Choose one
of the following techniques to control fine displacement.
These help you avoid the risk of accidentally creating billions
of triangles until memory runs out, without juggling a large number
of displacement-mapping parameters.
When you use Fine approximation,
you must choose one of these techniques:
- view length
-
Specifies that all triangles
should be subdivided until they are smaller than edge pixel diagonals. The
edge value is typically around 0.5, or 0.25 or even 0.1 for very
high quality. This technique is recommended for all fine approximations.
- length
-
Specifies that the triangle
edge length should stay under edge units in the object's object space.
The edge parameter needs more careful tuning than in the view-dependent
case, and very high values defeat the purpose of fine approximation.
- parametric
-
Tessellates a free-form
surface such that all microtriangles have the same size. This results
in very regular meshes but is harder to optimize, and may use significantly
more memory.
This lets you define
triangle size as a fraction of the surface size, instead of in object
or screenspace mode.