I have developed a blob figure of a human.  I made a mouth by flattening
a sphere and giving it a big negative strength.

The problem is that this technique gives a ridiculously long render
time.  Most of the render time is spent on the mouth, where perhpaps a
dozen components (spheres) overlap.

What is the quickest-rendering ways to make a simple mouth on a blob
character?
a) negative blob components?
b) CSG?
c) Make a different-textured region show up (and is there a quick way to
do this)?
d) ?

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