Trelis 16.4 User Documentation
The collapse operation allows the user to collapse small angles using virtual geometry.
To collapse small angles
Collapse Angle at Vertex <id> Curve <id1> [Arc_length1 <length>] Curve <id2> [Arc_length2 <length> | Same_size | Perpendicular | Tangent] [Composite_vertex <angle>] [Preview]
The collapse angle command is used to eliminate small angles at vertices, where curves meet at a tangential point. The command will split each curve at a specified distance (?1 and ?2 ) as shown in Figure 1, and create two new vertices along those curves. The remaining small angle will be composited into its neighboring surface using virtual geometry. The options of the command allow you to specify where to split each curve. You must input a distance for the first curve ( ?1), but the second location can be determined based on the length and direction of the first curve.
The arclength option will split each curve at a specified distance ?1 and ?2, (See Figure 1) measured from the vertex. You must input at least one arclength for each of the options listed below.
The same_size option will split curve 2 so that the two resulting curves, ?1 and ?2, are the same length as shown in Figure 2.
The perpendicular option will split curve 2 so it is perpendicular to the split location on curve 1, as shown in Figure 3.
The tangent option will split curve 2 where a line tangent to curve 1 at the split location intersects curve 2, as shown in Figure 4.
The composite_vertex option automatically composites resulting surfaces if there are only two curves left at the vertex, and the angle is less than a specified tolerance.
The preview option will preview composited surface before applying changes.