Hello Constantin,
On 11/02/2010 08:19 AM, Constantin Müller wrote:
> I got some questions concerning the clearing of the stencil buffer.
> I found the StencilChunk function setClearBuffer and found a mailinglist
> thread for the purpose of the function, but I guess I didn't get how to
> use it properly.
>
> I should call stencilChunk->setClearBuffer(1) to clear the stencilbuffer
> before the rendering and setClearBuffer(2) for clearing the buffer after
> rendering, as far as I understand it. Am I supposed to call the function
> with 0 for no clearing? Or has it to be a negative value as for
> background->setClearStencilBit?
yes, 0 for no clearing on the StencilChunk (in fact anything but 1 or 2
means no clearing).
> Do these two functions collide in their functionality, because I thougt
> the setClearStencilBit would control the clearing of the buffers.
they serve somewhat different purposes. Background::setClearStencilBit()
is to control the stencil clear at the beginning of rendering to a
framebuffer (the default one or an FBO), because the background is the
first thing to draw/clear.
The StencilChunk is mostly useful for multi pass materials where you
need to clear the stencil buffer between passes for an individual object
or group of objects. It can be a bit tricky to use though, because
OpenSG's state sorting will generally render all objects with the same
material at once, so you are not guaranteed to get a clear before/after
every object - you can force the materials to be different by setting a
sort key on them for example.
> PS: Is there any other documentation or description of the functions of
> OpenSG where I could find how to use the setClearBuffer function or
> other functions and what the parameters have to be?
If with 'other documentation' you mean other than the doxygen generated
one, then no. I usually just look in the .fcd file for a class since it
contains all the fields of that class with their type and in many cases
also a short comment.
Cheers,
Carsten
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