Rendering nonconvex polygons?

Graphics and GPU Programming Programming OpenGL

Started by mjs2000 November 28, 2004 05:52 AM

2 comments, last by mjs2000 19 years, 4 months ago

mjs2000

122

Author

November 28, 2004 05:52 AM

For the 2D top-down game I'm working on, I'm going to have to render arbitrary, "nonconvex" polygons (like "T"s and polygons with indentations). OpenGL doesn't like polygons like that...what's the cheapest way to get this to work? (I'm assuming you have to subdivide the polygon into convex shapes--where can I find an algorithm (or built-in OpenGL function?) for that?) -matt

Monder

993

November 28, 2004 09:23 AM

This may be helpful.

Oh and nonconvex polygons are generally known as concave polygons.

Morten

139

November 28, 2004 11:15 AM

gluTess* does what you want, but it's slow so for anything realtime you'll want to cache the output.

-Morten-

mjs2000

122

Author

November 28, 2004 05:37 PM

Thanks. I thought GLU had tessellation functions, but I've been away and haven't had my Redbook on hand.

-matt

Rendering nonconvex polygons?

This topic is closed to new replies.

Popular Topics

Recommended Tutorials

Rendering nonconvex polygons?

This topic is closed to new replies.

Popular Topics

Recommended Tutorials

Reticulating splines