[Plib-devel] ssg color question

[Curtis L. O. <cu...@me...>]

Steve,

I have a color question for you.

I seem to get the expected results (correct colors) when I create a
state with:

  enable( GL_COLOR_MATERIAL )
  setColourMaterial( GL_AMBIENT_AND_DIFFUSE )

And then I feed in my desired color array when I create the VtxTable.

Now, I have a multi-VtxTable object (a sphere where each slice is a
separate triangle strip.)  I would like to be able to control the
color of this object by just modifying the associated state.  My first
attempt was to pass in a NULL color array when I create the VtxTables.
My state was set up with:

  disable( GL_COLOR_MATERIAL );
  setMaterial( GL_AMBIENT_AND_DIFFUSE, 1.0, 1.0, 1.0, 1.0 );

However, if I later go and update the Material color in the state, the
rendered object color doesn't change.

I know we already did the rounds on this with David Megginson (but I
wasn't paying attention at the time ... <slap, slap>)

Should my approach work, or am I missing something obvious?  From a
brief look at the code, I wonder if ssg is overriding the state's
color for objects that have no color list defined?

Any thoughts ... or should I just avoid setting global material colors
and stick with enable(GL_COLOR_MATERIAL) and modify the color array?

Thanks,

Curt.
-- 
Curtis Olson   University of MN, ME Dept.       Flight Gear Project
Twin Cities    cu...@me...                  cu...@fl...
Minnesota      http://www.menet.umn.edu/~curt   http://www.flightgear.org