Hello Constantin,
Constantin Müller wrote:
> 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?
clearing of buffers is controlled by the Background of your Viewport.
SFInt32 _sfClearStencilBit is the value written to the stencil buffer
(negative values mean the buffer is not cleared).
SFReal32 _sfDepth is the clear depth.
SFBool _sfClearDepth controls if the depth buffer is cleared
SFBool _sfClearColor controls if the color buffer is cleared
> Where can I set the Stencil-Function-Parameters or the Stencil-Operations?
This is controlled by the StencilChunk. You can either add one to all
your Materials or place a Node with a ChunkOverrideGroup near the root
of your scene.
Front/Backface culling is controlled by the PolygonChunk (SFCullFace).
ColorMask is controlled by the ColorMaskChunk and DepthMask by the
DepthChunk.
Cheers,
Carsten
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