OpenGL ignores the green setting when I do glColor3f()! I can call it like this: glColor3f(0.0, 1.0, 0.0); and it''ll still be completely black! it reeds the red and blue colors fine, but refuses to do any green at all!

Is this lack of green only a problem in your app?? It might be a video card thing, but I''m not sure, I''ve never experinced that type of problem before.


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"With my feet upon the ground I move myeslf between the sounds and open wide to suck it in, I feel it move across my skin. I''m reaching up and reaching out. I''m reaching for the random or what ever will bewilder me, what ever will bewilder me. And following our will and wind we may just go where no one''s been. We''ll ride the spiral to the end and may just go where no one''s been." - TOOL
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[TheBlackJester]

Yup, only in my app. Other stuff works fine.

Maybe a stupid question, but have you tried other colors? Like 1.0, 0.0, 0.0 or 0.0, 0.0, 1.0? Check your lighting, normals, etc.


Yesterday we still stood at the verge of the abyss,
today we''re a step onward!

Yeah. Everything works except green.

Nope, no lights. Just a simple 2D orthographic (or is it orthogonal?) scene.

I''ve done some debugging and I''ve figured out it only goes greenless when I include this in the initialization code:

glEnable(GL_TEXTURE_2D);

So why would textures screw up the green?

If your tex parameter is MODULATE, then each component of final color is determined by multplying the corresponding components of texture color and the color you provided. If your texture has no green on it, then combining it with green color will give you no color.

Here is all my OpenGL initialization code. I''m also using SDL, as u can see. I''ve already called SDL_Init(SDL_VIDEO); or whatever it is.

SDL_GL_SetAttribute( SDL_GL_DOUBLEBUFFER, 1 );
lpBackBuffer = new GUI_Surface;
lpBackBuffer->surface = SDL_SetVideoMode ( Settings.GetResWidth() , Settings.GetResHeight() ,16, SDL_OPENGL | SDL_GL_DOUBLEBUFFER | SDL_HWPALETTE ) ;



/* Enable smooth shading */
glShadeModel( GL_SMOOTH );
glEnable(GL_TEXTURE_2D);

/* Set the background black */
glClearColor( 0.0f, 0.0f, 0.0f, 0.0f );
glViewport(0, 0, 800,600);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();

glOrtho(0.0f,800,600,0.0f,-1.0f,1.0f);
glMatrixMode(GL_MODELVIEW);

This code is sort of sloppy cause I''ve been playing with it trying to get it to show green. GUI_Surface is something I made. Basically it has a pointer to an SDL_Surface and a GLuint for the texture.

This is the code that draws a simple triangle. Note the absence of green.

glBegin( GL_TRIANGLES ); /* Drawing Using Triangles */
glColor3f( 20.0f, 0.0f, 0.0f );
glVertex3f( 0.0f, 200.0f, 0.0f );
glColor3f( 0.0f, 20.0f, 0.0f );
glVertex3f( 0.0f, 0.0f, 0.0f );
glColor3f( 0.0f, 0.0f, 10.0f );
glVertex3f( 200.0f, 0.0f, 0.0f );
glEnd( );

Can anyone seen any problems with this code?