Non-planar
Quad Polygon
Rendering is calculated per triangle. At that time, a shading (contour)
may collapse by a non-planar quad polygon. This problem doesn't happen
if much number of quad polygons is made. When a complicatedly curved
surface is made with the aim of low-poly, It is non-efficiency that
is modeled with a planar quad polygon. After all, it is most efficient
to adjust the angle of triangle polygon each manually.
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Triangle
Polygon
When a triangle polygon is made a basis, a complicatedly curved surface can be made of the small number of polygons than quad polygon. But, it thinks that it is difficult to make it by the triangle polygon from the beginning. Make it by the quad polygon to a certain extent, and divide (tesselate) it into the triangle after that, and construct the most suitable angle manually.
*A triangle polygon isn't suitable
for the subdivision surfaces modeling. |