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Optimize Collision Detection with Octree
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yomotsu
October 08, 2014
Programming
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740
Optimize Collision Detection with Octree
yomotsu
October 08, 2014
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Transcript
1 Optimize Collision Detection with Octree Presented by Akihiro Oyamada
(@yomotsu) Frontend Engineer at PixelGrid, Inc. Oct 7, 2014
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7 Collision Detection vs 524 Tris
8 vs only about 30 Tris by partitioning
ׂۭͨؒ͠ .PSUPOPSEFSʹैͬͯฒΔ 9
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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 // 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 -FWFMͷͷࢠϊʔυΛٻΊΔʹʜ
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 -FWFMͷͷϊʔυΛٻΊΔʹʜ
20 var childMotonNum = 10; console.log( childMotonNum >> 3 );
! // 1
ϏοτγϑτͰ ٻΊΒΕΔ 21
ϊʔυʹܗͷ τϥΠΞϯάϧΛొ͢Δ 22
""##WT5SJBOHMF ϊʔυ""## 23
24
25
NBY%FQUIΛʹͨ͠Β $ISPNF͕ࢭ·ͬͨ ? ? ? ʜ ? ݸͷϊʔυ͕Ͱ͖Δ 26
܁Γฦ͠ͷΛݮΒ͢͜ͱ͕Ͱ͖ ͨ 27
%Ͱ͋Δ͚ΕͲɺ ܗฏ໘ʹ͍ۙͷͰɺ 2VBEUSFF % Ͱ͍͍͔ .PSUPO/VNͱϏοτγϑτ 28
• THREE.RayΛΊͯɺಠࣗͷ Segment-Triangleަࠩςετʹஔ͖͑ • ίϝϯτΛେྔʹೖΕͨ(ຊޠ͚ͩͲ) 29 ଞʹͬͨ͜ͱ
30 gl.finish(); @yomotsu