Extend the curve in the other direction. Make the shape bigger.
I have a starship model with windows and other openings. I made this by punching holes in a hollow shell via _BooleanDifference.
This only works with solid, closed cutters.
I made the cutters with ExtendCrvToPoint because you can see more window rim from all directions and I want that.
Now, I made this model some time ago and I rescaled the model from when it was last cut. I think I have lost the file with the cutters. I had a disk die and I didn’t backup to the cloud.
But I do have the cut model so the profile of the cutter is preserved, correctly scaled and moved in the empty hole in the cut model.
I can use Extend on straight lines in the cut profile to find the original extrusion point of the cutter.
So I can make an extrusion that starts from the outer hull to the extrusion point.
This leaves me with two problems.
- I’m not certain how to close (make solid) the extrusion. I picked the solid option but that failed perhaps because the curve is not planar.
- I might want to change the shape of the bottom of the saucer so it would be nice to extend the cutter to allow some wiggle room. <- This! so much this. I don’t want to be locked down on this.
I tried SetPt to flatten a copy of my curve. I picked the Z coordinate of the minimum point on the original curve and extruded it to point but my extrusion does not cut out the original curve. Close is a subjective opinion but, really, it isn’t close. I my extrusion is solid but I can see space around the extrusion when I look closely at the original curve.
This would all be a lot easier if I could just extrude the curve away from the point then use cutplanes to give me a flat, solid shape, that doesn’t punch out of the top of the saucer.
I have some renders here. If you scroll down you can see a bottom view of the model and you can see two “triangular” gray areas at 10 and 2 O’Clock on the bottom of the saucer section. Those are the problematic holes.