From TOI-Pedia

Surfaces > planar 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:

  1. the lines need to connect or intersect (no gaps between them)
  2. the lines need to be planar (flat).

Planar menu.jpg

Planar solo procedure.jpg

Planar procedure.jpg

more information and problem solving on the planar command

Problem solving

Creating planar surfaces may fail for various reasons.

Note that the geometry node for the surface is still created despite of any errors that prevent the surface from showing. When you get a failed to compute error, undo the last action or fix the problem immediately. In this last case you don't need to select the planar command again; the surface should appear automatically once the problem is fixed.
  • Curve(s) not closed

Planar failed opencurve.jpg

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:

Curve AE form open.jpg

Solution: close the curve. Either manually (using point or curve snap), or using Edit curves > Open/Close curve.

  • Curves are not planar

Planar failed nonplanar.jpg

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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