"Chris R" <car### [at] comcastnet> wrote:

> That was actually the first approach I thought about; it's very similar to what
> Inigo Quilez proposes for doing repeating patterns of SDFs.

Where does he cover that?

> I had trouble
> visualizing how much variance it would introduce in the edges while introducing
> 27 calls to the pigment function at each point.  Did you find you needed to
> expand the box beyond the neighboring points, perhaps to 2 points out, which
> would be 125 calls to the pigment function to get a good gradient for shading?

I don't recall the specifics, as it was several years ago.
I'm not sure if I'm remembering or speculating post hoc, but I think the idea
was to simply establish what the gradient vector was, and then take several
samples along that vector. Then those samples were just averaged.

It seems like there was slightly more to it than that, possibly using the
bounding box of the object {} to govern the spacing of the samples...?

I'm really not going to know for sure until I somehow stumble upon my files.
If all else fails, I may just have to try and rewrite everything from scratch.

- BW

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