void Start()
{
//Allows this camera to draw mesh procedurally.
PostRenderEvent.AddEvent(Camera.main, DrawMesh);
//There are 8 threads run per group so N must be divisible by 8.
if (N % 8 != 0)
{
throw new System.ArgumentException("N must be divisible be 8");
}
//Holds the voxel values, generated from perlin noise.
m_noiseBuffer = new ComputeBuffer(N * N * N, sizeof(float));
//Holds the normals of the voxels.
m_normalsBuffer = new RenderTexture(N, N, 0, RenderTextureFormat.ARGBHalf, RenderTextureReadWrite.Linear);
m_normalsBuffer.dimension = TextureDimension.Tex3D;
m_normalsBuffer.enableRandomWrite = true;
m_normalsBuffer.useMipMap = false;
m_normalsBuffer.volumeDepth = N;
m_normalsBuffer.Create();
//Holds the verts generated by the marching cubes.
m_meshBuffer = new ComputeBuffer(SIZE, sizeof(float) * 7);
//These two buffers are just some settings needed by the marching cubes.
m_cubeEdgeFlags = new ComputeBuffer(256, sizeof(int));
m_cubeEdgeFlags.SetData(MarchingCubesTables.CubeEdgeFlags);
m_triangleConnectionTable = new ComputeBuffer(256 * 16, sizeof(int));
m_triangleConnectionTable.SetData(MarchingCubesTables.TriangleConnectionTable);
//Make the perlin noise, make sure to load resources to match shader used.
perlin = new GPUPerlinNoise(m_seed);
perlin.LoadResourcesFor4DNoise();
}
void OnDestroy()
{
//MUST release buffers.
m_noiseBuffer.Release();
m_meshBuffer.Release();
m_cubeEdgeFlags.Release();
m_triangleConnectionTable.Release();
m_normalsBuffer.Release();
PostRenderEvent.RemoveEvent(Camera.main, DrawMesh);
}
public static void RemoveEvent(Camera camera, CameraEventHandler onPostRenderEvent)
{
if (camera == null)
{
return;
}
PostRenderEvent e = camera.GetComponent <PostRenderEvent>();
if (e != null)
{
e.OnEvent -= onPostRenderEvent;
}
}
void Start()
{
//Allows this camera to draw mesh procedurally.
PostRenderEvent.AddEvent(Camera.main, DrawMesh);
//There are 8 threads run per group so N must be divisible by 8.
if (N % 8 != 0)
{
throw new System.ArgumentException("N must be divisible be 8");
}
//Holds the voxel values, generated from perlin noise.
m_noiseBuffer = new ComputeBuffer(N * N * N, sizeof(float));
//Holds the normals of the voxels.
m_normalsBuffer = new RenderTexture(N, N, 0, RenderTextureFormat.ARGBHalf, RenderTextureReadWrite.Linear);
m_normalsBuffer.dimension = TextureDimension.Tex3D;
m_normalsBuffer.enableRandomWrite = true;
m_normalsBuffer.useMipMap = false;
m_normalsBuffer.volumeDepth = N;
m_normalsBuffer.Create();
//Holds the verts generated by the marching cubes.
m_meshBuffer = new ComputeBuffer(SIZE, sizeof(float) * 7);
//Clear the mesh verts to -1. See the TriangleConnectionTable.
//Only verts that get generated will then have a value of 1.
//Only required if reading back the mesh.
//Could also use the ClearMesh compute shader provided.
float[] val = new float[SIZE * 7];
for (int i = 0; i < SIZE * 7; i++)
{
val[i] = -1.0f;
}
m_meshBuffer.SetData(val);
//These two buffers are just some settings needed by the marching cubes.
m_cubeEdgeFlags = new ComputeBuffer(256, sizeof(int));
m_cubeEdgeFlags.SetData(MarchingCubesTables.CubeEdgeFlags);
m_triangleConnectionTable = new ComputeBuffer(256 * 16, sizeof(int));
m_triangleConnectionTable.SetData(MarchingCubesTables.TriangleConnectionTable);
//Make the perlin noise, make sure to load resources to match shader used.
perlin = new GPUPerlinNoise(m_seed);
perlin.LoadResourcesFor3DNoise();
//Make the voxels.
m_perlinNoise.SetInt("_Width", N);
m_perlinNoise.SetInt("_Height", N);
m_perlinNoise.SetFloat("_Frequency", 0.02f);
m_perlinNoise.SetFloat("_Lacunarity", 2.0f);
m_perlinNoise.SetFloat("_Gain", 0.5f);
m_perlinNoise.SetTexture(0, "_PermTable2D", perlin.PermutationTable2D);
m_perlinNoise.SetTexture(0, "_Gradient3D", perlin.Gradient3D);
m_perlinNoise.SetBuffer(0, "_Result", m_noiseBuffer);
m_perlinNoise.Dispatch(0, N / 8, N / 8, N / 8);
//Make the voxel normals.
m_normals.SetInt("_Width", N);
m_normals.SetInt("_Height", N);
m_normals.SetBuffer(0, "_Noise", m_noiseBuffer);
m_normals.SetTexture(0, "_Result", m_normalsBuffer);
m_normals.Dispatch(0, N / 8, N / 8, N / 8);
//Make the mesh verts
m_marchingCubes.SetInt("_Width", N);
m_marchingCubes.SetInt("_Height", N);
m_marchingCubes.SetInt("_Depth", N);
m_marchingCubes.SetInt("_Border", 1);
m_marchingCubes.SetFloat("_Target", 0.0f);
m_marchingCubes.SetBuffer(0, "_Voxels", m_noiseBuffer);
m_marchingCubes.SetTexture(0, "_Normals", m_normalsBuffer);
m_marchingCubes.SetBuffer(0, "_Buffer", m_meshBuffer);
m_marchingCubes.SetBuffer(0, "_CubeEdgeFlags", m_cubeEdgeFlags);
m_marchingCubes.SetBuffer(0, "_TriangleConnectionTable", m_triangleConnectionTable);
m_marchingCubes.Dispatch(0, N / 8, N / 8, N / 8);
//Reads back the mesh data from the GPU and turns it into a standard unity mesh.
//ReadBackMesh(m_meshBuffer);
}
