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smooth polygon faces (Read 914 times)
Henrik
smooth polygon faces
Apr 11th, 2006, 1:55pm  
Hi,
Im trying to make 3D polygon shape, and i want the polygons to be smooth, so that there is no visible edge between the adjacent polygon faces. I know its theoretically possible, since most 3d modeling programs have this feature, and also the sphere() object uses this.
Is there a way to add smoothing between and arbitrary set of adjacent polygons?

any hints would be really appreciated!

regards,

Henrik
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JohnG
Re: smooth polygon faces
Reply #1 - Apr 11th, 2006, 2:06pm  
What you need to do is set the normal() for each vertex, in such a way that the adjacent polygons that share a vertex, use the same normal for it.

The normal is a 3D vector that is perpendicular to the surface. so even though a polygon is flat, you cna set one of the normals to be slightly different, and it'll be interpreted as being a curved surface when it comes to lighting the polygon.
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Henrik
Re: smooth polygon faces
Reply #2 - Apr 11th, 2006, 3:19pm  
Thanx, that makes sense!
just a little detail: do i call normal() before or after i call vertex() to assign the normal vector?

Henrik
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JohnG
Re: smooth polygon faces
Reply #3 - Apr 11th, 2006, 4:33pm  
You call it before, and it sets the normal for all the following vertex() calls, until you call normal() again I think.
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Henrik
Re: smooth polygon faces
Reply #4 - Apr 11th, 2006, 7:01pm  
great! thanks alot!
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