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Added SmokeTrailEffect which renders created particles as single quad or line

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strip, in the case of the quad strip the strip is aligned to the be orthogonal with
the eye point.
This commit is contained in:
Robert Osfield
2005-10-12 18:42:36 +00:00
parent 540e676dae
commit 1e508d432b
16 changed files with 611 additions and 73 deletions
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31
src/osg/CullStack.cpp
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@@ -79,37 +79,8 @@ void CullStack::pushCullingSet()
const osg::Viewport& W = *_viewportStack.back();
const osg::Matrix& P = *_projectionStack.back();
const osg::Matrix& M = *_modelviewStack.back();
// pre adjust P00,P20,P23,P33 by multiplying them by the viewport window matrix.
// here we do it in short hand with the knowledge of how the window matrix is formed
// note P23,P33 are multiplied by an implicit 1 which would come from the window matrix.
// Robert Osfield, June 2002.
// scaling for horizontal pixels
float P00 = P(0,0)*W.width()*0.5f;
float P20_00 = P(2,0)*W.width()*0.5f + P(2,3)*W.width()*0.5f;
osg::Vec3 scale_00(M(0,0)*P00 + M(0,2)*P20_00,
M(1,0)*P00 + M(1,2)*P20_00,
M(2,0)*P00 + M(2,2)*P20_00);
// scaling for vertical pixels
float P10 = P(1,1)*W.height()*0.5f;
float P20_10 = P(2,1)*W.height()*0.5f + P(2,3)*W.height()*0.5f;
osg::Vec3 scale_10(M(0,1)*P10 + M(0,2)*P20_10,
M(1,1)*P10 + M(1,2)*P20_10,
M(2,1)*P10 + M(2,2)*P20_10);
float P23 = P(2,3);
float P33 = P(3,3);
osg::Vec4 pixelSizeVector(M(0,2)*P23,
M(1,2)*P23,
M(2,2)*P23,
M(3,2)*P23 + M(3,3)*P33);
float scaleRatio = 0.7071067811f/sqrtf(scale_00.length2()+scale_10.length2());
pixelSizeVector *= scaleRatio;
osg::Vec4 pixelSizeVector = CullingSet::computePixelSizeVector(W,P,M);
if (_index_modelviewCullingStack>=_modelviewCullingStack.size())
{