Optimize Collision Detection with Octree

Transcript

1. 1 Optimize Collision Detection with Octree Presented by Akihiro Oyamada (@yomotsu) Frontend Engineer at PixelGrid, Inc. Oct 7, 2014
7. 7 Collision Detection vs 524 Tris
8. 8 vs only about 30 Tris
 by partitioning
9. ෼ׂۭͨؒ͠͸
   .PSUPO
   PSEFS
   ʹैͬͯฒ΂Δ 9
15. 15 // maxDepth4のoctreeのツリー構成例 ! octree.nodes = [ [node], //level 1 (node*1個) [node,node...] //level 2 (node*8個) [node,node...] //level 3 (node*64個) [node,node...] //level 4 (node*512個) ]
16. 16 // node単体の構成例 ! OctreeNode = function ( params ) { ! this.tree // <Octree> this.depth // <Number> this.mortonNumber // <Number> this.min // <THREE.Vector3> this.max // <THREE.Vector3> this.trianglePool // <Array> ! }
17. 17 -FWFMͷͷࢠϊʔυΛٻΊΔʹ͸ʜ
18. 18 var i; ! var parentMotonNum = 1; ! for ( i = 0; i < 8; i ++ ) { ! console.log( ( parentMotonNum << 3 ) + i ); ! } ! // 8, 9, 10, 11, 12, 14, 15
19. 19 -FWFMͷͷ਌ϊʔυΛٻΊΔʹ͸ʜ
20. 20 var childMotonNum = 10; console.log( childMotonNum >> 3 ); ! // 1
21. ϏοτγϑτͰ
 ٻΊΒΕΔ 21
22. ϊʔυʹ஍ܗͷ
 τϥΠΞϯάϧΛొ࿥͢Δ 22
23. ""##
    WT
    5SJBOHMF
    ϊʔυ͸""## 23
26. NBY%FQUIΛʹͨ͠Β
 $ISPNF͕ࢭ·ͬͨ
 ? ? ? ʜ ? ݸͷϊʔυ͕Ͱ͖Δ 26
27. ܁Γฦ͠ͷ਺ΛݮΒ͢͜ͱ͕Ͱ͖ ͨ 27
28. %Ͱ͸͋Δ͚ΕͲɺ
 ஍ܗ͸ฏ໘ʹ͍ۙͷͰɺ
 2VBEUSFF % Ͱ΋͍͍͔΋
    .PSUPO/VNͱϏοτγϑτ 28
29. • THREE.RayΛ΍Ίͯɺಠࣗͷ
 Segment-Triangleަࠩςετʹஔ͖׵͑ • ίϝϯτΛେྔʹೖΕͨ(೔ຊޠ͚ͩͲ) 29 ଞʹ΍ͬͨ͜ͱ
30. 30 gl.finish(); @yomotsu