Surfaces > creates a planar (flat) surface enclosed by one or more curves, isoparms or trim edges. Two conditions have to be met in order to create a planar surface successfully:
- the lines need to connect or intersect (no gaps between them)
- the lines need to be planar (flat).
more information and problem solving on the planar command
Creating planar surfaces may fail for various reasons.
- Curve(s) not closed
If the curve or curves aren't exactly closed, you won't be able to create a planar surface. There can't be any 'leaks'. To check if a single curve is closed (or periodical), you can check the Attribute editor:
Solution: close the curve. Either manually (using point or curve snap), or using Edit curves > Open/Close curve.
- Curves are not planar
If the curve(s) for you planar aren't absolutely flat (planar), you won't be able to create the surface.
Solution: If the curve isn't flat, you may be able to make it flat by scaling it to 0 in the desired direction. Or you could align all vertices using point snap to make the curve flat.
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