Transparency problem

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From: Boris Mansencal (boris.mansencal++at++inria.fr)
Date: 01/12/2001 09:33:39

Hi pfAll,

I have a problem with transparency.
I load a file with several objects, and I would like
to change only the alpha component for one of the
pfGeoSets. (I know the color is defined in the pfGeoSet, but
I

I have the following code (with myGeoSet being a red box for example) :
...
pfGeoState *gstate = myGeoSet->getGState()
pfMaterial *matl = new pfMaterial();
matl->setColorMode(PFMTL_FRONT, mode);
matl->setAlpha(0.3);
gstate->setAttr(PFSTATE_FRONTMTL, matl);
gstate->setMode(PFSTATE_TRANSPARENCY, PFTR_ON);
...

If mode==PFMTL_CMODE_OFF, my object is transparent, but white/grey
(the color of the pfGeoSet has no effect, it's ok.)

If mode==PFMTL_CMODE_AMBIENT_AND_DIFFUSE, my object is red but not
transparent.

Could somebody tell me what's wrong ?

Is there a better way to do this ?

Thanks a lot.

Boris. 

-- 
Boris Mansencal
INRIA Rocquencourt (France) - projet i3D

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