//Get the voxel gradient at a specific 3D point
public float3 CalculateVoxelGradient(float3 point)
{
float3 normal = new Vector3();
normal.x = MarchingCubeHelper.Density(point + new float3(1, 0, 0), terrainGenerationData) - MarchingCubeHelper.Density(point - new float3(1, 0, 0), terrainGenerationData);
normal.y = MarchingCubeHelper.Density(point + new float3(0, 1, 0), terrainGenerationData) - MarchingCubeHelper.Density(point - new float3(0, 1, 0), terrainGenerationData);
normal.z = MarchingCubeHelper.Density(point + new float3(0, 0, 1), terrainGenerationData) - MarchingCubeHelper.Density(point - new float3(0, 0, 1), terrainGenerationData);
return(normal);
}
//Get the voxel gradient using the voxel grid
public float3 CalculateVoxelGradientFromGrid(float3 point)
{
float3 normal = new Vector3();
normal.x = voxels[MarchingCubeHelper.VoxelToArr(point + new float3(1, 0, 0), resolution + 2)] - voxels[MarchingCubeHelper.VoxelToArr(point - new float3(1, 0, 0), resolution + 2)];
normal.y = voxels[MarchingCubeHelper.VoxelToArr(point + new float3(0, 1, 0), resolution + 2)] - voxels[MarchingCubeHelper.VoxelToArr(point - new float3(0, 1, 0), resolution + 2)];
normal.z = voxels[MarchingCubeHelper.VoxelToArr(point + new float3(0, 0, 1), resolution + 2)] - voxels[MarchingCubeHelper.VoxelToArr(point - new float3(0, 0, 1), resolution + 2)];
return(normal);
}
// Start is called before the first frame update
void Start()
{
int index = 0;
for (int y = 0; y < 2; y++)
{
for (int z = 0; z < 2; z++)
{
for (int x = 0; x < 2; x++)
{
Debug.Log("Real: " + new float3(x, y, z) + " Estimate: " + MarchingCubeHelper.ArrToVoxel(MarchingCubeHelper.VoxelToArr(new float3(x, y, z), 2), 2));
index++;
}
}
}
}
//Generate mesh
public void Execute(int index)
{
float3 pos = MarchingCubeHelper.ArrToVoxel(index, resolution);
int caseNum = 0;
if (!terrainGenerationData.usePregeneratedVoxelData)
{
caseNum += ((MarchingCubeHelper.Density(scale * (pos) + chunkPosition, terrainGenerationData) < 0) ? 1 : 0);
caseNum += ((MarchingCubeHelper.Density(scale * (pos + new float3(0, 1, 0)) + chunkPosition, terrainGenerationData) < 0) ? 1 : 0) * 2;
caseNum += ((MarchingCubeHelper.Density(scale * (pos + new float3(1, 1, 0)) + chunkPosition, terrainGenerationData) < 0) ? 1 : 0) * 4;
caseNum += ((MarchingCubeHelper.Density(scale * (pos + new float3(1, 0, 0)) + chunkPosition, terrainGenerationData) < 0) ? 1 : 0) * 8;
caseNum += ((MarchingCubeHelper.Density(scale * (pos + new float3(0, 0, 1)) + chunkPosition, terrainGenerationData) < 0) ? 1 : 0) * 16;
caseNum += ((MarchingCubeHelper.Density(scale * (pos + new float3(0, 1, 1)) + chunkPosition, terrainGenerationData) < 0) ? 1 : 0) * 32;
caseNum += ((MarchingCubeHelper.Density(scale * (pos + new float3(1, 1, 1)) + chunkPosition, terrainGenerationData) < 0) ? 1 : 0) * 64;
caseNum += ((MarchingCubeHelper.Density(scale * (pos + new float3(1, 0, 1)) + chunkPosition, terrainGenerationData) < 0) ? 1 : 0) * 128;
}
else
{
//pos += new float3(1, 1, 1);
caseNum += ((voxels[MarchingCubeHelper.VoxelToArr((pos), resolution + 2)] < 0) ? 1 : 0);
caseNum += ((voxels[MarchingCubeHelper.VoxelToArr((pos + new float3(0, 1, 0)), resolution + 2)] < 0) ? 1 : 0) * 2;
caseNum += ((voxels[MarchingCubeHelper.VoxelToArr((pos + new float3(1, 1, 0)), resolution + 2)] < 0) ? 1 : 0) * 4;
caseNum += ((voxels[MarchingCubeHelper.VoxelToArr((pos + new float3(1, 0, 0)), resolution + 2)] < 0) ? 1 : 0) * 8;
caseNum += ((voxels[MarchingCubeHelper.VoxelToArr((pos + new float3(0, 0, 1)), resolution + 2)] < 0) ? 1 : 0) * 16;
caseNum += ((voxels[MarchingCubeHelper.VoxelToArr((pos + new float3(0, 1, 1)), resolution + 2)] < 0) ? 1 : 0) * 32;
caseNum += ((voxels[MarchingCubeHelper.VoxelToArr((pos + new float3(1, 1, 1)), resolution + 2)] < 0) ? 1 : 0) * 64;
caseNum += ((voxels[MarchingCubeHelper.VoxelToArr((pos + new float3(1, 0, 1)), resolution + 2)] < 0) ? 1 : 0) * 128;
}
int currentTriangleIndex;
NativeList <int> trianglesTemp = new NativeList <int>(0, Allocator.Temp);
for (int i = 0; i < 16; i++)
{
currentTriangleIndex = triangulationTable[caseNum * 16 + i];
if (currentTriangleIndex != -1)
{
trianglesTemp.Add(currentTriangleIndex);//Make triangle face
triangles[index * 15 + i] = currentTriangleIndex + index * 12;
}
}
float3 vertex;
for (int i = 0; i < 12; i++)
{
if (trianglesTemp.Contains(i))
{
float3 gradient = CalculateVoxelGradientFromGrid(pos + new float3(1, 1, 1));
if (terrainGenerationData.interpolation)
{
//Use interpolation when placing the current vertex
float lerp = 0.5f;
if (terrainGenerationData.usePregeneratedVoxelData)
{
lerp = Mathf.InverseLerp(voxels[MarchingCubeHelper.VoxelToArr(edgeTable[i] + pos, resolution + 2)], voxels[MarchingCubeHelper.VoxelToArr(edgeTable2[i] + pos, resolution + 2)], 0);
vertex = (math.lerp(edgeTable[i], edgeTable2[i], lerp) + pos);
gradient = math.lerp(CalculateVoxelGradientFromGrid(edgeTable[i] + pos), CalculateVoxelGradientFromGrid(edgeTable2[i] + pos), lerp);
}
else
{
lerp = Mathf.InverseLerp(MarchingCubeHelper.Density(scale * (edgeTable[i] + pos) + chunkPosition, terrainGenerationData), MarchingCubeHelper.Density(scale * (edgeTable2[i] + pos) + chunkPosition, terrainGenerationData), 0);
vertex = (math.lerp(edgeTable[i], edgeTable2[i], lerp) + pos);
if (terrainGenerationData.useVertexPosAsGradientSource)
{
gradient = CalculateVoxelGradient(vertex * scale + chunkPosition);
}
}
//vertex = (math.lerp(edgeTable[i], edgeTable2[i], Mathf.InverseLerp(MarchingCubeHelper.Density(scale * (edgeTable[i] + pos) + chunkPosition, terrainGenerationData), MarchingCubeHelper.Density(scale * (edgeTable2[i] + pos) + chunkPosition, terrainGenerationData), 0)) + pos);
vertices[index * 12 + i] = vertex * scale;//Add vertex at correct position
colors[index * 12 + i] = MarchingCubeHelper.ColorDensity(vertex * scale + chunkPosition, gradient, terrainColorData);
}
else
{
//Do not use interpolation when placing the current vertex
vertex = (math.lerp(edgeTable[i], edgeTable2[i], 0.5f)) + pos;
if (terrainGenerationData.useVertexPosAsGradientSource && !terrainGenerationData.usePregeneratedVoxelData)
{
gradient = CalculateVoxelGradient(vertex * scale + chunkPosition);
}
vertices[index * 12 + i] = vertex * scale;
colors[index * 12 + i] = MarchingCubeHelper.ColorDensity(vertex * scale + chunkPosition, gradient, terrainColorData);
}
}
else
{
vertices[index * 12 + i] = -Vector3.one; //We dont need to make this unused vertex compute its position
colors[index * 12 + i] = Color.clear;
}
}
}
public void Execute(int index)
{
voxels[index] = MarchingCubeHelper.Density(scale * MarchingCubeHelper.ArrToVoxel(index, resolution) + chunkPosition - (new float3(1, 1, 1) * scale), terrainGenerationData);
}