AR Foundation演示项目,使用 AR Foundation 4.1.7 并围绕某些功能演示更高级功能。
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using System.Collections.Generic;
using UnityEngine;
using UnityEngine.XR.ARFoundation;
/// <summary>
/// This plane visualizer demonstrates the use of a feathering effect
/// at the edge of the detected plane, which reduces the visual impression
/// of a hard edge.
/// </summary>
[RequireComponent(typeof(ARPlaneMeshVisualizer), typeof(MeshRenderer), typeof(ARPlane))]
public class ARFeatheredPlaneMeshVisualizer : MonoBehaviour
{
[Tooltip("The width of the texture feathering (in world units).")]
[SerializeField]
float m_FeatheringWidth = 0.2f;
/// <summary>
/// The width of the texture feathering (in world units).
/// </summary>
public float featheringWidth
{
get { return m_FeatheringWidth; }
set { m_FeatheringWidth = value; }
}
void Awake()
{
m_PlaneMeshVisualizer = GetComponent<ARPlaneMeshVisualizer>();
m_FeatheredPlaneMaterial = GetComponent<MeshRenderer>().material;
m_Plane = GetComponent<ARPlane>();
}
void OnEnable()
{
m_Plane.boundaryChanged += ARPlane_boundaryUpdated;
}
void OnDisable()
{
m_Plane.boundaryChanged -= ARPlane_boundaryUpdated;
}
void ARPlane_boundaryUpdated(ARPlaneBoundaryChangedEventArgs eventArgs)
{
GenerateBoundaryUVs(m_PlaneMeshVisualizer.mesh);
}
/// <summary>
/// Generate UV2s to mark the boundary vertices and feathering UV coords.
/// </summary>
/// <remarks>
/// The <c>ARPlaneMeshVisualizer</c> has a <c>meshUpdated</c> event that can be used to modify the generated
/// mesh. In this case we'll add UV2s to mark the boundary vertices.
/// This technique avoids having to generate extra vertices for the boundary. It works best when the plane is
/// is fairly uniform.
/// </remarks>
/// <param name="mesh">The <c>Mesh</c> generated by <c>ARPlaneMeshVisualizer</c></param>
void GenerateBoundaryUVs(Mesh mesh)
{
int vertexCount = mesh.vertexCount;
// Reuse the list of UVs
s_FeatheringUVs.Clear();
if (s_FeatheringUVs.Capacity < vertexCount) { s_FeatheringUVs.Capacity = vertexCount; }
mesh.GetVertices(s_Vertices);
Vector3 centerInPlaneSpace = s_Vertices[s_Vertices.Count - 1];
Vector3 uv = new Vector3(0, 0, 0);
float shortestUVMapping = float.MaxValue;
// Assume the last vertex is the center vertex.
for (int i = 0; i < vertexCount - 1; i++)
{
float vertexDist = Vector3.Distance(s_Vertices[i], centerInPlaneSpace);
// Remap the UV so that a UV of "1" marks the feathering boudary.
// The ratio of featherBoundaryDistance/edgeDistance is the same as featherUV/edgeUV.
// Rearrange to get the edge UV.
float uvMapping = vertexDist / Mathf.Max(vertexDist - featheringWidth, 0.001f);
uv.x = uvMapping;
// All the UV mappings will be different. In the shader we need to know the UV value we need to fade out by.
// Choose the shortest UV to guarentee we fade out before the border.
// This means the feathering widths will be slightly different, we again rely on a fairly uniform plane.
if (shortestUVMapping > uvMapping) { shortestUVMapping = uvMapping; }
s_FeatheringUVs.Add(uv);
}
m_FeatheredPlaneMaterial.SetFloat("_ShortestUVMapping", shortestUVMapping);
// Add the center vertex UV
uv.Set(0, 0, 0);
s_FeatheringUVs.Add(uv);
mesh.SetUVs(1, s_FeatheringUVs);
mesh.UploadMeshData(false);
}
static List<Vector3> s_FeatheringUVs = new List<Vector3>();
static List<Vector3> s_Vertices = new List<Vector3>();
ARPlaneMeshVisualizer m_PlaneMeshVisualizer;
ARPlane m_Plane;
Material m_FeatheredPlaneMaterial;
}