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On 11/17/24 21:52, Bald Eagle wrote:
> William F Pokorny <ano### [at] anonymous org> wrote:
>> On 11/17/24 06:51, William F Pokorny wrote:
>>> No attempt wrap the cylinder - just punching out a thin part of the
>>> crackle cell outlines.
>
> Huh. And what happens if you do the same sort of thing with something like the
> Stanford bunny?
>
If the aim is seeing the outlines rather than creating an isosurface
shape from them, the quick thing would be to create a pigment from the
crackle pattern set up to show outlines - the parts of the pattern not
outlines would be set transparent. Ignoring that we can define an inside
vector for a well formed / closed mesh, a mesh surface is already
infinitely thin for the purposes of sampling.
If you want to play with isosurfaces based upon a mesh, one of the
techniques to turn them into value fields would be the up front
approach. There are a couple SDL only ones. A method I posted in the mid
to late 2000s and one Sam B posted in the early 2010s. The yuqk fork has
hard_object{} and soft_object{} inbuilt features for turning shapes into
value fields / patterns.
The recent filling a shape with random noise approach might work for a
noisier result. There is too a way to pre-sample a shapes interior
saving the result as a df3 file which can then be used as a value
pattern suitable for an isosurface.
A straight intersection with a mesh having a clean inside region or any
object with an defined inside is an option too. The gradients will be
bad and the result, visually, less interesting as the outer layer of
cell outlines will hide everything to the interior.
Bill P.
Aside: I've wondered some what an intersection of two crackle value
pattern intersected might look like - where one crackle changes ip_seed,
is rotated or scaled differently such that the cells walls intersect
sparsely.
With the ip_strength option set up asymmetrically we might also be able
to define certain patterns or shapes. One crackle ip_repeat, repeating
differently than the other where both have identical ip_seed, seeds...
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