Hi,
I render some quardric objects using gluCylinder, gluDisk(), etc. But it seems that all the faces reflect the same amount of light. Do you know why? I know I have to set normals for drawing polygons. But I am drawing quardric objects, not polygons. I also know that it can be caused if diffuse light is too weak while ambient light is too strong. But it is not my case. Please help. Thanks.
Tony