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Phong shading is a process which simulates the effect of smoothly curving lighting across surfaces which are actually flat. It is done by modifying the surface's angle at each step across the surface to smoothly blend in to the surrounding surfaces.
ArghRad's phong shading is very flexible. It is assigned to individual faces. Normally a face's light value is only used if the light flag is also set. To make ArghRad use phong shading on a face, give it a light value, but don't set the light flag. ArghRad will smooth that face together with all touching faces that have the same value. If the touching face has a different value, then it is considered a different curve. Think of this value as a "curve ID tag". You should try to use unique values for unconnected curves as that will speed up the compiling process.
Also see -chopcurve in the patches section.