On 2025-03-13 15:47 (-4), Bald Eagle wrote:
> William F Pokorny <ano### [at] anonymousorg> wrote:
> 
> 
>> Interesting. This is an approach different than I've seen for
>> establishing a gradient about the surface of an object. Wondering some
>> about how the scaling is handled in detail. I've put it on my list to
>> review your code. Thank for making it available!
>>
>> Bill P.
> 
> Yes, I thought so too.
> I remember doing something with f_r (), and creating an artificial gradient
> across the hard boundary of the object pattern - but I've looked for the past 2
> days and haven't found the file or render where I did those experiments.
> 
> I'm pretty dure that I discussed the details with you though - in reference to
> your object-as-isosurface project.

I came up with a method a few years ago.  It uses trace() to find the
distance to the edge of an object from voxels in a vertical plane, and
creates an image map with the desired gradient.  You can use the pigment
function in an isosurface.

  https://github.com/CousinRicky/IsoBevelTut

There are a couple of issues:
 - Creating the image for the pigment function is a slow process.
   However, you only have to create the image once.
 - No matter the resolution, there will always be hard boundaries at the
   pixel level.  The interpolate option in the image map can mitigate
   this in some cases.

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