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0027590: Visualization, Ray Tracing - port to quad BVH trees (QBVH)

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In frames of this issue binary BVH tree produced by building algorithms was collapsed into 4-ary BVH (QBVH).
The BVH traversal code in GLSL was modified to process such trees correctly.
This allows to implore thread coherence, decrease BVH memory consumption (~2 times), and use traversal stack of the half size.
As a result, ray tracing scalability is improved, as well as rendering performance. For various setups, speedup is 12-18%.
This commit is contained in:
dbp
2016-06-20 19:43:44 +03:00
committed by bugmaster
parent 9cc4e7e2db
commit f2474958ef
19 changed files with 936 additions and 540 deletions
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src/OpenGl/OpenGl_View.hxx
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@@ -771,7 +771,7 @@ protected: //! @name data types related to ray-tracing
static const Standard_Integer THE_DEFAULT_NB_BOUNCES = 3;
//! Default size of traversal stack.
static const Standard_Integer THE_DEFAULT_STACK_SIZE = 24;
static const Standard_Integer THE_DEFAULT_STACK_SIZE = 10;
//! Compile-time ray-tracing parameters.
struct RaytracingParams