Need Help closing BAD GEOMETRY open poly-surface

[Kaamil_Hasan_Dahodwa (Kaamil Hasan Dahodwala)]

Hi, I have this Object, that is kind cut off due to a bad trimming operation, what would be the best and fastest way to “cap” this object or would I have to redraw it. I would like to make it a closed polysurface.

I have attached the files if anyone would like to take a look:

FILE-RHINO7.3dm (18.9 MB)
FILE-RHINO8.3dm (18.9 MB)

[litwinaa (Andy)]

Hello Kaamil,

On my end in R8 cap will not work. But even if it did, Tom:

Boolean Question

Hello Drew, On my end, in R8, I was able to run the cap command that closed the object and then successfully run the boolean difference. I do not know why this worked or seems to have worked. Thank you, Andy

Suggests caution with using the cap command [I reviewed the command in the help file, but still am not clear as to what the exact nature / explanation of technical problem one might introduce with using the cap command is and why.]

With the Show Edges command I see:

Command: _ShowEdges
Found 114 edges total; 14 naked edges, no non-manifold edges.

I believe one could rebuild these areas and have the final result be a closed object. However, given that your tolerance is set at 0.001 inch, I suspect that you want a significant degree of precision. So perhaps best to redraw the object ?

Thank you,

Andy

[Helvetosaur]

Your object is not bad, just open. Cap does not work because the openings are not planar.

As it’s mostly a simple extrusion, I would probably just remake the whole object as follows:

• First, determine the diagonal trim plane you want and create a plane surface there (pink).
• ExtractSrf the “notch” surfaces (cyan) plus the bottom surface.
• DupBorder the bottom surface and delete the surface.
• Cut off the funky ends and extend them cleanly beyond the trim plane (length doesn’t matter)

• Then re-extrude the bottom closed curve solid to the correct height.

• Trim the wall with the “notch” surfaces and join.
• BooleanSplit the walls with the diagonal trimming plane and discard the unwanted parts.
• Done.