OpenGL / Moveing textures?

Hey.

I have been makeing a pong game in OpenGL (the first *real* thing i am making in openGL)
I have been useing the Nehe basecode (nehe.gamedev.com) and have been able to make 2 pods wich I can move up and down, I have been able to make a small box and add a texture to it so it looks like a ball.

Now to my problem

I cant get my "ball", wich is just a quad with a texture to it, to move.

I have made my ball like this "glVertex3f(ballLTX, ballLTY, 0.0f);" so I am able to move it any way I want too.
However If I put a code like this :

Code:

			if (keys['Q'])
			{
				while (ballLTX < 6.0f )
				{
					ballLTX+=0.05f;
					ballRTX+=0.05f;
					ballRBX+=0.05f;
					ballLBX+=0.05f;

		

				}//end while


			}//end if

My box, or ball disaperase for some reason....Any help on this would be really great as I am out of ideas right now

(please note that I am new to OpenGL)

Post your rendering code - that won't help us.

Not sure what bit of code you are after.. but this is what I have done to make the textured ball

Code:

glEnable (GL_TEXTURE_2D);
glBindTexture(GL_TEXTURE_2D, texture[0]);
glBegin(GL_QUADS);
glTexCoord2f(0.0f, 0.0f);glVertex3f(ballLTX, ballLTY, 0.0f);
glTexCoord2f(1.0f, 0.0f);glVertex3f(ballRTX, ballRTY, 0.0f);
glTexCoord2f(1.0f, 1.0f);glVertex3f(ballRBX, ballRBY, 0.0f);
glTexCoord2f(0.0f, 1.0f);glVertex3f(ballLBX, ballLBY, 0.0f);
glEnd();
glDisable (GL_TEXTURE_2D);

I have of cuase defined the ballLTX (ball, left top X), ballRTX (ball right top X) and so on

Code:

if (keys['Q'])
			{
				while (ballLTX < 6.0f )
				{
					ballLTX+=0.05f;
					ballRTX+=0.05f;
					ballRBX+=0.05f;
					ballLBX+=0.05f;

		

				}//end while


			}//end if

That will change the ball's position before displaying it. Try removing the loop and possibly changing 0.05f to 0.01f (just to make sure it doesn't dissappear too quickly).

Edit: Or maybe you meant that to be an if statement?

are you redrawing the screen after the ball's position has been updated? make sure you glFlush() too.

doh! Yes of cuase that should be a if...thanks for pointing it out...works now so thanks a lot

btw...I might need some help later with figuering out how my box knows when it hits a pod but I will try a few things out first

It might be easier to just use a glTranslate instead of what you're doing. It'd be much easier to manage. Just a thought.

Yes just use glTranslatef instead, it will be much easier later on. To check if the ball hits one of the pods check the quad with the ball against the pods. For example:

The ball quad has the size 16x16 and the pods has the size 8x64 pixels.
Now calculate the middle coordinate for the ball quad and the pod quad (8,8 and 4, 32). Now lets say the ball is heading to the left. Check if the the balls top side is within the pods quad, if it is check if the balls left side is in the quad.

Hope I gave you some hints on how to check for hits, its not the best but its working. I am currently using something similar to this method in my alpha game demo I have posted here.