filled polgon not working for star-shape...

OpenGL Development JOGL Development
#1

I have a set of coordinates ( 10 of them ) that forms a star-shape. When I use GL.glBegin(GL_LINE_STRIP ), the lines show up as a star-shape ( as expected ) but not filled. When I try to use GL_POLYGON, I see that the first coordinate and the last coordinate dont complete. Rather polygon 1-2-3 get filled and then the rest are filled correctly.

Any ideas ?

Thanks

– pady

#2

GL_POLYGON is only for convex shapes, RTFM. You’ll have to chop it up into triangles yourself.

#3

For star shape, you have to tesselate your polygon (break into triangles). You can use GLUtesselator that comes with JOGL. You will find a demo in jogl-demos project at java.net, src\demos\tess\Tess.java.

Yuri