public void PreProcessChunks()
{
Profiler.BeginSample("PreProcessChunks");
// Recalculate camera frustum planes
Planes.CalculateFrustumPlanes(myCamera, cameraPlanes);
// Update clipmap based on range values
UpdateRanges();
// Update viewer position
UpdateViewerPosition();
OnPreProcessChunks();
Profiler.EndSample();
}
protected override void UpdateVisibility(int x, int y, int z, int rangeX, int rangeY, int rangeZ)
{
if (rangeX == 0 || rangeY == 0 || rangeZ == 0)
{
return;
}
Profiler.BeginSample("Cull");
bool isLast = rangeX == 1 && rangeY == 1 && rangeZ == 1;
int wx = x * Env.CHUNK_SIZE;
int wy = y * Env.CHUNK_SIZE;
int wz = z * Env.CHUNK_SIZE;
// Stop if there is no further subdivision possible
if (isLast)
{
Profiler.BeginSample("CullLast");
// Update chunk's visibility information
Vector3Int chunkPos = new Vector3Int(wx, wy, wz);
Chunk chunk = world.GetChunk(ref chunkPos);
if (chunk != null)
{
int tx = clipmap.TransformX(x);
int ty = clipmap.TransformY(y);
int tz = clipmap.TransformZ(z);
// Skip chunks which are too far away
if (clipmap.IsInsideBounds_Transformed(tx, ty, tz))
{
// Update visibility information
ClipmapItem item = clipmap.Get_Transformed(tx, ty, tz);
bool isVisible = Planes.TestPlanesAABB(cameraPlanes, ref chunk.worldBounds);
chunk.NeedsRenderGeometry = isVisible && item.isInVisibleRange;
chunk.PossiblyVisible = isVisible;
}
}
Profiler.EndSample(); // CullLast
Profiler.EndSample(); // Cull
return;
}
int rx = rangeX * Env.CHUNK_SIZE;
int ry = rangeY * Env.CHUNK_SIZE;
int rz = rangeZ * Env.CHUNK_SIZE;
// Check whether the bouding box lies inside the camera's frustum
AABB bounds2 = new AABB(wx, wy, wz, wx + rx, wy + ry, wz + rz);
Planes.TestPlanesResult res = Planes.TestPlanesAABB2(cameraPlanes, ref bounds2);
#region Full invisibility
// Everything is invisible by default
if (res == Planes.TestPlanesResult.Outside)
{
Profiler.EndSample(); // Cull
return;
}
#endregion
#region Full visibility
if (res == Planes.TestPlanesResult.Inside)
{
Profiler.BeginSample("CullFullInside");
// Full visibility. All chunks in this area need to be made visible
for (int cy = wy; cy < wy + ry; cy += Env.CHUNK_SIZE)
{
for (int cz = wz; cz < wz + rz; cz += Env.CHUNK_SIZE)
{
for (int cx = wx; cx < wx + rx; cx += Env.CHUNK_SIZE)
{
// Update chunk's visibility information
Vector3Int chunkPos = new Vector3Int(cx, cy, cz);
Chunk chunk = world.GetChunk(ref chunkPos);
if (chunk == null)
{
continue;
}
int tx = clipmap.TransformX(x);
int ty = clipmap.TransformY(y);
int tz = clipmap.TransformZ(z);
// Update visibility information
ClipmapItem item = clipmap.Get_Transformed(tx, ty, tz);
chunk.NeedsRenderGeometry = item.isInVisibleRange;
chunk.PossiblyVisible = true;
}
}
}
Profiler.EndSample(); // CullLast
Profiler.EndSample(); // Cull
return;
}
#endregion
#region Partial visibility
int offX = rangeX;
if (rangeX > 1)
{
offX = rangeX >> 1;
rangeX -= offX;
}
int offY = rangeY;
if (rangeY > 1)
{
offY = rangeY >> 1;
rangeY -= offY;
}
int offZ = rangeZ;
if (rangeZ > 1)
{
offZ = rangeZ >> 1;
rangeZ -= offZ;
}
Profiler.EndSample();
// Subdivide if possible
// TODO: Avoid the recursion
UpdateVisibility(x, y, z, offX, offY, offZ);
UpdateVisibility(x + offX, y, z, rangeX, offY, offZ);
UpdateVisibility(x, y, z + offZ, offX, offY, rangeZ);
UpdateVisibility(x + offX, y, z + offZ, rangeX, offY, rangeZ);
UpdateVisibility(x, y + offY, z, offX, rangeY, offZ);
UpdateVisibility(x + offX, y + offY, z, rangeX, rangeY, offZ);
UpdateVisibility(x, y + offY, z + offZ, offX, rangeY, rangeZ);
UpdateVisibility(x + offX, y + offY, z + offZ, rangeX, rangeY, rangeZ);
#endregion
}
