Rigorous procedure followed by shape keys to merge models Good evening, I would like to know how the Blender shape keys realize the merging of two 3D models after the shrinkwrap modifier has been applied. What is the algorithm exploited? Does it use interpolation? Are there refernces?
Let's take an example. A plane projected onto some steps using shrinkwrap modifier:

We apply as shape keys.
And now, here is how the plane moves for several values for the shape key:

As you can see, this is linear.
If a vertex goes from X when shape key is 0 to Y when 1, then its position is:
X + &lt;shape key value&gt; * (Y - X)

Note that we take here shrinkwrap example, but shape keys go the same whatever the way they are produced from.