internal int GetPointsHash(MarchCube cube, float surfaceValue)
{
int cubeIndex = 0;
// Find which vertices are inside of the surface and which are outside
for (int i = 0; i < 8; i++)
{
if (cube.points[i].value <= surfaceValue)
{
cubeIndex |= 1 << i;
}
}
return(cubeIndex);
}
internal void March(MarchCube cube, float surfaceValue, int cubeArrayId, ref TempMeshBuffer tempBuffer)
{
int pointsHash = GetPointsHash(cube, surfaceValue);
// Find which edges are intersected by the surface
int edgesHash = _constantBuffer.pointsHash2EdgesHash[pointsHash];
// If the cube is entirely inside or outside of the surface, then there will be no intersections
if (edgesHash == 0)
{
return;
}
// Save the triangles that were found. There can be up to five per cube
for (int i = 0; i < 5; i++)
{
if (_constantBuffer.pointsHash2EdgesIndexes[pointsHash, 3 * i] == 20.0f)
{
break;
}
var face = new Vector3[3];
for (int j = 0; j < 3; j++)
{
int edgeIndex = _constantBuffer.pointsHash2EdgesIndexes[pointsHash, 3 * i + j];
int edgePoint1Index = _constantBuffer.edgeIndex2PointIndexes[edgeIndex, 0];
int edgePoint2Index = _constantBuffer.edgeIndex2PointIndexes[edgeIndex, 1];
MarchPoint edgePoint1 = cube.points[edgePoint1Index];
MarchPoint edgePoint2 = cube.points[edgePoint2Index];
face[j] = Interpolate(edgePoint1, edgePoint2, surfaceValue);
}
AddFace(face, cubeArrayId, ref tempBuffer);
}
}