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133 行
3.9 KiB

using System;
using UnityEngine.Rendering;
namespace UnityEngine.Experimental.Rendering.HDPipeline
{
[Serializable]
public struct DensityVolumeParameters
{
public Color albedo; // Single scattering albedo [0, 1]. Alpha is ignored
public float meanFreePath; // In meters [1, inf]. Should be chromatic - this is an optimization!
public float asymmetry; // Only used if (isLocal == false)
public Texture3D volumeMask;
public int textureIndex;
public Vector3 textureScrollingSpeed;
public Vector3 textureTiling;
private Vector3 volumeScrollingAmount;
public DensityVolumeParameters(Color color, float _meanFreePath, float _asymmetry)
{
albedo = color;
meanFreePath = _meanFreePath;
asymmetry = _asymmetry;
volumeMask = null;
textureIndex = -1;
textureScrollingSpeed = Vector3.zero;
textureTiling = Vector3.one;
volumeScrollingAmount = textureScrollingSpeed;
}
public void Update(bool animate, float time)
{
//Update scrolling based on deltaTime
if (volumeMask != null)
{
float animationTime = animate ? time : 0.0f;
volumeScrollingAmount = (textureScrollingSpeed * animationTime);
}
}
public void Constrain()
{
albedo.r = Mathf.Clamp01(albedo.r);
albedo.g = Mathf.Clamp01(albedo.g);
albedo.b = Mathf.Clamp01(albedo.b);
albedo.a = 1.0f;
meanFreePath = Mathf.Clamp(meanFreePath, 1.0f, float.MaxValue);
asymmetry = Mathf.Clamp(asymmetry, -1.0f, 1.0f);
volumeScrollingAmount = Vector3.zero;
}
public DensityVolumeData GetData()
{
DensityVolumeData data = new DensityVolumeData();
data.extinction = VolumeRenderingUtils.ExtinctionFromMeanFreePath(meanFreePath);
data.scattering = VolumeRenderingUtils.ScatteringFromExtinctionAndAlbedo(data.extinction, (Vector3)(Vector4)albedo);
data.textureIndex = textureIndex;
data.textureScroll = volumeScrollingAmount;
data.textureTiling = textureTiling;
return data;
}
} // class DensityVolumeParameters
[ExecuteInEditMode]
[AddComponentMenu("Rendering/Density Volume", 1100)]
public class DensityVolume : MonoBehaviour
{
public DensityVolumeParameters parameters = new DensityVolumeParameters(Color.grey, 10.0f, 0.0f);
private Texture3D previousVolumeMask = null;
public Action OnTextureUpdated;
//Gather and Update any parameters that may have changed
public void PrepareParameters(bool animate, float time)
{
//Texture has been updated notify the manager
if (previousVolumeMask != parameters.volumeMask)
{
NotifyUpdatedTexure();
previousVolumeMask = parameters.volumeMask;
}
parameters.Update(animate, time);
}
private void NotifyUpdatedTexure()
{
if (OnTextureUpdated != null)
{
OnTextureUpdated();
}
}
private void Awake()
{
}
private void OnEnable()
{
DensityVolumeManager.manager.RegisterVolume(this);
}
private void OnDisable()
{
DensityVolumeManager.manager.DeRegisterVolume(this);
}
private void Update()
{
}
private void OnValidate()
{
parameters.Constrain();
}
void OnDrawGizmos()
{
Gizmos.color = parameters.albedo;
Gizmos.matrix = transform.localToWorldMatrix;
Gizmos.DrawWireCube(Vector3.zero, Vector3.one);
}
}
} // UnityEngine.Experimental.Rendering.HDPipeline