Hi OpenSG-Users,
I got some problems with rendering in OpenSG.
So far I was using the SimpleSceneManager for rendering in OpenSG, so
I have currently not really an idea on how to do this in OpenSG.
I read through some code examples, but I can't distinguish the
necessary steps and the intention of all the steps done to render more
or less "by hand".
What I'm up to is to render a Scene slice by slice into a
Stencilbuffer and save this Buffer-values.
I have to render the scene at least 2 times for every slice, one time
with frontface-culling, second time with backface-culling.
After this two rendering passes I need the value of the stencil buffer.
I got the testStage example running and wanted to modify the file for my needs.
Now I can't really see, where I have to or better where I could modify
the parameters for the rendering.
Here is some OpenGL code, doing what I want to do in OpenSG.
// first rendering
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT |
GL_STENCIL_BUFFER_BIT);
glClearStencil(0x0);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
glColorMask(GL_FALSE, GL_FALSE, GL_FALSE, GL_FALSE);
glDepthMask(GL_FALSE);
glEnable(GL_STENCIL_TEST);
glEnable(GL_CULL_FACE);
glCullFace(GL_FRONT);
glStencilFunc(GL_ALWAYS,0,0xff);
glStencilOp(GL_KEEP, GL_INCR, GL_INCR);
drawGeometry();
//second rendering
glCullFace(GL_BACK);
glStencilOp(GL_KEEP, GL_DECR, GL_DECR);
glStencilFunc(GL_ALWAYS,0,0xff);
drawGeometry();
Where can I clear the Buffer-bits and the Buffers themselves?
Where can I set the Stencil-Function-Parameters or the Stencil-Operations?
I hope these aren't to many question, but I'm somehow lost in the
OpenSG-Documentation.
kind regards and thanks for your help,
Constantin
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