Coating material tests

[lycium]

Perhaps relevant is chapter 3 of these course notes: http://mesh.brown.edu/3DPGP-2007/pdfs/sg06-course01.pdf

[OnoSendai]

I'm tempted to see what you guys (CTZn and Galinette) can achieve with a curvature function in ISL, so I'll try adding it in soon

[CTZn]

I'm tempted to see what you guys (CTZn and Galinette) can achieve with a curvature function in ISL, so I'll try adding it in soon

May your hand not tremble in doing so.

The last time I've been thinking at that feature was while doing the liquid coating. Accessing curvature data can be considered as an ancient request

[CTZn]

Thanks Tom !

The next one can get real creepy sometimes... noise fun.

Some physicist comment:
It's too visible that you only use the normal for computing the thickness. This leads to some undesirable effects:
- The sharp angles show a sharp change in thickness
- The top flat part of the base has virtually nothing on it, while it should be one of the thickest (it's at the bottom, plus it's lying flat so the liquid should not flow from it

Some more advanced shader could make use of the altitude as well as the normal. [...]
Sorry for criticizing, that's looking very good (and scary )

Cheers,

Etienne

It's clealy an artistical approximation, vehiculating the idea that some fluid that was around ended below eventually.

I did not even test the material on a different mesh, it was really made against a sphere and is expected to work best on closed, smooth shapes. The use of 2*Pi in the power illustrates that over-adaptation of the shader to the one mesh. Again, I just eyeballed that 2*Pi couldn't be wrong against a spherical thing, period

Now, it belongs to me to discriminate between what is a positive criticism and what's not. I'm litterally hungry for the former. You'll never profess the other kind without me telling you, and irritably enough I can defend myself

Everyone here should know that my authority is all symbolical (it's a badge) and that I'm sad that many don't dare to criticize up to my doings. Mark my words and thank you again !

[CTZn]

The use of 2*Pi in the power illustrates that over-adaptation of the shader to the one mesh. Again, I just eyeballed that 2*Pi couldn't be wrong against a spherical thing, period

See how I can say stupid things at time ? No one cares

There's in fact no relationship between the shape of the mesh and the way Pi is used in that shader. That non-sense illustrates my abscence of background in physics.

[OnoSendai]

Gaussian curvature:
Red = positive curvature, green = negative curvature.

[OnoSendai]

A test with the coating thickness based on Gaussian curvature.

It kind of works in this case, however I don't think Gaussian curvature is the right curvature metric to use for this kind of thing, because a crease in a flat surface will have zero Gaussian curvature.

[galinette]

A test with the coating thickness based on Gaussian curvature.

It kind of works in this case, however I don't think Gaussian curvature is the right curvature metric to use for this kind of thing, because a crease in a flat surface will have zero Gaussian curvature.

Yes, we need the sum of curvatures and not the product

[StompinTom]

Woo. Easy dirt shader?

[lycium]

Yes I was thinking this too! Add some FBm / noise, and suddenly you have your worn crevices shader!

[CTZn]

Worn edges is indeed the primary shading application of curvature evaluation !

[galinette]

Hey, why did nobody request for this before I did

[Zom-B]

Hey, why did nobody request for this before I did

Our requests are less to the point, but more of "make that magic happen" kind of stuff

[OnoSendai]

There has been a somewhat similar request for an ambient occlusion pass/info, which is a lot more complicated.

[FoXar]

There has been a somewhat similar request for an ambient occlusion pass/info, which is a lot more complicated.

Nice materials! Can't wait to try and make a fruit pie with a nice jelly coating on top of it

About that ambient occlusion, I'm still holding you on that one! Would finally make those mouldings and finer details pop a bit more.