Re: more openGL than perf

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Ran Yakir (rany++at++rtset.co.il)
Sat, 25 Jan 1997 04:46:01 -0800

ceti wrote:
>
> Hello,
>
> this far from performer and closer to OpenGL, but I've noticed that
> here there are several OpenGL kings !!!
>
> Well,
> Here's my problem.
> I used to work under Performer with objects and scenes
> described with Inventor format. Now I have an application
> that needs to run on PC ( don'thow me stones ..).
> So I've done a loader that allows me to load Open Inventor scenes or objects
> and render under OpenGL.
>
> Everything is working fine but not the lighting.
>
> If I'm close to the object, color and material
> are quiet good and if I'm further, the object is
> "burnt", its color is white overall.
>
> So what is good standard lighting model for an OpenGL scene?
> What is basic material conversion or tricks from Open IV to Open GL ?

1. There may be bugs in the PC implementation of OpenGL, that cause this
behaviour - or -

2. You might be running into a lighting condition in which the specular
reflection, which depends also on viewer position causes the object to
be very bright - or -

3. You may have very thick white fog that makes the object white as you
get further.

Whiy don't you try disabling fog (glDisable (GL_FOG) ), and turning off
speculat lighting with glLightfv.

Ran

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