Update voxelizing flow. (Fill front surface before back surface)

Author: mattatz

Assets/Packages/Voxelizer/Demo/Materials/VoxelWave.mat

@@ -69,9 +69,11 @@ Material:
  - _SmoothnessTextureChannel: 0
  - _SpecularHighlights: 1
  - _SrcBlend: 1
+ - _Threshold: 0
  - _UVSec: 0
  - _ZWrite: 1
  m_Colors:
  - _Color: {r: 1, g: 1, b: 1, a: 1}
  - _EmissionColor: {r: 0, g: 0, b: 0, a: 1}
+ - _Range: {r: -10, g: 10, b: 0, a: 0}
  - _Wave: {r: 9.72, g: 0.012, b: -1, a: -1}

Assets/Packages/Voxelizer/Scripts/CPUVoxelizer.cs

@@ -154,7 +154,7 @@ public static void Voxelize (Mesh mesh, int resolution, out List<Voxel_t> voxels
  {
  for(int z = 0; z < depth; z++)
  {
- if (volume[x, y, z].IsCavity()) continue;
+ if (volume[x, y, z].IsEmpty()) continue;
 
  int ifront = z;
 
@@ -171,7 +171,7 @@ public static void Voxelize (Mesh mesh, int resolution, out List<Voxel_t> voxels
  var iback = ifront;
 
  // step forward to cavity
- for (; iback < depth && volume[x, y, iback].IsCavity(); iback++) {}
+ for (; iback < depth && volume[x, y, iback].IsEmpty(); iback++) {}
 
  if (iback >= depth) break;
 
@@ -201,7 +201,7 @@ public static void Voxelize (Mesh mesh, int resolution, out List<Voxel_t> voxels
  for(int x = 0; x < width; x++) {
  for(int y = 0; y < height; y++) {
  for(int z = 0; z < depth; z++) {
- if(!volume[x, y, z].IsCavity())
+ if(!volume[x, y, z].IsEmpty())
  {
  voxels.Add(volume[x, y, z]);
  }

Assets/Packages/Voxelizer/Scripts/GPUVoxelizer.cs

@@ -11,7 +11,7 @@ namespace VoxelSystem {
 
 public class GPUVoxelizer {
 
-protected const string kVolumeKernelKey = "Volume", kSurfaceKernelKey = "Surface", kTextureKernelKey = "BuildTexture3D";
+protected const string kVolumeKernelKey = "Volume", kSurfaceFrontKernelKey = "SurfaceFront", kSurfaceBackKernelKey = "SurfaceBack", kTextureKernelKey = "BuildTexture3D";
 protected const string kStartKey = "_Start", kEndKey = "_End", kSizeKey = "_Size";
 protected const string kUnitKey = "_Unit", kInvUnitKey = "_InvUnit", kHalfUnitKey = "_HalfUnit";
 protected const string kWidthKey = "_Width", kHeightKey = "_Height", kDepthKey = "_Depth";
@@ -88,21 +88,31 @@ public static GPUVoxelData Voxelize(ComputeShader voxelizer, Mesh mesh, Bounds b
 voxelizer.SetInt(kDepthKey, d);
 
 // send mesh data
-var surfaceKer = new Kernel(voxelizer, kSurfaceKernelKey);
-voxelizer.SetBuffer(surfaceKer.Index, kVertBufferKey, vertBuffer);
-voxelizer.SetBuffer(surfaceKer.Index, kUVBufferKey, uvBuffer);
 voxelizer.SetInt(kTriCountKey, triBuffer.count);
  var indexes = triBuffer.count / 3;
 voxelizer.SetInt(kTriIndexesKey, indexes);
-voxelizer.SetBuffer(surfaceKer.Index, kTriBufferKey, triBuffer);
-voxelizer.SetBuffer(surfaceKer.Index, kVoxelBufferKey, voxelBuffer);
-voxelizer.Dispatch(surfaceKer.Index, indexes / (int)surfaceKer.ThreadX + 1, (int)surfaceKer.ThreadY, (int)surfaceKer.ThreadZ);
+
+ // surface front
+var surfaceFrontKer = new Kernel(voxelizer, kSurfaceFrontKernelKey);
+voxelizer.SetBuffer(surfaceFrontKer.Index, kVertBufferKey, vertBuffer);
+voxelizer.SetBuffer(surfaceFrontKer.Index, kUVBufferKey, uvBuffer);
+voxelizer.SetBuffer(surfaceFrontKer.Index, kTriBufferKey, triBuffer);
+voxelizer.SetBuffer(surfaceFrontKer.Index, kVoxelBufferKey, voxelBuffer);
+voxelizer.Dispatch(surfaceFrontKer.Index, indexes / (int)surfaceFrontKer.ThreadX + 1, (int)surfaceFrontKer.ThreadY, (int)surfaceFrontKer.ThreadZ);
+
+ // surface back
+var surfaceBackKer = new Kernel(voxelizer, kSurfaceBackKernelKey);
+voxelizer.SetBuffer(surfaceBackKer.Index, kVertBufferKey, vertBuffer);
+voxelizer.SetBuffer(surfaceBackKer.Index, kUVBufferKey, uvBuffer);
+voxelizer.SetBuffer(surfaceBackKer.Index, kTriBufferKey, triBuffer);
+voxelizer.SetBuffer(surfaceBackKer.Index, kVoxelBufferKey, voxelBuffer);
+voxelizer.Dispatch(surfaceBackKer.Index, indexes / (int)surfaceBackKer.ThreadX + 1, (int)surfaceBackKer.ThreadY, (int)surfaceBackKer.ThreadZ);
 
  if(volume)
  {
  var volumeKer = new Kernel(voxelizer, kVolumeKernelKey);
  voxelizer.SetBuffer(volumeKer.Index, kVoxelBufferKey, voxelBuffer);
- voxelizer.Dispatch(volumeKer.Index, w / (int)volumeKer.ThreadX + 1, h / (int)volumeKer.ThreadY + 1, (int)surfaceKer.ThreadZ);
+ voxelizer.Dispatch(volumeKer.Index, w / (int)volumeKer.ThreadX + 1, h / (int)volumeKer.ThreadY + 1, (int)surfaceFrontKer.ThreadZ);
  }
 
 // dispose

Assets/Packages/Voxelizer/Scripts/Voxel.cs

@@ -25,7 +25,7 @@ public bool IsBackFace()
  return fill > 0 && front > 0;
  }
 
- public bool IsCavity()
+ public bool IsEmpty()
  {
  return fill < 1;
  }

Assets/Packages/Voxelizer/Shaders/Voxel.cginc

@@ -18,7 +18,7 @@ bool is_back_voxel(Voxel v)
  return v.fill && !v.front;
 }
 
-bool is_cavity_voxel(Voxel v)
+bool is_empty_voxel(Voxel v)
 {
  return !v.fill;
 }