Jholsenback: 1 revision: Reference Migration Initial Load

2012-03-15T19:08:49Z

1 revision: Reference Migration Initial Load

Jholsenback: 1 revision: Initial Load (TF)

2012-03-11T22:27:06Z

1 revision: Initial Load (TF)

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[[Category:Objects]]
[[Category:Finite Patch Primitives]]
{{#indexentry:smooth_triangle, keyword}}
{{#indexentry:keyword, smooth_triangle}}
The <code>smooth_triangle</code> primitive is used for just such purposes.
The smooth triangles use a formula called Phong normal interpolation to
calculate the surface normal for any point on the triangle based on normal
vectors which you define for the three corners. This makes the triangle
appear to be a smooth curved surface. A smooth triangle is defined by
<pre>
SMOOTH_TRIANGLE:
smooth_triangle {
<Corner_1>, <Normal_1>, <Corner_2>,
<Normal_2>, <Corner_3>, <Normal_3>
[OBJECT_MODIFIER...]
}
</pre>

where the corners are defined as in regular triangles and <code>
<Normal_n></code> is a vector describing the direction of the
surface normal at each corner.

These normal vectors are prohibitively difficult to compute by hand.
Therefore smooth triangles are almost always generated by utility programs.
To achieve smooth results, any triangles which share a common vertex should
have the same normal vector at that vertex. Generally the smoothed normal
should be the average of all the actual normals of the triangles which share
that point.

The <code>mesh</code> object is a way to combine many <code>triangle</code>
and <code>smooth_triangle</code> objects together in a very efficient way.
See [[Reference:Mesh|:Mesh|Mesh]] for details.

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