FGFS-4.1/OpenSceneGraph
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Introduce osgParticle::ParticleSystem::s/getParticleScaleReferenceFrame() to

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help manage the scaling of particles, whether they should be relative to the
local coordiante frame of the particle system, or be in world coordinates.
This commit is contained in:
Robert Osfield
2008-03-17 12:09:05 +00:00
parent 7ec5673a7e
commit 00f161ca35
4 changed files with 68 additions and 15 deletions
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41
src/osgParticle/ParticleSystem.cpp
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@@ -22,6 +22,7 @@ osgParticle::ParticleSystem::ParticleSystem()
_alignment(BILLBOARD),
_align_X_axis(1, 0, 0),
_align_Y_axis(0, 1, 0),
_particleScaleReferenceFrame(WORLD_COORDINATES),
_doublepass(false),
_frozen(false),
_bmin(0, 0, 0),
@@ -45,6 +46,7 @@ osgParticle::ParticleSystem::ParticleSystem(const ParticleSystem& copy, const os
_alignment(copy._alignment),
_align_X_axis(copy._align_X_axis),
_align_Y_axis(copy._align_Y_axis),
_particleScaleReferenceFrame(copy._particleScaleReferenceFrame),
_doublepass(copy._doublepass),
_frozen(copy._frozen),
_bmin(copy._bmin),
@@ -102,9 +104,6 @@ void osgParticle::ParticleSystem::drawImplementation(osg::RenderInfo& renderInfo
// get the current modelview matrix
osg::Matrix modelview = state.getModelViewMatrix();
if (_alignment == BILLBOARD)
state.applyModelViewMatrix(0);
// set up depth mask for first rendering pass
glPushAttrib(GL_DEPTH_BUFFER_BIT);
glDepthMask(GL_FALSE);
@@ -174,10 +173,32 @@ void osgParticle::ParticleSystem::single_pass_render(osg::State& /*state*/, con
if (_particles.size() <= 0) return;
float scale = sqrtf(static_cast<float>(_detail));
const Particle* startParticle = &_particles[0];
startParticle->beginRender();
osg::Vec3 xAxis = _align_X_axis;
osg::Vec3 yAxis = _align_Y_axis;
if (_alignment==BILLBOARD)
{
xAxis = osg::Matrix::transform3x3(modelview,xAxis);
yAxis = osg::Matrix::transform3x3(modelview,yAxis);
float scaleX = xAxis.length();
float scaleY = yAxis.length();
if (_particleScaleReferenceFrame==LOCAL_COORDINATES)
{
xAxis /= scaleX;
yAxis /= scaleY;
}
else
{
xAxis /= (scaleX*scaleX);
yAxis /= (scaleX*scaleY);
}
}
for(unsigned int i=0; i<_particles.size(); i+=_detail)
{
const Particle* currentParticle = &_particles[i];
@@ -190,16 +211,8 @@ void osgParticle::ParticleSystem::single_pass_render(osg::State& /*state*/, con
startParticle = currentParticle;
}
++_draw_count;
switch (_alignment) {
case BILLBOARD:
currentParticle->render(modelview.preMult(currentParticle->getPosition()), osg::Vec3(1, 0, 0), osg::Vec3(0, 1, 0), scale);
break;
case FIXED:
currentParticle->render(currentParticle->getPosition(), _align_X_axis, _align_Y_axis, scale);
break;
default:;
}
currentParticle->render(currentParticle->getPosition(), xAxis, yAxis, scale);
}
}