This is a little cylinder I want to fit into the exact centre of joint of icosahedra. How to make proper constrains?
- Distance from cylinder to each bend must be equal
- Central axis of cylinder should be normal to circumscribed sphere.
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2 Answers
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You can get there in three steps:
- Select inner faces of the joint
- Co Mesh > Snap > Cursor to selected (3D cursor is the center for new objects)
- Add a cylinder with six sides - it will be precisely in the middle
answered Jun 3, 2020 at 14:03
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$\begingroup$ Thank you for response, make case is slightly harder. Bends are not in the same flatness. They form a sphere dome. With you instruction i can make only one part of what i want. $\endgroup$– kybJun 3, 2020 at 16:08
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Maybe taking a step back.. if so, apologies..
- Enable the shipped Add-on 'Add Mesh: Geodesic Domes', create desired dome.
- On a copy of the dome, X > Delete Only Faces (The instancer can be set not to render, anyway)
- In its Instancing panel, set to Verts, and Align to Vertex Normal
- Parent your cylinder to the dome. The cylinder's mesh will need to be aligned along its local Y axis in Edit Mode.
- On the other copy, ShiftCtrlB bevel the vertices
- Again, delete faces.. select one of the new short edges and Shift G Select Similar > Length
- Delete those, and Object > Convert the remainder to a curve.
- Set the curve's U resolution to 1, and use its native Bevel, also at the lowest resolution, to give a square profile to the spars.
- Convert back to a mesh if desired, and combine the copies.
... something along these lines? Tweak, take the bits which serve your purposes?
answered Jun 3, 2020 at 17:59
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$\begingroup$ Phew dodged a bullet almost posting same (well dupliverts part) but so much lesser (you are a master illustrator) answer here blender.stackexchange.com/questions/181117/… Worth mentioning the instances are aligned local Y axis to vert normal? $\endgroup$ Jun 3, 2020 at 20:20
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$\begingroup$ @batFINGER :) Done. This is counter-intuitive, at least, to me. I really would have expected it to be Z? There's usually a consistent grammar to these things in Blender.. I must just not have twigged, yet. $\endgroup$ Jun 3, 2020 at 21:05