Performer 2.2 fog

Svend Tang-Petersen (svend++at++digi.lego.com)
Wed, 25 Feb 1998 13:08:24 +0100

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• Previous message: Sharon Clay: "Re: Performer 2.2 manuals"

I was trying to redo some of my old C-based Performer 2.1 code in C++
and Performer 2.2.

What I did was to modify the fog ranges in the simulation loop to get an
effect of billowing fog.
When I try to do this now, I must be missing something somewhere. I'm
setting up a pfFog when
opening the window, and that's working fine. But modifying the
pfFog::setOffsets in the
simulation loop doesn't have an effect.

I've added a pfFog::apply before the pfDraw() in the drawCallback for
the channel, but the changes
don't have any effect.

--

Main:

  Shared->fog = new pfFog();
  Shared->fog->setFogType( PFFOG_PIX_EXP2 );
  Shared->fog->setColor( 0.8, 0.8, 0.8 );
  Shared->fog->setRange( 1.0, 80.0 );

--

WindowSetup routine has:

  Shared->fog->apply();
  pfEnable( PFEN_FOG );
  pfOverride( PFSTATE_FOG | PFSTATE_ENFOG, PF_ON );

--

Simulation loop:

 pfSinCos( 120 * pfGetTime(), &sin, &cos );
 Shared->fog->setOffsets( 0.0, 30.0 * sin );

--

Channel drawcallback:

 channel->clear();
 Shared->fog->apply();
 pfDraw();


--

 Svend Tang-Petersen, MSc

 LEGO                           Silicon Graphics
 Kloevermarken 120              Stationsparken 25
 7190 Billund                   2600 Glostrup
 Denmark                        Denmark

 e-mail: svend++at++digi.lego.com ,  svend++at++copen.sgi.com



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