George Williams (gcw++at++best.com)
Thu, 14 Jan 1999 09:28:35 -0800
gw.
At 07:20 AM 1/15/99 -0800, you wrote:
>pfBasicState disables lighting I believe which would explain your
>problem. I wonder if you could reproduce everything you're trying to do
>with all pf calls:
>
>Just around your cone drawing, if you used PFTR_BLEND_ALPHA |
>PFTR_NO_OCCLUDE that should do
>glBlendFunc(GL_SRC_ALPHA,GL_ONE_MINUS_SRC_ALPHA) and disable writes to
>the depth buffer as well.
>
>If this works you can avoid messing with the pfstate which is always
>best even if just that the glenable/disables that would get triggered by
>the state push/basic/pop will have some overhead that would then be
>avoided.
>
>If you try it and it's not clear what's going on, I'd suggest tracing
>with ogldebug.
>
>Cheers
>Rob
>
>
>Bryan Walsh wrote:
>>
>> Hello pfFellows,
>>
>> Because I need to draw some geometry in native OpenGL, and as a work around
>> to some sorting issues, I have several pfGroup draw callbacks. The
geometry
>> drawn include pfdCones, pfdSpheres, as well as my native OpenGL geometry.
>> Everything works fine except the specular component of the material.
i.e., I
>> don't see the highlighting/reflection from the material. Below is a sample
>> of what I'm trying to do. Any helpful suggestions would be greatly
>> appreciated.
>>
>> typedef struct {
>> int color;
>> int visible;
>> pfGeoSet *cone;
>> pfMaterial *material;
>> pfLightModel *lightmodel;
>> pfLight *light[PF_MAX_LIGHTS];
>> pfGeoState *state;
>> int first;
>> } ConeData;
>>
>> int drawCone(pfTraverser *, void *data) {
>> ConeData *pd = (ConeData*)data;
>> if (pd->first) {
>> //
>> // pd->cone = pfdNewCone called externally
>> // pfdNewCone includes normals
>> //
>> pd->first = 0;
>> float fcolor[4];
>> fcolor[0] = (float)(pd->color & 0xff) / 0xff;
>> fcolor[1] = (float)((pd->color >> 8) & 0xff) / 0xff;
>> fcolor[2] = (float)((pd->color >> 16) & 0xff) / 0xff;
>> fcolor[3] = 0.2;
>> pd->material = new pfMaterial();
>> pd->material->setAlpha(0.15f);
>> pd->material->setShininess(40.0f);
>> pd->material->setColor(PFMTL_DIFFUSE, fcolor[0],fcolor[1],fcolor[2]);
>> pd->lightmodel = new pfLightModel();
>>
>> pd->light[0] = new pfLight();
>>
>> pfPushIdentMatrix();
>> pd->light[0]->setPos(0.0f, 1.0f, 0.0f, 0.0f);
>> pfPopMatrix();
>>
>> pd->lightmodel->setAmbient(0.8f, 0.8f, 0.8f);
>> pd->lightmodel->setLocal(PF_OFF);
>> pd->lightmodel->setTwoSide(PF_ON);
>> pd->state = new pfGeoState();
>> pd->state->setMode(PFSTATE_TRANSPARENCY, PFTR_HIGH_QUALITY);
>> pd->state->setAttr(PFSTATE_FRONTMTL, pd->material);
>> pd->state->setAttr(PFSTATE_BACKMTL, pd->material);
>> pd->cone->setGState(pd->state);
>> }
>>
>> pfPushState();
>> pfPushMatrix();
>> pfBasicState();
>>
>> pd->lightmodel->apply();
>> pd->light[0]->on();
>>
>> glEnable(GL_BLEND);
>> glBlendFunc(GL_SRC_ALPHA,GL_ONE_MINUS_SRC_ALPHA);
>> glDepthMask(GL_FALSE);
>> pd->cone->draw();
>> glDepthMask(GL_TRUE);
>>
>> pfPopMatrix();
>> pfPopState();
>>
>> return PFTRAV_CONT;
>> }
>>
>> Help would be greatly appreciated,
>>
>> Thanks
>>
>> Bryan Walsh
>>
>> =======================================================================
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>
>--
>________________________________________________________________
>Rob Jenkins Silicon Graphics mailto:robj++at++sgi.com
>=======================================================================
>List Archives, FAQ, FTP: http://www.sgi.com/software/performer/
> Submissions: info-performer++at++sgi.com
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>
>
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