hi there,

today I had the idea to write a list of things to check if there's nothing rendered on screen, for newbies.

I think this would tremendously help them, especially if there would be a piece of code that check each of these.

If you have any additions to this list, please comment it below.

-is there any opengl context?

-is any kind of swapbuffer called?

-is it called after everything has been rendered?

-what kind of frame buffer object are you rendering into?

-if you are using shaders, do you bind the correct one?

-are the shader uniforms bound?

-are shaders compiled and linked properly?

-is there any vertex buffer object, vertex array object bound?

-is there any index buffer object bound?

-if you are using textures, are the textures bound?

-are you using the depth state that you want to use?

-is blending enabled?

-are you using the blending function you wanted to use?

-is scissoring enabled?

-is backface culling enabled?

etc.

please contribute to this list :)

Great list, but I'd like to add that one should also test for OpenGL errors.

Greate list, but I'd like to add that one should also test for OpenGL errors.

of course :)

Subsets of the above:

• Are you sure you translated along the Z axis in the correct direction? (I should know on this one)
• Did you translate it far enough from the camera? (i.e. beyond the near plane)