Is there a way to auto update or reproject newly added vertices on a shrinkwrapped mesh? I am doing a retopology project where I am using a low poly mesh that is shrinkwrapped to the high poly reference mesh. I have Snap during transform enabled with the snap element set to Faces and Project individual elements on the surface of other objects enabled.

The trouble, as we know, is that when new points are added with the knife tool, the vertices don't automatically snap to the reference mesh until each and every newly added point is translated a tiny bit in order to get it to snap back on to the surface.

Is there an add-on or a trick to using Blender that will speed up this workflow or do I really have to manipulate every single added point to get it to snap to the surface after I add it?

PS - I figured out that if, after making the knife cut, I tap G then all the newly added verts seem to update. Did I find the only solution or is there something that will reproject newly added points automatically?
Q. What is the workflow to setup retopolgy with SubD in Blender?  

A.


Create your reference mesh:


In the Properties Editor> Object tab> Display panel set Maximum Draw Type to Solid.

Create your retopo mesh:


Create a plane as the beginning of your retopology mesh and name it.

Setup X-Ray for retopo mesh:


In the Properties Editor> Object tab> Display panel enable X-Ray.

Setup Sudivision Surface Modifier for the retopo mesh:


Add Subsurface Modifier.
Enable Adjust edit cage to modifer result icon.
Subdivisions level to 2 or whatever is desired.

Setup Shrinkwrap Modifier for retopo mesh:


Add Shrinkwrap Modifier with defaults.
Set the Target to the reference mesh.
Enable Adjust edit cage to modifer result icon.

Setup Snapping to Faces for retopo mesh:


In the 3D View header, enable Snap during transform and set the
Snap Element to Face but leave off Project individual elements on the
surface of other objects.

Setup a viewport material for the retopo mesh:


In the Properties Editor> Material tab, add a new material.
Give it color like bright green or whatever you desire.
Copy the material color (hover over it and press Ctrl+C)
Go to the Material tab> Settings> Viewport Color, hover over it and
paste (Ctrl+V).



Update: I discovered that if your shrinkwrapped mesh is misaligned in certain areas, a quick fix is to apply the shrinkwrap modifier and then add another shrinkwrap modifier and set it up again. All the misaligned points will be fixed without having to move them around individually in order to get them to update.