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Please please help!

Started by hannahcool2000 Mar 7, 2008 at 7:36 AM 3 replies 600+ views

Original Post

hannahcool2000

Mar 7, 2008 at 7:36 AM

Hello I urgently need help with a texture shader problem. I have a 2D texture mapped on a cube and I need the texture to swirl in a circular motion by modifying the texture coordinates. Do I need to do the coding in main or in the shaders and how do I do it? Please help! Hannah

iliak

Mar 7, 2008 at 7:47 AM

glMatrixMode(GL_TEXTURE);
glRotate(...);
glScalef(...);
glTranslate(...);

?

hannahcool2000

Author

hannahcool2000

Mar 7, 2008 at 7:54 AM

Thanks

I'm not sure what to put in the rotate function though (do I put the texture coordinates in) or where to put it.
Do I put the rotate function before the drawing of the cube and is it the texture coordinates that I put in the totate function

iliak

Mar 7, 2008 at 8:31 AM

As a hint, heres'a how I map texture with my 2D engine to access them by pixels :

Gl.glMatrixMode(Gl.GL_TEXTURE);
Gl.glLoadIdentity();
Gl.glScalef(1.0f/texture.Size.Width, 1.0f/texture.Size.Height, 1.0f);

You can rotate, zoom it at will...

Edit : http://www.loria.fr/~roegel/cours/iut/opengl/addison.pdf, page 79

hannahcool2000

Author

hannahcool2000

Mar 7, 2008 at 8:34 AM

thanks again!

I'll try that later

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