What are you doing to ensure that the triangles are rendered in back-to-front
order?
-Paul
On 7/3/2012 2:06 PM, Preet wrote:
Hi.
I have a simple model I wanted to apply transparency to. I load the
model data into a geometry node, and set my scene up. To get a
transparent effect, I apply an alpha value to gl_FragColor in my
fragment shader.
The shaders are trivial:
Vertex:
void main()
{
gl_Position = gl_ModelViewProjectionMatrix * gl_Vertex;
}
Fragment:
void main()
{
gl_FragColor = vec4(1,0,0,0.5);
}
I get a strange output that sort of works, but renders a different
result based on the camera position. It's hard to describe so I
attached a short youtube clip. It seems like certain triangles are
only rendered at certain camera angles.
http://youtu.be/fQUFSff-uuU
I played around with some of the settings I thought might be relevant
but I still get the effect that the video shows.
osg::StateSet *ss = geodeMesh->getOrCreateStateSet();
ss->setAttributeAndModes(shProgram,osg::StateAttribute::ON);
ss->setMode(GL_BLEND,osg::StateAttribute::ON);
// options i tried changing around
// ss->setMode(GL_DEPTH_TEST,osg::StateAttribute::ON);
// ss->setMode(GL_DEPTH_WRITEMASK,osg::StateAttribute::OFF);
// ss->setMode(GL_CULL_FACE,osg::StateAttribute::OFF);
// ss->setRenderingHint(osg::StateSet::TRANSPARENT_BIN);
Any advice would be appreciated.
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