After creating a cube in the global orientation, is it possible to quickly align it with an axis of a custom frame of reference?

Use: Align rafters with the roof slope for which a custom orientation has been defined:

enter image description here

Simple 'cube' which longitudinal axis should be aligned with Z of the Roof frame of reference

  • $\begingroup$ have you tried to snap the second object? with Face option and all other options enabled, and its origin on one of its faces $\endgroup$ – moonboots Aug 25 '18 at 20:41
  • $\begingroup$ I gave you a trick that could work (snap tool), maybe this video could also answer your question (don't know): youtube.com/watch?v=0pfTDzAaXp4 $\endgroup$ – moonboots Aug 26 '18 at 11:06
  • $\begingroup$ I prefer your solution to the one in the video, there is no hook to create and then remove. $\endgroup$ – mins Aug 26 '18 at 11:20

Tell me if this is what you want:

  • Create you first object and rotate it.
  • Create your second object, put its origine on its base (with Cursor to Selected then Origin to Cursor).
  • Activate the Snap tool of your horizontal menu bar, choose Face mode, enable all options.
  • Grab your second object, it will snap on the surface of the first one.
  • You can assign an Array modifier to your object so that it duplicates along.

enter image description here

  • $\begingroup$ Ah yes, this is a great tip! The second option (Project individual elements on the surface of other objects') mustn't be activated for a source face to snap on a target face. $\endgroup$ – mins Aug 26 '18 at 11:17

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