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Why lines are NOT affected by light?

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Started by WWWFdisk April 05, 2006 06:29 AM

4 comments, last by WWWFdisk 18 years, 3 months ago

WWWFdisk

122

Author

April 05, 2006 06:29 AM

I used glBegin(GL_LINES) to add some lines into the scene. But the lines look like 2D objects, they're dark and don't change brightness when rotating. Howerver, the other objects in the scene display correctly. How to ensure the lines be shadered correctly? Thanks to every one read this message!

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Staffan E

536

April 05, 2006 06:45 AM

I don't know what can be done in openGL, but if your line vertices contain normal direction information they should be lightable and shadeable.

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WWWFdisk

122

Author

April 05, 2006 06:53 AM

In fact I used glVertex3f to add these lines.
How to manage the Normal of the vertices added by glVertex3f?
Thank you.

Kambiz

759

April 05, 2006 08:19 AM

glNormal

nefthy

184

April 05, 2006 09:31 AM

make sure you call glNormal before glVertex, else you will get stange results.

WWWFdisk

122

Author

April 05, 2006 09:55 PM

Thanks to you all!
I added glNormal3f(0,0,1) before glVertex and now they look quite bright.
:)

This topic is closed to new replies.

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