RE: [Plib-devel] SSG bux fixes for untextured .3ds objects

[Dave M. <Dav...@dy...>]

Nice job tracking this down Dan!  I don't understand OpenGL lighting very
well so could another plib developer investigate this?

--Dave

> Last week I posted on plib-users about problems I was having 
> with .3ds objects
> that were not textured.  I figured out a couple changes that 
> solved the problems
> for me, and I'm assuming this is the right place to post them.
> 
> 1. Non-textured objects show up as white when textured 
> objects drawn before them.
> 
> I started with the tux ssg example program.  One of the 
> textured objects drawn
> sets the GL_EMISSION material values to 1.0,1.0,1.0.  When 
> the .3ds objects are
> drawn without textures it sets the ambient, diffuse, and 
> specular material properties,
> but doesn't set the emissive back to 0.0.  I added a line to 
> ssgSimpleState::apply
> to set it to 0.0 if it isn't specified.  I don't know if this 
> is the correct place or
> not.
> 
> 2. First non-textured object always shows up as white in 
> scene with or without textures
> 
> I believe this was happening because 
> glDisable(GL_COLOR_MATERIAL) is called AFTER
> the glMaterial calls in ssgSimpleState::apply.  This causes 
> the glMaterial calls
> to be ignored for the first object, but work for subsequent 
> objects.  I think that is
> what happens.  My workaround was to move the ssgDisableTable 
> call to before
> the glMaterial calls.
> 
> I don't know if either of these is the proper solution, or if 
> they would break
> other areas.  They seemed to work for me though.
> 
> Dan
> 
> _______________________________________________
> plib-devel mailing list
> pli...@li...
> http://lists.sourceforge.net/mailman/listinfo/plib-devel
>