Hi JS,
Are you doing a :
stateset->setAttributeAndModes(material);
If so then if you use a 1.2 or before the above will enable
GL_COLOR_MATERIAL. In CVS it doesn't so you usage should be fine.
Robert.
On 12/16/06, Jean-Sebastien Guay <[EMAIL PROTECTED]> wrote:
Hello Robert,
> As a general guide, with OpenGL setting the glColor on many seperate
> objects will be faster than setting it via glMaterial.
> Another general hint is the using ShapeDrawable to render sphere's is
> not efficient, [...]
I am not looking for speed right now, just wondering why it isn't doing what I
think it should be doing...
> Finally, glMaterial and glColor interact, with glColour override the
> glMaterial (that is used for the final lighting calculation). You
> really need to read up on glMaterial/glColorMaterial in OpenGL docs
> for a good explanation of the what the ins and outs are.
> Material::setColorMode is the OSG's equivilant to glColorMaterial.
I am not using glColorMaterial, as the default for Material is _colorMode = OFF
(as per the osg::Material constructor).
I'm sorry, perhaps I gave you the impression I had not put any work into solving
this myself... Here is what I think is happening, please correct where I am
wrong (I am obviously wrong somewhere, since I'm not getting the results I
think I should).
If I am not mistaken, the flow is more or less like this in the draw traversal:
[...]
- encounter Material (on one of the geode's parent nodes)
Material::apply(State&)
glDisable(GL_COLOR_MATERIAL); // because _colorMode is OFF
glColor4fv(_diffuseFront.ptr()); // which has no effect since
GL_COLOR_MATERIAL is disabled
glMaterialfv(ambient) // pseudocode
glMaterialfv(diffuse)
glMaterialfv(specular)
glMaterialfv(emissive)
glMaterialf(shininess)
end Material::apply(State&)
- encounter ShapeDrawable (in a Geode which is a child of the node containing
the Material)
ShapeDrawable::drawImplementation(State& state)
glColorfv(_color.ptr()); (which has no effect, as above)
draw the shape with a DrawShapeVisitor
end ShapeDrawable::drawImplementation(State& state)
[...]
So, if the above is correct, if the Material's diffuse front-face color is red,
then the sphere should be red. The DrawShapeVisitor never sets any color or
material properties, so unless someone else enables GL_COLOR_MATERIAL behind my
back, the Material should have the desired effect. Can someone help me spot my
mistake? _Is_ anyone re-enabling GL_COLOR_MATERIAL behind my back?
Thanks in advance,
J-S
--
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Jean-Sebastien Guay [EMAIL PROTECTED]
http://whitestar02.webhop.org/
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