OpenGL function calls

calling glNormal and glColor BEFORE glVertex will apply the normal and the color to the vertex drawn. If you call those functions AFTER glVertex, they won''t apply until the next vertex is drawn. As far as glTexCoord and glColor, I think calling them both will apply a texture to a vertex, and tint it that color, but I don''t think it would make a difference which order the two go in. How does it mess up? What happens differently when you put them in the other order?

It was a while ago so it may have been two other functions I''m confusing. Probably

So what your saying is that glVertex has to be the last one called?

Yes, it has to be the last one, assuming you want all the calls to apply to that vertex. Calling glColor just sets the current color, which the later glVertex call will use. For instance, if I want to draw a quad with four colors blended across each vertex, I would specify each vertex''s color before i draw it.

glBegin(GL_QUADS);

glColor3f(1.0f, 0.0f, 0.0f); // Sets current color to red
glVertex3f(0.0f, 0.0f, 0.0f); // Draws a red vertex

glColor3f(0.0f, 1.0f, 0.0f); // Sets current color to green
glVertex3f(1.0f, 0.0f, 0.0f); // Draws a green vertex

glColor3f(0.0f, 0.0f, 1.0f); // Sets current color to blue
glVertex3f(1.0f, 1.0f, 0.0f); // Draws a blue vertex

glColor3f(1.0f, 1.0f, 0.0f); // Sets current color to yellow
glVertex3f(0.0f, 1.0f, 0.0f); // Draws a yellow vertex

glEnd();


whereas if you did this...

glBegin(GL_QUADS);

glVertex3f(0.0f, 0.0f, 0.0f); // Draw a vertex with last color
glColor3f(1.0f, 0.0f, 0.0); // Set color to red

glVertex3f(1.0f, 0.0f, 0.0f); // Draw a red vertex
glColor3f(1.0f, 0.0f, 0.0); // Set color to green

glVertex3f(1.0f, 1.0f, 0.0f); // Draw a green vertex
glColor3f(1.0f, 0.0f, 0.0); // Set color to blue

glVertex3f(0.0f, 1.0f, 0.0f); // Draw a blue vertex
glColor3f(1.0f, 0.0f, 0.0); // Set color to yellow
// doesnt apply to any vertex

glEnd();

....you wouldnt get the intended result.