector3(0, 0, -1), new Vector3(0, 0, -1), new Vector3(0, 0, -1), 
+                new Vector3(-1, 0, 0), new Vector3(-1, 0, 0), new Vector3(-1, 0, 0), new Vector3(-1, 0, 0), 
+                new Vector3(0, 0, 1), new Vector3(0, 0, 1), new Vector3(0, 0, 1), new Vector3(0, 0, 1), 
+                new Vector3(1, 0, 0), new Vector3(1, 0, 0), new Vector3(1, 0, 0), new Vector3(1, 0, 0), 
+                new Vector3(0, -1, 0), new Vector3(0, -1, 0), new Vector3(0, -1, 0), new Vector3(0, -1, 0)
+            };
+
+            List<Vector3> positions = new List<Vector3>(pos);
+            List<Vector3> normals = new List<Vector3>(nrm);
+
+            int[] triangles = new int[36]
+            {
+                0,1,2,
+                0,2,3,
+                4,5,6,
+                4,6,7,
+                8,9,10,
+                8,10,11,
+                12,13,14,
+                12,14,15,
+                16,17,18,
+                16,18,19,
+                20,21,22,
+                20,22,23
+            };
+
+            m_PreviewMesh.SetVertices(positions);
+            m_PreviewMesh.SetNormals(normals);
+            m_PreviewMesh.SetTriangles(triangles, 0);
+            m_PreviewMesh.RecalculateBounds();
+        }
+
+        public override string ToString()
+        {
+            return "Density";
+        }
+    }
+}

com.unity.vfx-toolbox/VolumeEditor/Editor/Renderers/DensityVolumeRenderer.cs.meta

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com.unity.vfx-toolbox/VolumeEditor/Editor/Renderers/DummyRenderer.cs

+using UnityEngine;
+using UnityEditor;
+using UnityEditorInternal;
+using System.Collections.Generic;
+using System;
+
+namespace UnityEditor.VFXToolbox.VolumeEditor
+{
+    public class DummyRenderer : VolumeRendererBase
+    {
+
+        public DummyRenderer() : base()
+        {
+
+        }
+
+        public override void OnGUI()
+        {
+
+        }
+
+        public override void Render(PreviewRenderUtility previewUtility)
+        {
+            RenderOutlineCube(previewUtility);
+            Handles.Label(Vector3.zero, "No Volume Loaded, please drag a Texture3D in this window.");
+        }
+
+        public override void SetTexture(Texture texture)
+        {
+
+        }
+
+        public override string ToString()
+        {
+            return "Dummy";
+        }
+    }
+}

com.unity.vfx-toolbox/VolumeEditor/Editor/Renderers/DummyRenderer.cs.meta

+fileFormatVersion: 2
+guid: 573c7fd050ad4ff498205aaf705ffca2
+timeCreated: 1472652028
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com.unity.vfx-toolbox/VolumeEditor/Editor/Renderers/VectorFieldVolumeRenderer.cs

+using UnityEngine;
+using UnityEditor;
+using UnityEditorInternal;
+using System.Collections.Generic;
+using System;
+
+namespace UnityEditor.VFXToolbox.VolumeEditor
+{
+    public class VectorFieldVolumeRenderer : VolumeRendererBase
+    {
+        public enum ViewMode
+        {
+            VolumeFloaters,
+            SliceFloaters
+        }
+
+        public enum ViewModeSliceAxis
+        {
+            XY,
+            XZ,
+            YZ
+        }
+
+        public ViewMode viewMode { get { return m_ViewMode; } set { SetViewMode(value); } }
+        public ViewModeSliceAxis sliceAxis { get { return m_ViewModeSliceAxis; } set { SetSliceAxis(value); } }
+        public float slicePosition { get { return m_SlicePosition; } set { SetSlicePosition(value); } }
+        public uint reduceFactor { get { return m_ReduceFactor; } set { SetReduceFactor(value); } }
+        public float floaterStep { get { return m_FloaterStep; } set { m_FloaterStep =value; } }
+        public float heatMapScale { get { return m_HeatMapScale; } set { m_HeatMapScale =value; } }
+
+        private uint m_ReduceFactor;
+        private float m_FloaterStep;
+
+        private uint m_VolumeSizeX;
+        private uint m_VolumeSizeY;
+        private uint m_VolumeSizeZ;
+
+        private List<Texture2D> m_HeatMap;
+        private int m_CurrentHeatMap;
+        private float m_HeatMapScale;
+
+        private ViewMode m_ViewMode;
+        private ViewModeSliceAxis m_ViewModeSliceAxis;
+        private float m_SlicePosition;
+
+        protected List<Mesh> m_PreviewMesh;
+
+        protected Material m_PreviewMeshMaterial;
+
+        private const int NUM_POINTS_PER_TRAIL = 32;
+        private const uint MAX_SIZE = 64;
+
+        public VectorFieldVolumeRenderer() : base()
+        {
+            m_VolumeSizeX = 0;
+            m_VolumeSizeY = 0;
+            m_VolumeSizeZ = 0;
+            m_ReduceFactor = 1;
+            m_FloaterStep = 0.03f;
+            m_HeatMapScale = 3.5f;
+            m_ViewMode = ViewMode.VolumeFloaters;
+            m_ViewModeSliceAxis = ViewModeSliceAxis.XY;
+            m_SlicePosition = 0.5f;
+            m_PreviewMeshMaterial = new Material(Shader.Find("Hidden/VFXToolbox/VolumeEditor/VolumeTrail"));
+            m_HeatMap = new List<Texture2D>();
+            m_HeatMap.Add(AssetDatabase.LoadAssetAtPath<Texture2D>("Assets/VFXToolbox/VolumeEditor/Editor/Textures/heatmap.tga"));
+            m_HeatMap.Add(AssetDatabase.LoadAssetAtPath<Texture2D>("Assets/VFXToolbox/VolumeEditor/Editor/Textures/heatmap2.tga"));
+
+            m_PreviewMeshMaterial.SetInt("_NumPointsPerTrail", NUM_POINTS_PER_TRAIL);
+        }
+
+        public override void OnGUI()
+        {
+            viewMode = (ViewMode)EditorGUILayout.EnumPopup("View Mode", viewMode);
+            if(viewMode == ViewMode.SliceFloaters)
+            {
+                sliceAxis = (ViewModeSliceAxis)EditorGUILayout.EnumPopup("Slice Axis", sliceAxis);
+                slicePosition = EditorGUILayout.Slider("Slice Position", slicePosition, 0, 1);
+            }
+
+            reduceFactor = (uint)EditorGUILayout.IntSlider("Reduce By",(int)reduceFactor, 0, 4);
+            floaterStep = EditorGUILayout.Slider("Simulation Step: ", floaterStep, 0.001f, 0.05f);
+            heatMapScale = EditorGUILayout.Slider("HeatMap Scale", heatMapScale, 0.1f, 5.0f);
+            m_CurrentHeatMap = EditorGUILayout.IntPopup("Heat Map Template", m_CurrentHeatMap, new string[] { "Thermal", "Rainbow" }, new int[] { 0, 1 });
+        }
+
+
+        public override void Render(PreviewRenderUtility previewUtility)
+        {
+            if (m_VolumeSizeX > 0 && m_VolumeSizeY > 0 && m_VolumeSizeZ > 0)
+            {
+                if (m_PreviewMesh == null)
+                    RegenerateGeometry();
+                m_PreviewMeshMaterial.SetFloat("_Length", m_FloaterStep);
+
+                m_PreviewMeshMaterial.SetTexture("_HeatMap", m_HeatMap[m_CurrentHeatMap]);
+                m_PreviewMeshMaterial.SetFloat("_HeatMapScale", m_HeatMapScale);
+
+                foreach(Mesh mesh in m_PreviewMesh)
+                    previewUtility.DrawMesh(mesh, Matrix4x4.identity, m_PreviewMeshMaterial, 0);
+
+                RenderOutlineCube(previewUtility);
+            }
+        }
+
+        public override void SetTexture(Texture texture)
+        {
+            if(texture == null)
+            {
+                m_VolumeSizeX = 0;
+                m_VolumeSizeY = 0;
+                m_VolumeSizeZ = 0;
+            }
+            else
+            {
+                Texture3D volume = (Texture3D)texture;
+                 m_PreviewMeshMaterial.SetTexture("_Volume", volume);
+                if(m_VolumeSizeX != (uint)volume.width || m_VolumeSizeY != (uint)volume.height || m_VolumeSizeZ != (uint)volume.depth)
+                {
+                    m_VolumeSizeX = (uint)volume.width;
+                    m_VolumeSizeY = (uint)volume.height;
+                    m_VolumeSizeZ = (uint)volume.depth;
+                    RegenerateGeometry();
+                    m_PreviewMeshMaterial.SetVector("_Dimensions", new Vector4(m_VolumeSizeX, m_VolumeSizeY, m_VolumeSizeZ, 1.0f));
+                }
+            }
+        }
+
+        private void SetReduceFactor(uint factor)
+        {
+            if(factor != m_ReduceFactor)
+            {
+                m_ReduceFactor = factor;
+                m_PreviewMeshMaterial.SetInt("_ReduceFactor", (int)Mathf.Pow(2,reduceFactor));
+            }
+        }
+
+        private void SetViewMode(ViewMode newMode)
+        {
+            if(newMode != m_ViewMode)
+            {
+                m_ViewMode = newMode;
+                RegenerateGeometry();
+
+                switch(m_ViewMode)
+                {
+                    case ViewMode.VolumeFloaters:
+                        SetSlicePosition(0.0f);
+                        break;
+                    default: break;
+                }
+            }
+        }
+
+        private void SetSliceAxis(ViewModeSliceAxis axis)
+        {
+            if(m_ViewModeSliceAxis != axis)
+            {
+                m_ViewModeSliceAxis = axis;
+                RegenerateGeometry();
+            }
+        }
+
+        private void SetSlicePosition(float value)
+        {
+            Vector4 offset = Vector4.zero;
+            m_SlicePosition = value;
+            switch(sliceAxis)
+            {
+                case ViewModeSliceAxis.XY:
+                    offset = new Vector4(0, 0, value, 0);
+                    break;
+                case ViewModeSliceAxis.YZ:
+                    offset = new Vector4(value, 0, 0, 0);
+                    break;
+                case ViewModeSliceAxis.XZ:
+                    offset = new Vector4(0, value, 0, 0);
+                    break;
+            }
+            m_PreviewMeshMaterial.SetVector("_Offset", offset);
+        }
+
+        public void RegenerateGeometry()
+        {
+            switch(m_ViewMode)
+            {
+                case ViewMode.VolumeFloaters:
+                    CreateVolumeFloaterMesh(false, ViewModeSliceAxis.XY);
+                    break;
+                case ViewMode.SliceFloaters:
+                    CreateVolumeFloaterMesh(true, m_ViewModeSliceAxis);
+                    break;
+            }
+        }
+
+        protected void CreateVolumeFloaterMesh(bool bSlice, ViewModeSliceAxis axis)
+        {
+            if(m_PreviewMesh == null)
+                m_PreviewMesh = new List<Mesh>();
+
+            if (m_VolumeSizeX > 0 && m_VolumeSizeY > 0 && m_VolumeSizeZ > 0)
+            {
+                uint indexStride = (NUM_POINTS_PER_TRAIL-1) * 2;
+                uint vertexStride = NUM_POINTS_PER_TRAIL;
+
+                uint numFloatersX = (bSlice && axis == ViewModeSliceAxis.YZ)? 1 : m_VolumeSizeX;
+                uint numFloatersY = (bSlice && axis == ViewModeSliceAxis.XZ)? 1 : m_VolumeSizeY;
+                uint numFloatersZ = (bSlice && axis == ViewModeSliceAxis.XY)? 1 : m_VolumeSizeZ;
+
+                uint numFloaters = numFloatersX * numFloatersY * numFloatersZ;
+
+                uint numVertices = vertexStride * numFloaters;
+                uint numSplits = (numVertices+65535) / 65536;
+
+                if (m_PreviewMesh == null)
+                    m_PreviewMesh = new List<Mesh>();
+
+                m_PreviewMesh.Clear();
+
+                uint maxChunksPerSplit = 65535 / vertexStride;
+                uint chunksLeft = numFloaters;
+
+                Vector3 meshCenter = new Vector3(0.5f, 0.5f, 0.5f);
+
+                for(int i = 0; i < numSplits; i++)
+                {
+                    EditorUtility.DisplayProgressBar("Volume Viewer", "Creating Mesh", (float)i / numSplits);
+                    Mesh mesh = new Mesh();
+                    uint chunkOffset = ((uint)i * maxChunksPerSplit);
+
+                    List<Vector3> vertices = new List<Vector3>();
+
+                    // How many chunks this time?
+                    uint numChunks = (chunksLeft > maxChunksPerSplit) ? maxChunksPerSplit : chunksLeft;
+                    chunksLeft -= numChunks;
+
+                    int[] indices = new int[numChunks * indexStride];
+
+                    // Foreach Chunk
+                    for(uint j = 0; j < numChunks; j++)
+                    {
+                        uint vertexOffset = j * vertexStride;
+                        uint indexOffset =  j * indexStride;
+
+                        // Vertices & UVs
+                        for(uint k = 0; k < vertexStride; k++)
+                        {
+                            Vector3 pos = PositionFromIndex(j + chunkOffset, numFloatersX, numFloatersY, numFloatersZ);
+                            vertices.Add(pos - meshCenter);
+                        }
+
+                        // indices
+                        for(uint k = 0; k < indexStride/2; k++)
+                        {
+                            indices[indexOffset + (k * 2)] = (int)(vertexOffset + k);
+                            indices[indexOffset + (k * 2) + 1] = (int)(vertexOffset + k + 1);
+                        }
+                    }
+
+                    mesh.SetVertices(vertices);
+                    mesh.SetIndices(indices, MeshTopology.Lines, 0);
+
+                    mesh.bounds = new Bounds(Vector3.zero, new Vector3(1, 1, 1));
+                    m_PreviewMesh.Add(mesh);
+                }
+                EditorUtility.ClearProgressBar();
+            }
+        }
+
+        private Vector3 PositionFromIndex(uint index, uint numX, uint numY, uint numZ)
+        {
+            uint x = index % numX;
+            uint y = (index / numX) % numY;
+            uint z = (index / (numX * numY)); 
+            return new Vector3((float)x/numX, (float)y/numY, (float)z/numZ);
+        }
+
+        public override string ToString()
+        {
+            return "Vector Field";
+        }
+    }
+}

com.unity.vfx-toolbox/VolumeEditor/Editor/Renderers/VectorFieldVolumeRenderer.cs.meta

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com.unity.vfx-toolbox/VolumeEditor/Editor/Renderers/VolumeRendererBase.cs

+using UnityEngine;
+using UnityEditor;
+using UnityEditorInternal;
+using System.Collections.Generic;
+
+namespace UnityEditor.VFXToolbox.VolumeEditor
+{
+    public abstract class VolumeRendererBase
+    {
+        private Mesh m_OutlineCubeMesh;
+        private Material m_OutlineCubeMaterial;
+
+        public VolumeRendererBase()
+        {
+            m_OutlineCubeMaterial = new Material(Shader.Find("Unlit/Color"));
+            GenerateOutlineCube();
+        }
+
+        protected void RenderOutlineCube(PreviewRenderUtility previewUtility)
+        {
+            RenderOutlineCube(previewUtility, new Color(1, 1, 1, 0.25f));
+        }
+
+        protected void RenderOutlineCube(PreviewRenderUtility previewUtility, Color color)
+        {
+            m_OutlineCubeMaterial.SetColor ("_Color", color);
+            previewUtility.DrawMesh(m_OutlineCubeMesh, Matrix4x4.identity, m_OutlineCubeMaterial, 0);
+
+        }
+
+        public abstract void Render(PreviewRenderUtility previewUtility);
+
+        public abstract void OnGUI();
+
+        public abstract void SetTexture(Texture texture);
+
+        private void GenerateOutlineCube()
+        {
+            if (m_OutlineCubeMesh == null)
+                m_OutlineCubeMesh = new Mesh();
+
+            m_OutlineCubeMesh.Clear();
+            List<Vector3> vertices = new List<Vector3>();
+            vertices.Add(new Vector3(-0.5f, -0.5f, -0.5f));
+            vertices.Add(new Vector3(-0.5f, -0.5f, 0.5f));
+            vertices.Add(new Vector3(-0.5f, 0.5f, -0.5f));
+            vertices.Add(new Vector3(-0.5f, 0.5f, 0.5f));
+            vertices.Add(new Vector3(0.5f, -0.5f, -0.5f));
+            vertices.Add(new Vector3(0.5f, -0.5f, 0.5f));
+            vertices.Add(new Vector3(0.5f, 0.5f, -0.5f));
+            vertices.Add(new Vector3(0.5f, 0.5f, 0.5f));
+
+            int[] indices = new int[]
+             {
+                0,1,1,3,3,2,2,0,
+                4,5,5,7,7,6,6,4,
+                0,4,1,5,2,6,3,7
+             };
+
+            m_OutlineCubeMesh.SetVertices(vertices);
+            m_OutlineCubeMesh.SetIndices(indices,MeshTopology.Lines,0);
+        }
+
+    }
+}

com.unity.vfx-toolbox/VolumeEditor/Editor/Renderers/VolumeRendererBase.cs.meta

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com.unity.vfx-toolbox/VolumeEditor/Editor/Shaders.meta

+fileFormatVersion: 2
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com.unity.vfx-toolbox/VolumeEditor/Editor/Shaders/SkyGray.shader

+Shader "Hidden/VFXToolbox/Skybox/Gradient"
+{
+	Properties
+	{
+		_BottomColor("BottomColor", Color) = (0.2,0.2,0.2,1.0)
+		_MiddleColor("MiddleColor", Color) = (0.5,0.5,0.5,1.0)
+		_TopColor("TopColor", Color) = (0.2,0.2,0.2,1.0)
+		_VerticalFalloff("Vertical Falloff", range(0.5,4.0)) = 1.0
+		_DitherIntensity("Dither Intensity", range(0.0,0.5)) = 0.01
+	}
+	SubShader
+	{
+	Tags { "Queue"="Background" "RenderType"="Background" "PreviewType"="Skybox" }
+	Cull Off ZWrite Off
+
+		Pass
+		{
+			CGPROGRAM
+			#pragma vertex vert
+			#pragma fragment frag
+			
+			#include "UnityCG.cginc"
+
+			struct appdata
+			{
+				float4 vertex : POSITION;
+				float2 uv : TEXCOORD0;
+			};
+
+			struct v2f
+			{
+				float4 vertex : SV_POSITION;
+				float2 uv : TEXCOORD0;
+				half3 rayDir : TEXCOORD1;	// Vector for incoming ray, normalized ( == -eyeRay )
+				float4 ScreenPos : TEXCOORD2;
+			};
+			
+			float4 _TopColor;
+			float4 _MiddleColor;
+			float4 _BottomColor;
+			float _VerticalFalloff;
+			float _DitherIntensity;
+
+
+			v2f vert (appdata v)
+			{
+				v2f o;
+				o.vertex = UnityObjectToClipPos(v.vertex);
+				o.uv = v.uv;
+
+				// Get the ray from the camera to the vertex and its length (which is the far point of the ray passing through the atmosphere)
+				float3 eyeRay = normalize(mul((float3x3)unity_ObjectToWorld, v.vertex.xyz));
+				o.rayDir = half3(-eyeRay);
+				o.ScreenPos = ComputeScreenPos(o.vertex);
+				return o;
+			}
+
+			float dither4x4(float2 position)
+			{
+				const float kernel[16] = {0.0625, 0.5625, 0.1875, 0.6875, 0.8125, 0.3125, 0.9375, 0.4375, 0.25, 0.75, 0.125, 0.625, 1.0, 0.5, 0.875, 0.375};
+				float v = kernel[(((int)position.y & 3) << 2) + ((int)position.x & 3)];
+				return v;
+			}
+			
+			fixed4 frag (v2f i) : SV_Target
+			{
+				//float2 wcoord = (i.ScreenPos.xy/i.ScreenPos.w);
+				float dither = _DitherIntensity*(dither4x4(i.ScreenPos.xy) - 0.5f);
+
+				float a = -i.rayDir.y;
+				float4 up = lerp(_MiddleColor, _TopColor, pow(saturate(a),_VerticalFalloff + dither));
+				float4 down = lerp(_MiddleColor, _BottomColor, pow(saturate(-a),_VerticalFalloff + dither));
+				fixed4 col;
+				if (a >= 0.0f) col = up;
+				else col = down;
+				return col;
+			}
+			ENDCG
+		}
+	}
+}

com.unity.vfx-toolbox/VolumeEditor/Editor/Shaders/SkyGray.shader.meta

+fileFormatVersion: 2
+guid: aebcf7aaf8bc7354d88b64df85d4dd3e
+timeCreated: 1472719174
+licenseType: Pro
+ShaderImporter:
+  defaultTextures: []
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 

com.unity.vfx-toolbox/VolumeEditor/Editor/Shaders/VolumeCloud.shader

+// Upgrade NOTE: replaced '_Object2World' with 'unity_ObjectToWorld'
+
+Shader "Hidden/VFXToolbox/VolumeEditor/VolumeCloud"
+{
+	Properties
+	{
+		_Volume ("_Volume", 3D) = "white" {}
+		_CameraWorldPosition("_CameraWorldPosition", Vector) = (1,1,1,1)
+		_LightDirection ("_LightDirection", Vector) = (0,-1,0,1)
+		_DensityScale ("_DensityScale", Float) = 0.1
+		_ScatteringScale ("_ScatteringScale", Float) = 1.0
+		_EditorTime("_EditorTime", Float) = 0.0
+	}
+	SubShader
+	{
+		Tags{"RenderType" = "Transparent" "Queue" = "Transparent"}
+		LOD 100
+			ZWrite Off
+			Blend SrcAlpha OneMinusSrcAlpha
+			Cull Back
+		LOD 100
+
+		Pass
+		{
+			CGPROGRAM
+			#pragma vertex vert
+			#pragma fragment frag
+			
+			#include "UnityCG.cginc"
+
+			#define NB_VOLUME_SAMPLES 64
+			#define NB_LIGHT_SAMPLES 64
+			#define DISPLAY_NB_SAMPLES 0
+			#define	DITHER_NOISE 0
+
+			struct appdata
+			{
+				float4 vertex : POSITION;
+			};
+
+			struct v2f
+			{
+				float4 vertex : SV_POSITION;
+				float3 worldpos : TEXCOORD0;
+			};
+
+			sampler3D _Volume;
+			float3 _CameraWorldPosition;
+			float3 _LightDirection;
+			float _DensityScale;
+			float _ScatteringScale;
+			float _EditorTime;
+
+			v2f vert (appdata v)
+			{
+				v2f o;
+				o.vertex = UnityObjectToClipPos(v.vertex);
+				o.worldpos = mul(unity_ObjectToWorld, v.vertex);
+				return o;
+			}
+
+			float simpleNoise(float2 uv)
+			{
+				return frac(sin(dot(uv, float2(12.9898, 78.233))) * 43758.5453);
+			}
+
+			float dither4x4(float2 position, float time)
+			{
+				const float kernel[16] = {0.0625, 0.5625, 0.1875, 0.6875, 0.8125, 0.3125, 0.9375, 0.4375, 0.25, 0.75, 0.125, 0.625, 1.0, 0.5, 0.875, 0.375};
+				float v = kernel[(((int)position.y & 3) << 2) + ((int)position.x & 3)];
+#if DITHER_NOISE
+				return frac(v + simpleNoise(position) + time);
+#else
+				return v;
+#endif
+			}
+
+			float invGaussian(float x, float H)
+			{
+				return 1.0 - (1.0 / pow(H*x + 1.0,2.0));
+			}
+
+			float LightMarch(sampler3D volume, float3 position, int maxSteps)
+			{
+				float3 dir = -normalize(_LightDirection);
+				float acc = 1.0f;
+				float step = 3.4641 / maxSteps;
+
+				for (int i = 0; i < maxSteps; i++)
+				{
+					float f = 3.4641 * (float)i / maxSteps;
+					float3 sampleWorldPos = position + f * dir;
+					float3 samplePos = sampleWorldPos  + 0.5;
+
+					acc *= 1.0f - saturate(tex3Dlod(volume, float4(samplePos, 0.0)) * _DensityScale * _ScatteringScale * step);
+
+					if (abs(samplePos.x - 0.5) > 0.5 || abs(samplePos.y - 0.5) > 0.5 || abs(samplePos.z - 0.5) > 0.5) break;
+					if (acc < 0.1f) return 0.1f;
+				}
+				return acc;
+			}
+
+			float4 RayMarch(sampler3D volume, float3 dir, float3 position, int maxSteps, float dither)
+			{
+				float3 outColor = float3(-1.0f, -1.0f, -1.0f);
+				float step = 3.4641 / maxSteps;
+
+				int i = 0;
+				float acc = 0.0f;
+
+				for (i = 0; i < maxSteps; i++)
+				{
+					float f = 3.4641 * ((float)i + dither) / (float)maxSteps;
+
+					float3 sampleWorldPos = position + f * dir;
+					float3 samplePos = sampleWorldPos + 0.5;
+
+					if (abs(samplePos.x - 0.5) > 0.5 || abs(samplePos.y - 0.5) > 0.5 || abs(samplePos.z - 0.5) > 0.5) break;
+
+					float a = tex3Dlod(volume, float4(samplePos, 4.0)) * _DensityScale * step;
+
+					if (a > 0.001f)
+					{
+						float l = LightMarch(volume, sampleWorldPos, NB_LIGHT_SAMPLES);
+						if (outColor.r < 0.0f)
+							outColor = float3(l, l, l);
+						else
+							outColor = lerp( outColor, float3(l, l, l), a * saturate(1.0f-acc));
+						acc += a;
+					}
+
+					if (acc > 1.0f) break;
+
+				}
+
+#if DISPLAY_NB_SAMPLES
+					return (float4(1, 1, 1, 1) / NB_VOLUME_SAMPLES) * (float)i;
+#else
+					return float4(outColor, acc);
+#endif
+			}
+
+			fixed4 frag (v2f i) : SV_Target
+			{
+				float f = dither4x4(i.vertex.xy, _EditorTime);
+				fixed4 col = RayMarch(_Volume, -normalize(_CameraWorldPosition - i.worldpos), i.worldpos, NB_VOLUME_SAMPLES, f);
+				return col;
+			}
+			ENDCG
+		}
+	}
+}

com.unity.vfx-toolbox/VolumeEditor/Editor/Shaders/VolumeCloud.shader.meta

+fileFormatVersion: 2
+guid: 0bb96eb486d6dba4899c943113e5e9fd
+timeCreated: 1472032889
+licenseType: Pro
+ShaderImporter:
+  defaultTextures: []
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 

com.unity.vfx-toolbox/VolumeEditor/Editor/Shaders/VolumeTrailRenderer.shader

+Shader "Hidden/VFXToolbox/VolumeEditor/VolumeTrail"
+{
+	Properties
+	{
+		_Volume("_Volume", 3D) = "white" {}
+		_NumPointsPerTrail("_NumPointsPerTrail", Int) = 2
+		_ReduceFactor("_ReduceFactor", Int) = 1
+		_Length("_Length", Float) = 0.1
+		_HeatMap("_HeatMap", 2D) = "white" {}
+		_HeatMapScale("_HeatMapScale", Float) = 1.0
+		_Dimensions("_Dimensions", Vector) = (1.0,1.0,1.0,1.0)
+		_Offset("_Offset", Vector) = (0.0,0.0,0.0,0.0)
+	}
+	SubShader
+	{
+		Tags { "RenderType"="Opaque" }
+		LOD 100
+
+		Pass
+		{
+			CGPROGRAM
+			#pragma vertex vert
+			#pragma fragment frag
+			#pragma target 3.0
+
+			#include "UnityCG.cginc"
+
+			struct appdata
+			{
+				float4 vertex : POSITION;
+			};
+
+			struct v2f
+			{
+				float4 vertex : SV_POSITION;
+				float4 color : COLOR0;
+			};
+
+			sampler3D _Volume;
+			sampler2D _HeatMap;
+			uint _NumPointsPerTrail;
+			uint _ReduceFactor;
+			float _Length;
+			float _HeatMapScale;
+			float4 _Dimensions;
+			float4 _Offset;
+
+			bool Reduce(float3 pos)
+			{
+				uint x = floor(pos.x * _Dimensions.x);
+				uint y = floor(pos.y * _Dimensions.y);
+				uint z = floor(pos.z * _Dimensions.z);
+				return ((x % _ReduceFactor) > 0) || ((y % _ReduceFactor) > 0) || ((z % _ReduceFactor) > 0);
+			}
+
+			v2f vert (appdata v, uint id : SV_VertexID)
+			{
+				v2f o;
+				float3 pos = v.vertex + 0.5f;
+				float4 mag;
+				if (!Reduce(pos))
+				{
+					pos += _Offset;
+					pos += (_ReduceFactor-1) / (_Dimensions * 2);
+					for (uint i = 0; i < id % _NumPointsPerTrail; i++)
+					{
+						float3 val = tex3Dlod(_Volume, float4(pos, 0.0f) + 0.5f/_Dimensions) - 0.5f;
+						pos += val * _Length;
+						mag = tex2Dlod(_HeatMap, float4(pow(length(val), 2)*_HeatMapScale, 0.0f, 0, 0));
+					}
+					o.color = mag;
+					o.vertex = UnityObjectToClipPos(float4(pos - 0.5, v.vertex.w));
+				}
+				else
+				{
+					o.vertex = float4(2, 2, 0, 1);
+					o.color = float4(0, 0, 0, 0);
+				}
+
+				return o;
+			}
+			
+			fixed4 frag (v2f i) : SV_Target
+			{
+				return i.color;
+			}
+			ENDCG
+		}
+	}
+}

com.unity.vfx-toolbox/VolumeEditor/Editor/Shaders/VolumeTrailRenderer.shader.meta

+fileFormatVersion: 2
+guid: 4cf9d45ad59501446971128c5d8ebc14
+timeCreated: 1472647038
+licenseType: Pro
+ShaderImporter:
+  defaultTextures: []
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 

com.unity.vfx-toolbox/VolumeEditor/Editor/Textures.meta

+fileFormatVersion: 2
+guid: fa1b11c22ddfef34b940bcf535cced6a
+folderAsset: yes
+timeCreated: 1472654644
+licenseType: Pro
+DefaultImporter:
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 

com.unity.vfx-toolbox/VolumeEditor/Editor/Textures/heatmap.tga.meta

+fileFormatVersion: 2
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+timeCreated: 1472654644
+licenseType: Pro
+TextureImporter:
+  fileIDToRecycleName: {}
+  serializedVersion: 4
+  mipmaps:
+    mipMapMode: 0
+    enableMipMap: 1
+    sRGBTexture: 1
+    linearTexture: 0
+    fadeOut: 0
+    borderMipMap: 0
+    mipMapFadeDistanceStart: 1
+    mipMapFadeDistanceEnd: 3
+  bumpmap:
+    convertToNormalMap: 0
+    externalNormalMap: 0
+    heightScale: 0.25
+    normalMapFilter: 0
+  isReadable: 0
+  grayScaleToAlpha: 0
+  generateCubemap: 6
+  cubemapConvolution: 0
+  seamlessCubemap: 0
+  textureFormat: 1
+  maxTextureSize: 2048
+  textureSettings:
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+    aniso: -1
+    mipBias: -1
+    wrapMode: 1
+  nPOTScale: 1
+  lightmap: 0
+  compressionQuality: 50
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+  spriteExtrude: 1
+  spriteMeshType: 1
+  alignment: 0
+  spritePivot: {x: 0.5, y: 0.5}
+  spriteBorder: {x: 0, y: 0, z: 0, w: 0}
+  spritePixelsToUnits: 100
+  alphaUsage: 1
+  alphaIsTransparency: 0
+  spriteTessellationDetail: -1
+  textureType: 0
+  textureShape: 1
+  maxTextureSizeSet: 0
+  compressionQualitySet: 0
+  textureFormatSet: 0
+  platformSettings:
+  - buildTarget: DefaultTexturePlatform
+    maxTextureSize: 2048
+    textureFormat: -1
+    textureCompression: 0
+    compressionQuality: 50
+    crunchedCompression: 0
+    allowsAlphaSplitting: 0
+    overridden: 0
+  - buildTarget: Standalone
+    maxTextureSize: 2048
+    textureFormat: -1
+    textureCompression: 0
+    compressionQuality: 50
+    crunchedCompression: 0
+    allowsAlphaSplitting: 0
+    overridden: 0
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+    serializedVersion: 2
+    sprites: []
+    outline: []
+  spritePackingTag: 
+  userData: 
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com.unity.vfx-toolbox/VolumeEditor/Editor/Textures/heatmap2.tga.meta

+fileFormatVersion: 2
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+timeCreated: 1472725757
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+  mipmaps:
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+    linearTexture: 0
+    fadeOut: 0
+    borderMipMap: 0
+    mipMapFadeDistanceStart: 1
+    mipMapFadeDistanceEnd: 3
+  bumpmap:
+    convertToNormalMap: 0
+    externalNormalMap: 0
+    heightScale: 0.25
+    normalMapFilter: 0
+  isReadable: 0
+  grayScaleToAlpha: 0
+  generateCubemap: 6
+  cubemapConvolution: 0
+  seamlessCubemap: 0
+  textureFormat: 1
+  maxTextureSize: 2048
+  textureSettings:
+    filterMode: -1
+    aniso: -1
+    mipBias: -1
+    wrapMode: 1
+  nPOTScale: 1
+  lightmap: 0
+  compressionQuality: 50
+  spriteMode: 0
+  spriteExtrude: 1
+  spriteMeshType: 1
+  alignment: 0
+  spritePivot: {x: 0.5, y: 0.5}
+  spriteBorder: {x: 0, y: 0, z: 0, w: 0}
+  spritePixelsToUnits: 100
+  alphaUsage: 1
+  alphaIsTransparency: 0
+  spriteTessellationDetail: -1
+  textureType: 0
+  textureShape: 1
+  maxTextureSizeSet: 0
+  compressionQualitySet: 0
+  textureFormatSet: 0
+  platformSettings:
+  - buildTarget: DefaultTexturePlatform
+    maxTextureSize: 2048
+    textureFormat: -1
+    textureCompression: 0
+    compressionQuality: 50
+    crunchedCompression: 0
+    allowsAlphaSplitting: 0
+    overridden: 0
+  - buildTarget: Standalone
+    maxTextureSize: 2048
+    textureFormat: -1
+    textureCompression: 0
+    compressionQuality: 50
+    crunchedCompression: 0
+    allowsAlphaSplitting: 0
+    overridden: 0
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+    serializedVersion: 2
+    sprites: []
+    outline: []
+  spritePackingTag: 
+  userData: 
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com.unity.vfx-toolbox/VolumeEditor/Editor/Utility.meta

+fileFormatVersion: 2
+guid: 9c6301786d0554d4897cc84f172cf3c2
+folderAsset: yes
+timeCreated: 1472032558
+licenseType: Pro
+DefaultImporter:
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 

com.unity.vfx-toolbox/VolumeEditor/Editor/Utility/VFFileImporter.cs

+using UnityEngine;
+using System.IO;
+
+namespace UnityEditor.VFXToolbox.VolumeEditor
+{
+    public class VFFileImporter
+    {
+        public static Texture3D LoadVFFile(string filename, TextureFormat textureformat)
+        {
+            BinaryReader br = new BinaryReader(File.OpenRead(filename));
+            string fourcc = new string(br.ReadChars(4));
+            ushort size_x = br.ReadUInt16();
+            ushort size_y = br.ReadUInt16();
+            ushort size_z = br.ReadUInt16();
+
+            int mode = -1;
+            if (fourcc == "VF_F")
+                mode = 0;
+            else if (fourcc == "VF_V")
+                mode = 1;
+            else
+                throw new System.Exception("Invalid VF FourCC");
+
+            if(mode != -1)
+            {
+                Texture3D outputFile = new Texture3D(size_x, size_y, size_z, textureformat, false);
+                ulong length = (ulong)size_x * (ulong)size_y * (ulong)size_z;
+                Color[] colors = new Color[length];
+
+                for(ulong i = 0; i < length; i++)
+                {
+                    if(mode == 0)
+                    {
+                        float val = br.ReadSingle();
+                        colors[i] = new Color(val, val, val);
+                    }
+                    else
+                    {
+                        float r = br.ReadSingle();
+                        float g = br.ReadSingle();
+                        float b = br.ReadSingle();
+                        colors[i] = new Color(r,g,b);
+                    }
+                }
+                outputFile.SetPixels(colors);
+                br.Close();
+                return outputFile;
+            }
+
+            return null;
+
+        }
+    }
+}

com.unity.vfx-toolbox/VolumeEditor/Editor/Utility/VFFileImporter.cs.meta

+fileFormatVersion: 2
+guid: abecc4de2f73df24c8096a448c1fe0ba
+timeCreated: 1472032558
+licenseType: Pro
+MonoImporter:
+  serializedVersion: 2
+  defaultReferences: []
+  executionOrder: 0
+  icon: {instanceID: 0}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 

com.unity.vfx-toolbox/VolumeEditor/Editor/VolumeEditor.cs

+using UnityEngine;
+using UnityEditor;
+using UnityEditorInternal;
+
+namespace UnityEditor.VFXToolbox.VolumeEditor
+{
+    public class VolumeEditor : EditorWindow
+    {
+
+        [MenuItem("Window/Visual Effects/Volume Editor")]
+        public static void OpenVolumeEditor()
+        {
+            EditorWindow.GetWindow<VolumeEditor>();
+        }
+
+        // Debug, temporary
+        [MenuItem("Window/Visual Effects/VF File Importer (Texture3D)")]
+        public static void Create3DTexture()
+        {
+            string filename = EditorUtility.OpenFilePanel("Open VF File", "", "vf");
+            if(filename != null && System.IO.File.Exists(filename))
+            {
+                Texture3D texture = VFFileImporter.LoadVFFile(filename, TextureFormat.ARGB32);
+                string assetFileName = EditorUtility.SaveFilePanelInProject("Save 3D Texture", System.IO.Path.GetFileNameWithoutExtension(filename) + ".asset", "asset", "");
+                if(assetFileName != null)
+                {
+                    AssetDatabase.CreateAsset(texture, assetFileName);
+                }
+            }
+        }
+
+        private VolumeEditorPreview m_Preview;
+
+        private void Initialize()
+        {
+            if (m_Preview == null)
+            {
+                m_Preview = new VolumeEditorPreview();
+                m_Preview.Initialize();
+            }
+        }
+
+        private void HandleDropData()
+        {
+            DragAndDrop.visualMode = DragAndDropVisualMode.Link;
+            if( Event.current.type == EventType.DragExited)
+            {
+                if(DragAndDrop.paths.Length > 0)
+                {
+                    m_Preview.LoadTexture(DragAndDrop.paths[0]);
+                }
+            }
+        }
+
+        public void OnGUI()
+        {
+            Initialize();
+            HandleDropData();
+            titleContent = VFXToolboxGUIUtility.Get("Volume Editor");
+
+            if (Event.current.type == EventType.Repaint)
+            {
+                m_Preview.Render(position);
+                GUI.DrawTexture(new Rect(0,0,position.width, position.height), m_Preview.texture);
+            }
+
+            bool bValueChanged = false;
+
+            Rect previewWindowRect = new Rect(16, 16, 320, 360);
+
+            BeginWindows();
+            GUI.Window(0, previewWindowRect, DrawPreviewRendererGUIWindow, "Preview Options");
+            EndWindows();
+
+            if(!bValueChanged)
+            {
+                m_Preview.HandleMouse(position);
+            }
+
+            Repaint();
+        }
+
+        public void DrawPreviewRendererGUIWindow(int id)
+        {
+            m_Preview.activeRendererIndex = EditorGUILayout.IntPopup("Preview Mode",m_Preview.activeRendererIndex, m_Preview.GetRendererNames(), m_Preview.GetRendererValues());
+            EditorGUILayout.Space();
+            m_Preview.OnRendererGUI();
+        }
+    }
+}

com.unity.vfx-toolbox/VolumeEditor/Editor/VolumeEditor.cs.meta

+fileFormatVersion: 2
+guid: 09c44c13cc054624bb064249e378a95c
+timeCreated: 1472024723
+licenseType: Pro
+MonoImporter:
+  serializedVersion: 2
+  defaultReferences: []
+  executionOrder: 0
+  icon: {instanceID: 0}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 

com.unity.vfx-toolbox/VolumeEditor/Editor/VolumeEditorPreview.cs

+using UnityEngine;
+using UnityEditor;
+using UnityEditorInternal;
+using System.Collections.Generic;
+
+namespace UnityEditor.VFXToolbox.VolumeEditor
+{
+    public class VolumeEditorPreview
+    {
+
+        private enum NavMode
+        {
+            None = 0,
+            Zooming = 1,
+            Rotating = 2
+        }
+
+        public Texture texture { get { return m_PreviewTexture; } }
+        public List<VolumeRendererBase> renderers { get { return m_Renderers; } }
+        public int activeRendererIndex { get { return GetPreviewMode(); } set { SetPreviewMode(value); } }
+
+        private PreviewRenderUtility m_previewUtility;
+        private Texture m_PreviewTexture;
+        private Texture3D m_Volume;
+        private Material m_BackgroundMaterial;
+
+        private List<VolumeRendererBase> m_Renderers;
+        private VolumeRendererBase m_ActiveRenderer;
+
+        private float m_CameraPhi = 0.75f;
+        private float m_CameraTheta = 0.5f;
+        private float m_CameraDistance = 2.0f;
+
+        private NavMode m_NavMode = NavMode.None;
+        private Vector2 m_PreviousMousePosition = Vector2.zero;
+        private DummyRenderer m_DummyRenderer;
+
+        public VolumeEditorPreview()
+        {
+
+        }
+
+        public void Initialize()
+        {
+            if(m_BackgroundMaterial == null)
+            {
+                m_BackgroundMaterial = new Material(Shader.Find("Hidden/VFXToolbox/Skybox/Gradient"));
+                m_BackgroundMaterial.SetFloat("_VerticalFalloff", 4);
+                m_BackgroundMaterial.SetFloat("_DitherIntensity", 0.45f);
+            }
+            if(m_previewUtility == null)
+            {
+                m_previewUtility = new PreviewRenderUtility(false);
+                m_previewUtility.cameraFieldOfView = 50.0f;
+                m_previewUtility.camera.nearClipPlane = 0.1f;
+                m_previewUtility.camera.farClipPlane = 100.0f;
+                m_previewUtility.camera.transform.position = new Vector3(3, 2, 3);
+                m_previewUtility.camera.transform.LookAt(Vector3.zero);
+                m_previewUtility.camera.renderingPath = RenderingPath.Forward;
+                m_previewUtility.camera.allowHDR = false;
+                m_previewUtility.camera.clearFlags = CameraClearFlags.Skybox;
+                m_previewUtility.lights[0].shadows = LightShadows.None;
+            }
+
+            if(m_Renderers == null)
+            {
+                m_Renderers = new List<VolumeRendererBase>();
+                m_Renderers.Add(new DensityVolumeRenderer());
+                m_Renderers.Add(new VectorFieldVolumeRenderer());
+                m_ActiveRenderer = m_Renderers[0];
+            }
+
+            if(m_DummyRenderer == null)
+            {
+                m_DummyRenderer = new DummyRenderer();
+            }
+        }
+
+        public void LoadTexture(string path)
+        {
+            Texture3D texture = AssetDatabase.LoadAssetAtPath<Texture3D>(path);
+            if(texture != null)
+            {
+                m_Volume = texture;
+                m_ActiveRenderer.SetTexture(m_Volume);
+            }
+        }
+
+        public void OnRendererGUI()
+        {
+            Initialize();
+            m_ActiveRenderer.OnGUI();
+        }
+
+        private void UpdateCamera()
+        {
+            Vector3 pos = new Vector3( Mathf.Sin(m_CameraPhi)* Mathf.Cos(m_CameraTheta), Mathf.Cos(m_CameraPhi), Mathf.Sin(m_CameraPhi) * Mathf.Sin(m_CameraTheta)) * m_CameraDistance;
+            m_previewUtility.camera.transform.position = pos;
+            m_previewUtility.camera.transform.LookAt(Vector3.zero);
+        }
+
+        public void HandleMouse(Rect Viewport)
+        {
+            if(Event.current.type == EventType.MouseDown)
+            {
+                if (Event.current.button == 0)
+                    m_NavMode = NavMode.Rotating;
+                else if (Event.current.button == 1)
+                    m_NavMode = NavMode.Zooming;
+
+                m_PreviousMousePosition = Event.current.mousePosition;
+            }
+            if (Event.current.type == EventType.MouseUp || Event.current.rawType == EventType.MouseUp)
+                m_NavMode = NavMode.None;
+
+            if(m_NavMode != NavMode.None)
+            {
+                Vector2 mouseDelta = Event.current.mousePosition - m_PreviousMousePosition;
+                switch(m_NavMode)
+                {
+                    case NavMode.Rotating:
+                        m_CameraTheta = (m_CameraTheta - mouseDelta.x * 0.003f) % (Mathf.PI * 2);
+                        m_CameraPhi = Mathf.Clamp(m_CameraPhi - mouseDelta.y *0.003f, 0.2f, Mathf.PI - 0.2f);
+                        break;
+                    case NavMode.Zooming:
+                        m_CameraDistance = Mathf.Clamp(mouseDelta.y * 0.01f + m_CameraDistance, 1, 10);
+                        break;
+                }
+            }
+
+            m_PreviousMousePosition = Event.current.mousePosition;
+        }
+
+        public void Render(Rect viewportRect)
+        {
+            Initialize();
+
+            UpdateCamera();
+            Material backupSkybox = RenderSettings.skybox;
+            RenderSettings.skybox = m_BackgroundMaterial;
+            m_previewUtility.BeginPreview(viewportRect, GUIStyle.none);
+            
+            if(m_Volume != null)
+            {
+                m_ActiveRenderer.Render(m_previewUtility);
+            }
+            else
+            {
+                m_DummyRenderer.Render(m_previewUtility);
+            }
+
+            m_previewUtility.camera.Render();
+            m_PreviewTexture = m_previewUtility.EndPreview();
+
+            RenderSettings.skybox = backupSkybox;
+        }
+
+        public int GetPreviewMode()
+        {
+            return m_Renderers.IndexOf(m_ActiveRenderer);
+        }
+
+        public void SetPreviewMode(int mode)
+        {
+            if(mode != m_Renderers.IndexOf(m_ActiveRenderer))
+            {
+                m_ActiveRenderer = m_Renderers[mode];
+                if(m_Volume != null)
+                    m_ActiveRenderer.SetTexture(m_Volume);
+            }
+        }
+
+        public string[] GetRendererNames()
+        {
+            string[] names = new string[m_Renderers.Count];
+            for(int i =0; i < m_Renderers.Count; i++)
+            {
+                names[i] = m_Renderers[i].ToString();
+            }
+            return names;
+        }
+
+        public int[] GetRendererValues()
+        {
+            int[] values = new int[m_Renderers.Count];
+            for(int i =0; i < m_Renderers.Count; i++)
+            {
+                values[i] = i;
+            }
+            return values;
+        }
+    }
+}

com.unity.vfx-toolbox/VolumeEditor/Editor/VolumeEditorPreview.cs.meta

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