VRay for Rhino Manual
In order for geometry to be
rendered, whether it be with V-Ray or in the veiwport, a mesh needs to be
created. Because Rhino uses NURBS instead of meshes for modeling all of the
NURBS geometry must be converted to meshes in order to even appear in the
viewport. The good part about using NURBS is that a different mesh can be
created from the same geometry; one which is very fine or another which is
Setting a Custom Render Mesh
Access Render Mesh settings by clicking on Rhino Options and under Document
properties clicking on Mesh. By default Rhino uses the preset Jagged & Faster.
While you are working on your model it is recommended that you use the Jagged &
Faster preset. However, when it becomes time to do render final images the
Jagged & Faster preset may not produce a fine mesh, which can lead to odd
To set a custom mesh click custom and the options below will become active
with whatever were the previous mesh settings. The most effective way to create
a mesh is by defining only a few of the parameters and letting Rhino figure out
the rest. First change all of values to 0 except Maximum distance, edge to
surface which should be set close to the tolerance value for your scene. Now set
one of two different parameters, Maximum angle or Maximum Edge length. The best
setting for Max angle is usually somewhere between 6 and 12. Maximum edge length
will depend on your scene, and usually works well for high detail scenes without
many large flat surfaces, such as jewelry. Beware of setting too fine of a mesh
as this may take a long time for Rhino to calculate. Below are two examples with
the mesh on the left and the rendered result on the right.
The images above are from a very course mesh. Notice how the handle and the
rim of the cup look jagged and odd. The images below are from a very fine mesh.
Now the cups appear completely smooth.