Adding multi-mesh SDF script.

Takes arbitrary skinned meshes, bakes out one combined and 3D scaled SDF.

Author: rorygames

MeshToSDF.unitypackage

@@ -1,7 +1,7 @@
 using System.Collections;
 using System.Collections.Generic;
 using UnityEngine;
-using UnityEngine.Experimental.VFX;
+using UnityEngine.VFX;
 
 [ExecuteAlways]
 public class MeshToSDF : MonoBehaviour
@@ -38,15 +38,14 @@ public class MeshToSDF : MonoBehaviour
     public int sdfResolution = 64;
 
     [Tooltip("Offset the mesh before voxelization")]
-    public Vector3 offset;
+    public Vector3 offset = new Vector3(0.5f,0.5f,0.5f);
     [Tooltip("Scale the mesh before voxelization")]
-    public float scaleBy = 1.0f;
+    public Vector3 scaleBy = Vector3.one;
     [Tooltip("Number of points to sample on each triangle when voxeling")]
     public uint samplesPerTriangle = 10;
     [Tooltip("Thicken the signed distance field by this amount")]
     public float postProcessThickness = 0.01f;
 
-
     Mesh prevMesh;
 
     // kernel ids
@@ -178,7 +177,7 @@ private Vector3 Div(Vector3 a, Vector3 b) {
     }
 
     public RenderTexture MeshToVoxel(int voxelResolution, Mesh mesh,
-        Vector3 offset, float scaleMeshBy, uint numSamplesPerTriangle, 
+        Vector3 offset, Vector3 scaleMeshBy, uint numSamplesPerTriangle, 
         RenderTexture voxels = null) {
         var indicies = mesh.triangles;
         var numIdxes = indicies.Length;
@@ -201,7 +200,7 @@ public RenderTexture MeshToVoxel(int voxelResolution, Mesh mesh,
         MtVImplementation.SetInt("tris", numTris);
         MtVImplementation.SetFloats("offset", offset.x, offset.y, offset.z);
         MtVImplementation.SetInt("numSamples", (int)numSamplesPerTriangle);
-        MtVImplementation.SetFloat("scale", scaleMeshBy);
+        MtVImplementation.SetVector("scale3d", scaleMeshBy);
         MtVImplementation.SetInt("voxelSide", (int)voxelResolution);
 
         if(voxels == null) {

MeshToSDF/MeshToSDF.cs

@@ -43,19 +43,20 @@ MonoBehaviour:
   m_Script: {fileID: 11500000, guid: 9045d133f640d214cbce5e5af2b582bd, type: 3}
   m_Name: 
   m_EditorClassIdentifier: 
+  executeInEditMode: 1
   JFAImplementation: {fileID: 7200000, guid: 3c29260ac4ca05f4780f9a4c44f20268, type: 3}
   MtVImplementation: {fileID: 7200000, guid: 39d9f785515d9ba49a5753410e0020fb, type: 3}
   outputRenderTexture: {fileID: 0}
-  offsetTransform: {fileID: 0}
-  scaleTransform: {fileID: 0}
-  mesh: {fileID: 10208, guid: 0000000000000000e000000000000000, type: 0}
+  staticMesh: {fileID: 4493585093827132993, guid: 733b559a024179547b08373652d74704,
+    type: 3}
   skinnedMeshRenderer: {fileID: 0}
   materialOutput: {fileID: 2100000, guid: 92f7ad2f404ea904ba517bfd0b0d54ca, type: 2}
   materialProperty: _Texture3D
   vfxOutput: {fileID: 0}
   vfxProperty: Texture3D
+  fieldsChanged: 1
   sdfResolution: 64
   offset: {x: 0.5, y: 0.5, z: 0.5}
-  scaleBy: 0.5
+  scaleBy: {x: 1, y: 1, z: 1}
   samplesPerTriangle: 64
   postProcessThickness: 0.01

MeshToSDF/MeshToSDF.prefab

@@ -9,6 +9,7 @@ int numSamples;
 half scale;
 half3 offset;
 uint voxelSide;
+half3 scale3d;
 
 StructuredBuffer<half3> VertexBuffer;
 StructuredBuffer<int> IndexBuffer;
@@ -19,7 +20,6 @@ half2 plastic(half index) {
 	return half2(0.5 + frac(0.7548776662466927 * index), 0.5 + frac(0.5698402909980532 * index));
 }
 
-
 // sample num, triangle basis vectors
 half3 triangleSample(int n, half3 A, half3 B) {
 	half2 s = plastic(half(n));
@@ -38,9 +38,9 @@ void MeshToVoxel(uint3 id : SV_DispatchThreadID)
 {
 	uint triID = id.x * 3;
 	if (triID >= tris * 3) return;
-	half3 a = VertexBuffer[IndexBuffer[triID + 0]] * scale + offset;
-	half3 b = VertexBuffer[IndexBuffer[triID + 1]] * scale + offset;
-	half3 c = VertexBuffer[IndexBuffer[triID + 2]] * scale + offset;
+	half3 a = VertexBuffer[IndexBuffer[triID + 0]] * scale3d + offset;
+	half3 b = VertexBuffer[IndexBuffer[triID + 1]] * scale3d + offset;
+	half3 c = VertexBuffer[IndexBuffer[triID + 2]] * scale3d + offset;
 	half3 AB = b - a;
 	half3 AC = c - a;
 	half side = half(voxelSide);
@@ -49,7 +49,7 @@ void MeshToVoxel(uint3 id : SV_DispatchThreadID)
 		half2 s = half2(frac(0.7548776662466927 * i), frac(0.5698402909980532 * i));
 		s = s.x + s.y > 1.0 ? 1.0 - s : s;
 		half3 pointOnTri = a + s.x * AB + s.y * AC;
-		half3 scaled = pointOnTri * side;
+		half3 scaled = pointOnTri * (side);
 		uint3 voxelIdx = uint3(floor(scaled));
 		if (!(any(voxelIdx < 0) || any(voxelIdx >= voxelSide))) {
 			half distFromCenter = 1.0 - length(frac(scaled) - half3(0.5, 0.5, 0.5));