Need to change pivot points during animation

Question

First of all sorry for my english.

I create an animation of duplicating triangles that are ultimately to create a shape. Triangles are created by rotating around a vertex or edge. The problem arises when the first group of triangles appears (dark gray in the picture) and I would like the shape to grow. To achieve this, it is necessary to change the pivot point.

How can this be done?

Answer 1

If what you want to do is a series of rotations for your triangle, what you could do is use Child Of constraints with some empties:

• Create an empty at the first pivot point of the triangle, give your triangle a Child Of constraint with the empty as Target, press the Set Inverse button, keyframe the empty:

• Rotate the empty, keyframe the rotation, put the 3D cursor on the second pivot point, create an empty, give your triangle a second Child Of constraint with this second empty as Target and Set Inverse, keyframe this empty:

• Rotate this second empty, keyframe.