Transition

Note: This feature is under development. The command to enable or disable features under development is:

Set Developer Commands {On|OFF}

Applies to: Surfaces

Summary: Produces a specified transition mesh for specific situations

Syntax:

Surface <range> Scheme Transition {Triangle|Half_circle|Three_to_one|Two_to_one|Convex_corner|Four_to_two} [Source Curve <id>] [Source Vertex <id>]

Discussion:

The transition scheme supplies a set of transition primitives which serve to transition a mesh from one density to another across a given surface. The six transition sub-types are demonstrated here.

 Scheme Transition Triangle creates four quads in a triangle that has sides of three, two, and one intervals. Scheme Transition Half_circle creates three intervals on the flat and three on the curved part of the half-circle, then creates four quads in the surface. Scheme Transition Three_to_one creates four quads on a rectangular surface that has intervals of three, one, one, and one on its sides. Scheme Transition Two_to_one creates three quads on a rectangular surface that has intervals of two, two, one and one on its sides : Scheme Transition Convex_corner takes a six-sided block with a convex corner and connects that inner corner to the opposite one, creating two quads on the surface. Scheme Transition Four_to_two creates seven quads on a rectangular surface that has intervals of four, two, two, and two on its sides.

The user also has the option of specifying a source curve and/or a source vertex. The rules for these specifications are as follows

• If both a curve and vertex are specified, the vertex must be on the curve.
• The Convex_corner sub-type does not allow a source curve.
• The Four_to_two sub-type does not allow a source vertex.
• The source curve will be the curve that will be given the fewest intervals.
• The source vertex will specify which corner will be used for the scheme, in cases where this makes sense (primarily in the Triangle, and Two_to_one cases).
• If none of the optional information is given, the program will assign the source curve to be the shortest one on the face, in keeping with the most probable