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

[Dan G. <dg...@hp...>]

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