koobas.hobune.stream
Confining / Constraining an object transform trajectory to a mesh
Does Unity have any built-in support for confining/constraining the movement of Object A to being only on the surface of a non-planar mesh Object B?
I am not entirely sure if I understand your question. Do you want to constrain (player) movement along the surface of a mesh?
Yes - say, the player is Object A, is there a way to constrain / confine movement to just the surface of an arbitrary mesh Object B
No, there's no built-in support for this. (The behavior you describe is very specific and isn't the sort of thing Unity would be likely to support directly.)
However, the topic has been discussed quite a bit both here and on the forums, and if you search for e.g. 'mario galaxy' you should find some relevant threads. (In short, a fairly common solution is to cast a ray downwards relative to the object, and if there's an intersection, move the object to the intersection point and align the object with the surface normal at that point.)
