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0026601: Visualization, Ray Tracing - make Path Tracing results reproducible for the same camera position

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OpenGl_View - reset Random Number Generator seed on progressive render restart
to produce the same visual results.
This commit is contained in:
kgv 2015-08-25 15:43:31 +03:00 committed by bugmaster
parent 1581d6511b
commit 1bd2fee414
2 changed files with 16 additions and 4 deletions
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5
src/OpenGl/OpenGl_View_Raytrace.cxx
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@ -2396,6 +2396,11 @@ Standard_Boolean OpenGl_View::runRaytraceShaders (const Graphic3d_CView&
if (myRaytraceParameters.GlobalIllumination)
{
if (myAccumFrames == 0)
{
myRNG.SetSeed();
}
// Set frame accumulation weight
myRaytraceProgram->SetUniform (theGlContext,
myUniformLocations[0][OpenGl_RT_uSampleWeight], 1.f / (myAccumFrames + 1));

15
src/math/math_BullardGenerator.hxx
View File

@ -24,14 +24,21 @@ class math_BullardGenerator
public:
//! Creates new Xorshift 64-bit RNG.
Standard_EXPORT math_BullardGenerator(unsigned int theSeed = 1)
: myStateHi (theSeed)
math_BullardGenerator (unsigned int theSeed = 1)
: myStateHi (theSeed)
{
SetSeed (theSeed);
}
//! Setup new seed / reset defaults.
void SetSeed (unsigned int theSeed = 1)
{
myStateHi = theSeed;
myStateLo = theSeed ^ 0x49616E42;
}
//! Generates new 64-bit integer value.
Standard_EXPORT unsigned int NextInt()
unsigned int NextInt()
{
myStateHi = (myStateHi >> 2) + (myStateHi << 2);
@ -42,7 +49,7 @@ public:
}
//! Generates new floating-point value.
Standard_EXPORT Standard_Real NextReal()
Standard_Real NextReal()
{
return NextInt() / static_cast<Standard_Real> (0xFFFFFFFFu);
}