[sig.johnnson]

The surface pattern generator utility fails if the part name and the reference frame have the same name. To reproduce:
1. Start with the example workstation (attached)
2. Utilities > Surface Pattern Generator > Surface Pattern Generator
3. Use parameters:
Size along X = Size along Y = 100
Step along X = Step along Y = 5 
Cover all surface = Distribute lines evenly = Connect lines = False
Remove points that are not on the surface = True
Repeat times = 1
Repeat offset along Z = 2
4. Click "Ok"
5. Observe failure (snipped below)
6. Observe that part model has been deleted from workstation

Code:

The add-in application has stopped unexpectedly.

Executable: C:/RoboDK/Addins/com.robodk.app.surfacepatterngenerator/SurfacePatternGenerator/SurfacePatternGenerator.py
Returned code: 1

Error Output (stderr):
Traceback (most recent call last):
File "C:\RoboDK\Addins\com.robodk.app.surfacepatterngenerator\SurfacePatternGenerator\SurfacePatternGenerator.py", line 90, in <module>
runmain()
File "C:\RoboDK\Addins\com.robodk.app.surfacepatterngenerator\SurfacePatternGenerator\SurfacePatternGenerator.py", line 78, in runmain
new_obj = CreatePaths(REF, PART, S.SIZE_X, S.SIZE_Y, S.STEP_X, S.STEP_Y, S.REPEAT_TIMES, S.REPEAT_OFFSET, S.COVER_ALL, S.EVEN_DISTRIBUTION, S.CONTINUOUS, S.ANGLE_TRIANGLE, S.REMOVE_UNPROJECTED_POINTS)
File "C:\RoboDK\Addins\com.robodk.app.surfacepatterngenerator\SurfacePatternGenerator\_spgtools.py", line 191, in CreatePaths
pti_proj = Pose_x_XYZijk(pose_part_wrt_ref, proj_point)
File "C:\RoboDK\Addins\com.robodk.app.surfacepatterngenerator\SurfacePatternGenerator\_spgtools.py", line 32, in Pose_x_XYZijk
new_xyz = pose * xyzijk[0:3]
File "C:\RoboDK\Python\robodk\robomath.py", line 1513, in __mul__
raise Exception(MatrixError, "Invalid product")
Exception: (<class 'robodk.robomath.MatrixError'>, 'Invalid product')


Output (stdout):
Loading data from RoboDK station...
WARNING: Invalid/unknown parameter to get: Surface-Pattern-Generator-Settings-Backup
Saving data to RoboDK station...
Working with table ...
Projecting table to surface...
WARNING: Invalid points, a 3xN (or 6xN) list of points must be provided
WARNING: Invalid points, a 3xN (or 6xN) list of points must be provided
WARNING: Invalid points, a 3xN (or 6xN) list of points must be provided
WARNING: Invalid points, a 3xN (or 6xN) list of points must be provided
WARNING: Invalid points, a 3xN (or 6xN) list of points must be provided
WARNING: Invalid points, a 3xN (or 6xN) list of points must be provided
WARNING: Invalid points, a 3xN (or 6xN) list of points must be provided
WARNING: Invalid points, a 3xN (or 6xN) list of points must be provided
WARNING: Invalid points, a 3xN (or 6xN) list of points must be provided
WARNING: Invalid points, a 3xN (or 6xN) list of points must be provided
WARNING: Invalid points, a 3xN (or 6xN) list of points must be provided
WARNING: Invalid points, a 3xN (or 6xN) list of points must be provided
WARNING: Invalid points, a 3xN (or 6xN) list of points must be provided
WARNING: Invalid points, a 3xN (or 6xN) list of points must be provided
WARNING: Invalid points, a 3xN (or 6xN) list of points must be provided
WARNING: Invalid points, a 3xN (or 6xN) list of points must be provided
WARNING: Invalid points, a 3xN (or 6xN) list of points must be provided
WARNING: Invalid points, a 3xN (or 6xN) list of points must be provided
WARNING: Invalid points, a 3xN (or 6xN) list of points must be provided
WARNING: Invalid points, a 3xN (or 6xN) list of points must be provided
WARNING: Invalid points, a 3xN (or 6xN) list of points must be provided
Projection failed on some points!

This does not occur if the name of the reference frame is changed.

[Sam]

Good catch! I just fixed the Surface Pattern Generator Add-in in our public GitHub, and it will be updated on the online library soon.

[sig.johnnson]

Thanks for the quick turnaround, Sam!