Billboarding

Graphics and GPU Programming Programming

Started by stickymango April 30, 2002 08:19 AM

1 comment, last by stickymango 22 years ago

122

Author

April 30, 2002 08:19 AM

Does anybody have any robust code for calculating the rotation angle of a billboard to face the camera?? All the code I have tried has a problem when zooming in/out where the billboard appears to rotate to side view. Any pointers or help would be appreciated. Thanks

Gammastrahler

150

April 30, 2002 11:59 AM

extract your modelview matrix. then, extract the up and/or right from that matrix and apply it to your vertices.

Kerion

122

May 01, 2002 02:35 PM

I could be wrong, I am not a super math expert, but I beleive the inverse of your view matrix will give you camera facing polygons, if you use it as your world transform for those vertices.