Hello All, I am new to Opengl. If i specify different color for each polygon vertex and my shade model is GL_SMOOTH i would be getting a smooth color transformation effect. To be more precise, glBegin(GL_POLYGON); glColor3f(0.0f,0.0f,0.0f); glVertex2f(-150.0f,-150.0f); glColor3f(0.0f,0.0f,0.0f); glVertex2f(150.0f,-150.0f); glColor3f(0.0f,0.0f,1.0f); glVertex2f(150.0f,150.0f); glColor3f(0.0f,0.0f,1.0f); glVertex2f(-150.0f,150.0f); glEnd(); I would get a Polygon of the above said area starting from the bottom with the color Black and smoothly progressing towards Blue color when it reaches the top. Can i get this effect for a quadric(disk,cylinder...)object if so how can i do that ? Without lighting ? Please help me to get this. Thanks in Advance ! Edited by - urram on September 10, 2001 9:25:09 AM Edited by - urram on September 10, 2001 9:36:10 AM