Pre/Post Draw Callbacks, dissapointment!

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Torres Mario 678-3280 AMSRL-BE-M (mtorres++at++arl.mil)
Mon, 28 Aug 95 16:04:34 MDT

  
  On the recommendation of a few good programmers from this list, I tried
to illuminate a helicopter by dimming the pfLightColor of the sun on the
perfly program through the use of PreDraw and PostDraw functions. I am
very dissapointed because through this functions I can't even turn off
the light for the helicopter in the PreDraw and then back ON in the
PostDraw. I've set it up in the following manner if anyone cares to comment:

 pfNodeTravFuncs(Apache->dcs , PFTRAV_CULL,
                        apachePreCull, apachePostCull);

long apachePreDraw(pfTraverser *trav, void *data)
{
  oldtod=ViewState->tod;
    ViewState->tod=0.00f;
    pfLightAmbient(ViewState->sun, 0.0f, 0.0f, 0.0f);
    pfLightColor(ViewState->sun, ViewState->tod, ViewState->tod,
                                                 ViewState->tod);
}

long apachePostDraw(pfTraverser *trav, void *data)
{

    ViewState->tod=oldtod;
    pfLightAmbient(ViewState->sun, 0.2f*ViewState->tod,
                                   0.2f*ViewState->tod,
                                   0.2f*ViewState->tod);
    pfLightColor(ViewState->sun, ViewState->tod, ViewState->tod,
                                                 ViewState->tod);
}

  The apache model is a multigen model, and I would expect that the model
would be dark as if with no light and then the rest of the terrain would
appear with the light.

 Also, is updating the apache DCS in the preDraw function a good or bad
practice?

  All +comments welcomed,

 Mario T.
   

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