How do I set mesh smoothing groups programatically?

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So basically, I'd like to create a voxel based game in Unity. A problem that I'd like to solve before I begin is how to create smoothing groups and edit them on a mesh in unity. I'm sure it's possible, since the video I saw of Castle Story - http://www.youtube.com/watch?v=NwZdXRPeYrc - has a voxel system that seems as if it has programatically created smoothing groups on it's hill blocks. I'd like to know how they've achieved this. Thanks in advanced! :D

Additionally, I do know how to create smoothing groups in Maya or 3ds Max and then import them, this isn't what I'm after. I want to know how to edit the mesh's smoothing groups INSIDE Unity.

Answer 1

Answer by brycedaawg · Aug 12, 2012 at 02:54 PM

Okay, so it turns out vertex normals can be used to manipulate the lighting on a mesh's triangles just the same as smoothing groups in 3ds Max or Maya do. A GameObject's mesh's normals can be accessed via a C sharp script using 'GetComponent().mesh.normals'.

Here's a link to the script reference: http://docs.unity3d.com/Documentation/ScriptReference/Mesh.html

and here's a quick explanation of how vertex normals work: http://3dengine.org/Vertex_normal

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How do I set mesh smoothing groups programatically?

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