Getting things flat in Rhino

Rhino
2

Dear James

you can set a custom c-plane to the original, green surface.
use the same 3 points as you used for orient3Pts.

the unprecision is already there
0.0000006

CPlane coordinates:
min = -0.0000003,0.0000000,-0.0000000
max = 70.4130670,37.9674815,0.0000006
dimensions = 70.4130673, 37.9674815, 0.0000006 inches

some thinks you might want to consider - or check the corresponding commands if you don t know them:

  • use Modelling-Aid planar
  • use project
  • use custom c-planes
  • don t use near snap, use single one-shot-snaps instead
  • commands like _cplane, _projectToCplane, _remapCplane, _setPt, _selPlanarSrf, _selPlanarCrv
  • do not change unit-Tolerance will modelling (at least don t make it more accurate)

use typical tolerances in the file - not sure if rhino feels comfortable with the 0.00000001 unit Tolerance in your file…
check this post

you may also want to read

and

EDIT:
Some stuff you might find below - kind of summary as this topic got unexpected long:

Summary

  • a very tight Unit-Tolerance is not recommended, typically use 0.001
  • _boundingbox might interact with display-meshes, if you really need a 0.00000…
    • use _ClearAllMeshes or
    • _reFreshShade
      before running _boundingbox, you can wright a macro for this and assign it to a button or to an Alias.
  • to fix 0.00000… use
    • _setPt
    • _ProjectToCPlane
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