// Creates bricks at the coarsest level for all areas that are overlapped by the pass in volume
private void Rasterize(Volume volume, List <Brick> outBricks)
{
Profiler.BeginSample("Rasterize");
// Calculate bounding box for volume in refvol space
var AABB = volume.CalculateAABB();
// Calculate smallest brick size capable of covering shortest AABB dimension
float minVolumeSize = Mathf.Min(AABB.size.x, Mathf.Min(AABB.size.y, AABB.size.z));
int brickSubDivLevel = Mathf.Min(Mathf.CeilToInt(Mathf.Log(minVolumeSize, 3)), m_MaxSubdivision);
int brickTotalSize = (int)Mathf.Pow(3, brickSubDivLevel);
// Extend AABB to have origin that lies on a grid point
AABB.Encapsulate(new Vector3(
brickTotalSize * Mathf.Floor(AABB.min.x / brickTotalSize),
brickTotalSize * Mathf.Floor(AABB.min.y / brickTotalSize),
brickTotalSize * Mathf.Floor(AABB.min.z / brickTotalSize)));
// Calculate origin of bricks and how many are needed to cover volume
Vector3Int origin = Vector3Int.FloorToInt(AABB.min);
Vector3 logicalBrickRes = Vector3Int.CeilToInt(AABB.size / brickTotalSize);
// Cover the volume with bricks
for (int x = 0; x < logicalBrickRes.x; x++)
{
for (int y = 0; y < logicalBrickRes.y; y++)
{
for (int z = 0; z < logicalBrickRes.z; z++)
{
Vector3Int pos = origin + new Vector3Int(x, y, z) * brickTotalSize;
outBricks.Add(new Brick(pos, brickSubDivLevel));
}
}
}
Profiler.EndSample();
}