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D2 Horizon Occlusion
1.
Horizon Occlusion
Flow Studio 최유표 2009.07.03
2.
Definition
1 Map = 4 * 4 Quad Leaf 1 Quad Leaf = 4 * 4 Occluder 1 Quad Leaf = 32 * 32 Cell 1 Cell = 2m 1 Occluder = 8 Cell = 16m
3.
Horizon Occlusion
Occluder AABB Bottom Plane * Horizon View Projection Matrix Occludee AABB Top Plane * Horizon View Projection Matrix If (Occludee < Occluder) then Culling
4.
Problem
2개의 점만을 사용 빈 공간이 많이 생길 수 있음 노드의 크기가 클수록 더 많은 공간이 비게 됨 Occluder나 Occludee의 크기가 작아짐 따라서 최적화의 여지가 많이 줄어들 수 있음
5.
Solution
모양 세분화 사각형 : 1개의 선 마름모 : 2개의 선 사다리꼴 : 3개의 선 평행사변형 : 2개의 선 For (Left Edge ~ Right Edge) Add Point
6.
Solution 사각형 마름모
7.
Solution 평행사변형 사다리꼴
8.
Solution Before
After
9.
Optimize
단계 세분화 거리에 따른 세분화 If (거리 < Threshold) then Split 높이의 비율에 따른 세분화 If (Threshold < 높이/거리) then Split 화면의 비율에 따른 세분화 If (Threshold < Pixel Ratio) then Split
10.
Optimize
가까운 거리