Non-uniform scaling an AcDb3dSolid in AutoCAD 2013 and higher

[tbrammer]

AutoCAD won't do a p3dSolid->transformBy(mat) if mat doesn't scale uniform.

Does anyone have an idea how to write a function that does non-uniform scaling of AcDb3dSolids?

This should be possible becaus an AcDb3dSolid can be bounded by NURBS-curves and -surfaces. These can be non-uniformly transformed.

It think this aproach should work:

1. use the BREP-API to extract NURBS-Data of the boundaries

2. create AcDbNurbSurface Entities using this data.

3. transform the AcDbNurbSurfaces with mat. (If transformBy() won't work just transform the NURBS-controlpoints)

4. create a new Solid with AcDb3dSolid::createSculptedSolid(nurbsSurfaces)

This might be very slow and / or not very stable (according to my exyperiences with createSculptedSolid()).

Has anyone tried this before?

Is there a better solution?

Cheers

--Thomas

[elshawadfy]

I'm still a biginner in programming.. But I found that the magic solution for any none uniform scaling, is to convert the object to block, scale it as i wish, then explode it.. programmatically this would require some after cleaning.. (deleting the unnecessary block dif., picking the new resulting entity...)