pfLayer + stencil not working on Impact?

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Nicolas Gauvin (nicolas++at++cae.ca)
Tue, 6 May 1997 19:48:36 -0400

I'm trying to use pfLayers with mode PFDECAL_BASE_STENCIL on a Max Impact
without much success. I made sure my frame buffer has at least 1 bit of stencil
and I'm using OpenGL.

If I take the pfLayer example in
/usr/share/Performer/src/pguide/libpf/C/layer.c
and force the mode to PFDECAL_BASE_STENCIL instead of the default DISPLACE I
get
flickering of the coplanar polygons.

To convince myself that the stencil was there and working correctly
I implemented the layering algorithm using the immediate glStencil* OpenGL
calls. I tried that with some simple coplanar polygons in a draw callback
of the same Performer app and it worked perfectly.

However if I put the same kind of polygons in a scene graph under a pfLayer
node with mode STENCIL it doesn't work.

                 pfLayer
                / | \
               / | \
           base layer1 layer2

  [my layers are fully contained and coplonar with the base]

I would be curious to know if others have had similar experiences.

My config is Performer 2.2 latest beta + IRIX 6.2 + Max Impact + usual gfx
patches.

-- 

---
Nicolas Gauvin              CAE Electronics Ltd., 8585 Cote De Liesse
3D Graphics Software        Saint-Laurent, Quebec, Canada, H4L-4X4
nicolas++at++cae.ca              Tel: (514) 341-2000 x2275, Fax: (514) 340-5496 
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