Given a hemispherical surface, the challenge is to create a parametric normal plane (driven by azimuth [sets `longitude'] and zenith [sets `lattitude'] angles) with the smallest possible number of features or construction elements. The set of features will possess an axis which forces the normal reference plane.
One solution is illustrated below. I suspect there is a simpler way.
Thanks in advance for any constructive suggestions (pun intended).
I'll do the same with 2 2D sketches.
More stable.
Can you elaborate on this, Frederick?
One sketch for 130 deg.
One for 50 deg.
I found 3D sketches cause problem down stream.
Features could rotate when the sketch change.
Frederick Law wrote:
Features could rotate when the sketch change.
They should rotate when the sketch changes. I have never seen any non-parametric changes in 3D sketches, any slips not in the user's control. They are reliable and show design intent clearly, what with the numbers residing in one step. In my opinion.
I had something similar a while back and used 2 offset planes and a 3D sketch to define the line endpoint by simple formulas in a design table. The offset plane distances are included in the formulas which makes various line endpoint positions 100% flip proof for any quadrant.
You might use a 3D sketch.