clipka <ano### [at] anonymousorg> wrote:
>
> Isosurfaces? Surprisingly enough, while isosurfaces are the easiest way
> to already get what you are asking for (provided there is a solution to
> the problem at all), determining where the distance between the ray and
> the surface equals 'd' is outright impossible for generic isosurfaces.

Yes, I realize this is very hard when I tried to make a constant 'd' function on
a very simple example "y = ax^2 ".

https://www.flickr.com/photos/131379210@N05/17810168859/in/album-72157653310776535/

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