/// <summary>
/// Generates the triangles for a specific voxel
/// </summary>
/// <param name="node">The node that contains the voxel</param>
/// <param name="pos">The voxel position (Not real position) [16,16,16]</param>
/// <param name="triangleList">The list used to contain triangles made so far</param>
/// <param name="densities">The array that contains density information</param>
/// <param name="densityNormals">The array that contains density normals</param>
private static void generateTriangles(Node node, Vector3I pos, List<Triangle> triangleList, List<int> submeshIDList, int[] subMeshTriCount, DensityData densities, Vector3[, ,] densityNormals)
{
float size = NodeManager.LODSize[node.LOD];
float[] denses = new float[8];
denses[0] = densities.get(pos.x, pos.y, pos.z + 1);
denses[1] = densities.get(pos.x + 1, pos.y, pos.z + 1);
denses[2] = densities.get(pos.x + 1, pos.y, pos.z);
denses[3] = densities.get(pos.x, pos.y, pos.z);
denses[4] = densities.get(pos.x, pos.y + 1, pos.z + 1);
denses[5] = densities.get(pos.x + 1, pos.y + 1, pos.z + 1);
denses[6] = densities.get(pos.x + 1, pos.y + 1, pos.z);
denses[7] = densities.get(pos.x, pos.y + 1, pos.z);
byte cubeIndex = 0;
if (denses[0] < isolevel)
cubeIndex |= 1;
if (denses[1] < isolevel)
cubeIndex |= 2;
if (denses[2] < isolevel)
cubeIndex |= 4;
if (denses[3] < isolevel)
cubeIndex |= 8;
if (denses[4] < isolevel)
cubeIndex |= 16;
if (denses[5] < isolevel)
cubeIndex |= 32;
if (denses[6] < isolevel)
cubeIndex |= 64;
if (denses[7] < isolevel)
cubeIndex |= 128;
if (cubeIndex == 0 || cubeIndex == 255)
return;
Vector3 origin = new Vector3((size * (pos.x))
, (size * (pos.y))
, (size * (pos.z)));
Vector3[] positions = new Vector3[8];
positions[0] = new Vector3(origin.x, origin.y, origin.z + size);
positions[1] = new Vector3(origin.x + size, origin.y, origin.z + size);
positions[2] = new Vector3(origin.x + size, origin.y, origin.z);
positions[3] = new Vector3(origin.x, origin.y, origin.z);
positions[4] = new Vector3(origin.x, origin.y + size, origin.z + size);
positions[5] = new Vector3(origin.x + size, origin.y + size, origin.z + size);
positions[6] = new Vector3(origin.x + size, origin.y + size, origin.z);
positions[7] = new Vector3(origin.x, origin.y + size, origin.z);
Vector3[][] vertlist = new Vector3[12][];
if (IsBitSet(edgeTable[cubeIndex], 1))
vertlist[0] = VertexInterp(isolevel, positions[0], positions[1], denses[0], denses[1], densityNormals[pos.x, pos.y, pos.z + 1], densityNormals[pos.x + 1, pos.y, pos.z + 1]);
if (IsBitSet(edgeTable[cubeIndex], 2))
vertlist[1] = VertexInterp(isolevel, positions[1], positions[2], denses[1], denses[2], densityNormals[pos.x + 1, pos.y, pos.z + 1], densityNormals[pos.x + 1, pos.y, pos.z]);
if (IsBitSet(edgeTable[cubeIndex], 4))
vertlist[2] = VertexInterp(isolevel, positions[2], positions[3], denses[2], denses[3], densityNormals[pos.x + 1, pos.y, pos.z], densityNormals[pos.x, pos.y, pos.z]);
if (IsBitSet(edgeTable[cubeIndex], 8))
vertlist[3] = VertexInterp(isolevel, positions[3], positions[0], denses[3], denses[0], densityNormals[pos.x, pos.y, pos.z], densityNormals[pos.x, pos.y, pos.z + 1]);
if (IsBitSet(edgeTable[cubeIndex], 16))
vertlist[4] = VertexInterp(isolevel, positions[4], positions[5], denses[4], denses[5], densityNormals[pos.x, pos.y + 1, pos.z + 1], densityNormals[pos.x + 1, pos.y + 1, pos.z + 1]);
if (IsBitSet(edgeTable[cubeIndex], 32))
vertlist[5] = VertexInterp(isolevel, positions[5], positions[6], denses[5], denses[6], densityNormals[pos.x + 1, pos.y + 1, pos.z + 1], densityNormals[pos.x + 1, pos.y + 1, pos.z]);
if (IsBitSet(edgeTable[cubeIndex], 64))
vertlist[6] = VertexInterp(isolevel, positions[6], positions[7], denses[6], denses[7], densityNormals[pos.x + 1, pos.y + 1, pos.z], densityNormals[pos.x, pos.y + 1, pos.z]);
if (IsBitSet(edgeTable[cubeIndex], 128))
vertlist[7] = VertexInterp(isolevel, positions[7], positions[4], denses[7], denses[4], densityNormals[pos.x, pos.y + 1, pos.z], densityNormals[pos.x, pos.y + 1, pos.z + 1]);
if (IsBitSet(edgeTable[cubeIndex], 256))
vertlist[8] = VertexInterp(isolevel, positions[0], positions[4], denses[0], denses[4], densityNormals[pos.x, pos.y, pos.z + 1], densityNormals[pos.x, pos.y + 1, pos.z + 1]);
if (IsBitSet(edgeTable[cubeIndex], 512))
vertlist[9] = VertexInterp(isolevel, positions[1], positions[5], denses[1], denses[5], densityNormals[pos.x + 1, pos.y, pos.z + 1], densityNormals[pos.x + 1, pos.y + 1, pos.z + 1]);
if (IsBitSet(edgeTable[cubeIndex], 1024))
vertlist[10] = VertexInterp(isolevel, positions[2], positions[6], denses[2], denses[6], densityNormals[pos.x + 1, pos.y, pos.z], densityNormals[pos.x + 1, pos.y + 1, pos.z]);
if (IsBitSet(edgeTable[cubeIndex], 2048))
vertlist[11] = VertexInterp(isolevel, positions[3], positions[7], denses[3], denses[7], densityNormals[pos.x, pos.y, pos.z], densityNormals[pos.x, pos.y + 1, pos.z]);
int submesh = densities.getMaterial(pos.x, pos.y, pos.z);
for (int i = 0; triTable[cubeIndex][i] != -1; i += 3)
{
submeshIDList.Add(submesh);
subMeshTriCount[submesh] = subMeshTriCount[submesh] + 1;
triangleList.Add(new Triangle(vertlist[triTable[cubeIndex][i]][0], vertlist[triTable[cubeIndex][i + 1]][0], vertlist[triTable[cubeIndex][i + 2]][0],
vertlist[triTable[cubeIndex][i]][1], vertlist[triTable[cubeIndex][i + 1]][1], vertlist[triTable[cubeIndex][i + 2]][1]));
}
}
/// <summary>
/// Calculates the normal.
/// </summary>
/// <param name="p"></param>
private static Vector3 calculateDensityNormal(Vector3I p, DensityData densities, int lod)
{
Vector3 normal = new Vector3();
normal.x = (densities.get(p.x + 1, p.y, p.z) - densities.get(p.x - 1, p.y, p.z)) / (NodeManager.LODSize[lod]);
normal.y = (densities.get(p.x, p.y + 1, p.z) - densities.get(p.x, p.y - 1, p.z)) / (NodeManager.LODSize[lod]);
normal.z = (densities.get(p.x, p.y, p.z + 1) - densities.get(p.x, p.y, p.z - 1)) / (NodeManager.LODSize[lod]);
normal.Normalize();
return normal;
}