Reply To: FIXED: Hole visible in multi-res & Silly Bug

[naiad]

I recently discovered that the spikes can be generated even without using multires modifier. 

Let’s take a look at the following example:

The eyebrow made by a separate mesh is shrinkwrapped on the un-retopologized head.

The small spikes are generated after adding loop cuts on the eyebrow mesh as the following screenshot shows:

Now, let’s select the head and go to the Sculpt mode and turn on the Dyntopo. Use Draw or Simplify brushes to remesh only the area where the spikes occur. After that, go back to the Layout or Edit mode, and the spikes are gone. (If they are not gone, then repeat the process several times.)

My Conclusion:

In my cases, the spikes are caused by:

1, the algorithm of the Shrinkwrap;

2, the haphazard locations and shapes of the polygons from the head; 

3, the relatively denser loop cuts of the eyebrow mesh.

The spikes can not be generated if any one of the three causes is eliminated in my case.  

Lastly,