public override MarchPoint[] GeneratePoints(Vector3Int chunkPosition, int cubeSize)
{
DispatchPointsKernel(chunkPosition, cubeSize);
MarchPoint[] points = new MarchPoint[_pointsBufferSize];
_pointsBuffer.GetData(points);
return(points);
}
internal Vector3 Interpolate(MarchPoint point1, MarchPoint point2, float surfaceValue)
{
float lerp = (surfaceValue - point1.value) / (point2.value - point1.value);
Vector3 deltaPosition = point2.position - point1.position;
return(point1.position + deltaPosition * lerp);
// return (point1.Position + point2.Position) / 2;
}
internal MarchCube GenerateCube(MarchPoint[] points, Vector3Int id)
{
var cubePoints = new MarchPoint[8];
int x, y, z;
for (int i = 0; i < 8; i++)
{
x = i & 1;
z = (i & 2) >> 1;
y = (i & 4) >> 2;
int localXIndex = ((1 - x) & z) | (x & (1 - z));
int localYIndex = y;
int localZIndex = 1 - z;
cubePoints[i] = points[MatrixId2ArrayId(id.x + localXIndex, id.y + localYIndex, id.z + localZIndex, _constantBuffer.pointsPerChunk1D)];
}
return(new MarchCube {
points = cubePoints
});
}
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);
}
}
