Trimmed to Untrimmed Surface

[miano]

If I have a four sided trimmed surface (as in the attached), is there some simple way to convert it to an untrimmed surface?
Problem Trimmed.3dm.zip (33.1 KB)

[lander (CAD CAM CNC)]

1. yes.

Problem Trimmed_emod.3dm (3.1 MB)

[kev.r (Kevin)]

This has worked for me in the past.

How do you rebuild multiple trimmed surfaces into untrimmed surfaces

In Rhino: Build a surface using the edges of the trimmed surface. Patch with the created surface as the starting surface and the trimmed surface as the target. Note that the surfaces can be drastically simplified while retaining accuracy. To create the starting surface: EdgeSrf using the trimmed edges as the input. FitSrf to simplify the new surface. To create points to fit the surface to: Mesh with the trimmed surface as the input. ExtractPt from the mesh. Do not use ExtractPt from the s…

-Kevin

[pascal (Pascal Golay)]

Hello - in this case not exctly super simple because the trims intersect but RefitTrim can be helpful.

1. DupBorder and explode the border curve
2. UntrimAll
3. ExtendCrvOnSrf the short end curve and use the result to trim
4. RefitTrim that same edge.
5. ExtendSrf the lower edge of the result
6. ExtendCrvOnSrf the lower curve and use the result to trim
7. RefitTrim that new trimmed edge.

-Pascal