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Clumsy lighting

Started by Windfall May 21, 2006 at 3:35 AM 5 replies 1.2k views

Original Post

May 21, 2006 at 3:35 AM

Hi, I had to write two similiar programs in openGL and DirectX. In openGL lights are very 'quadratic'. Here is the screenshot: openGL

while in directX are ok - it's the same object loaded: openGL

What can cause the problem ? Many thanks Bartek

Ezbez

154

Ezbez

May 21, 2006 at 3:58 AM

OpenGL does, by defualt, Per-Vertex lighting. I have no experience with DirectX, but it appears that DirectX does per-pixel lighting. If you want to do per-vertex lighting in OpenGL, you're going to have to write a shader for it.

acid2

May 21, 2006 at 4:06 AM

Quote:
Original post by Ezbez
OpenGL does, by defualt, Per-Vertex lighting. I have no experience with DirectX, but it appears that DirectX does per-pixel lighting. If you want to do per-vertex lighting in OpenGL, you're going to have to write a shader for it.

Nope, DX does per vertex. Looks to me a problem with your normals, do you know what they are?

deavik

May 21, 2006 at 5:47 AM

It looks like the normals aren't unit length to me. To check, put a glEnable(GL_NORMALIZE); somewhere in the init code and see if it works.

Windfall

Author

Windfall

May 21, 2006 at 7:53 AM

Hi, unfortunetly it doesn't work :( I know that normals are normalized, even if I enter glEnable(GL_NORMALIZE) it looks the same. I am wondering if I shouldn't set something for device, but have no idea what.

Windfall

Author

Windfall

May 21, 2006 at 10:02 AM

Yes! Looks far more better:

openGL

There is some roughness in lighting during rotations, can I use it also for back faces ?

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