After reading some tutorials and viewing examples I thought I understood
isosurfaces, however when trying to create them myself, I run into problems.

I understand that function {(x*x + y*y + z*z - 1)} would create a sphere, but
why doesn't function {(x*x + y*y + z*z + 1)} (plus instead of minus)?

According to my reasoning it should generate exactly the same sphere, using plus
or minus should not make any difference in this formula, it only mirrors the
coordinates which results in the same sphere right?

What am I missing?

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