Projection tries to match the position of vertices from one mesh to another. So a mesh is just a ton of vertices and each vertex is a point in 3d space. For example, 0,0,0 is the origin. 100,0,0 is 100 units in positive X direction. So if you have MeshA and you project it's details to MeshB here: you'd get: If MeshB didn't…
@goddessjuno There are many reasons why you would want to retop and project, but there are fundamentally two different cases you should be aware of. Each has a unique purpose and goal. Generally, you will be dealing with both. And a mesh that is optimal for one is not necessarily optimal for the other. Case 1: Sculpting…