protected void Erosion(EditHelper editSession, int brushSize, int erodeFaces, int erodeRec, int fillFaces, int fillRec, Level level, BlockCoordinates targetBlock)
{
double brushSizeSquared = brushSize * brushSize;
int tx = targetBlock.X;
int ty = targetBlock.Y;
int tz = targetBlock.Z;
BlockBuffer buffer1 = new BlockBuffer();
BlockBuffer buffer2 = new BlockBuffer();
for (int x = -brushSize - 1; x <= brushSize + 1; x++)
{
int x0 = x + tx;
for (int y = -brushSize - 1; y <= brushSize + 1; y++)
{
int y0 = y + ty;
for (int z = -brushSize - 1; z <= brushSize + 1; z++)
{
int z0 = z + tz;
var block = level.GetBlock(new BlockCoordinates(x0, y0, z0));
buffer1[new BlockCoordinates(x, y, z)] = block;
buffer2[new BlockCoordinates(x, y, z)] = block;
}
}
}
int swap = 0;
for (int i = 0; i < erodeRec; ++i)
{
ErosionIteration(brushSize, erodeFaces, swap % 2 == 0 ? buffer1 : buffer2, swap % 2 == 1 ? buffer1 : buffer2);
swap++;
}
for (int i = 0; i < fillRec; ++i)
{
FillIteration(brushSize, fillFaces, swap % 2 == 0 ? buffer1 : buffer2, swap % 2 == 1 ? buffer1 : buffer2);
swap++;
}
BlockBuffer finalBuffer = swap % 2 == 0 ? buffer1 : buffer2;
// apply the buffer to the world
for (int x = -brushSize; x <= brushSize; x++)
{
int x0 = x + tx;
for (int y = -brushSize; y <= brushSize; y++)
{
int y0 = y + ty;
for (int z = -brushSize; z <= brushSize; z++)
{
int z0 = z + tz;
var coord = new BlockCoordinates(x, y, z);
if (x * x + y * y + z * z <= brushSizeSquared && finalBuffer.ContainsKey(coord))
{
var block = finalBuffer[coord];
block.Coordinates = new BlockCoordinates(x0, y0, z0);
Block old = level.GetBlock(block.Coordinates);
if (block.Id == old.Id && block.Metadata == old.Metadata)
{
continue;
}
editSession.SetBlock(block);
}
}
}
}
}
