Alan, this is a great start-up help you have given, my appreciation! I
started already to make experiments with it.

Still, there is something I need to know:
I want that the media covers up a sphere, let's say, of a radius of 1
unit. Just outside that 1-unit-radius sphere, the density should fade
down to 0.0 at a distance of 0.3 units to the outside of that sphere.

That means, the density does not decrease constantly from center to 1.3
units away. How can I implement it this way?

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