| convert all leafs in octree to PvsNode, add to list pvsNodes | |
| for (every nodeX in pvsNodes): | |
| for (every nodeY in pvsNodes): | |
| if (nodeX == nodeY or nodeX adjecent or intersecting nodeY): | |
| continue | |
| setup camera for (nodeX, nodeY) | |
| draw every node except nodeX & nodeY | |
| turn on occlusion query | |
| draw nodeY as bounding box | |
| turn off occlusion query | |
| if (numSamples > 0): // node is visible | |
| add nodeY to nodeX's potentially visible set | |
| setup camera for node, sideI: | |
| float width, height, near; | |
| switch (sideI): | |
| case X+ | |
| case X- | |
| width = x extent | |
| height = y extent | |
| near = z extent / 2 | |
| case Y+ | |
| case Y- | |
| width = x extent | |
| height = z extent | |
| near = y extent / 2 | |
| case Z+ | |
| case Z- | |
| width = z extent | |
| height = y extent | |
| near = x extent / 2 | |