My experiments, with source files

[ikoon]

Hello, I am putting my experiments and RnD here: http://lab.ikoon.cz/
Maybe you will find some inspiration there. Source files and URLs are included.

[stickman]

wow. Inspired. Thanks!

[ikoon]

All I can do in Houdini is thanks to other people, who are helping and sharing their knowledge. Thank you everybody. You guys rock! That page is also my "Thank you!"

[vinsonlws]

thank you!, it help me a lot!! thank you thank you thank you!

[ikoon]

Vector Quantization, Curl Noise, Dot Product
I was inspired by entagma and Thomas Dotheij
Download my source .hiplc here:
http://lab.ikoon.cz/post/153855061629/vector-quantization-curl-noise-dot-product

 

[ikoon]

I have added animated version source to the same link:
http://ikoon.cz/client/files/houdini.lab/031-o-vector-quantization/

 

[stickman]

Thanks for sharing. This is very inspiring!

[Federico]

Thanks for the sharing! They are really helpful and inspiring.

[ikoon]

Three velocity volumes (pyro explosion and collision + SDF gradient + curl noise). Source .hiplc files here: http://www.ikoon.cz/client/files/houdini.lab/032-o-vel-surface/

[deniz]

nice implementation, after thomas help, i got these triangle forms, his research is quite nice about quantization Thomas Dotheij R'n'D November 2016 : Vector Quantization

computer vision seams pretty interesting

 

Edited December 7, 2016 by deniz

[theWingedPlatypus]

Always nice to see that you're work inspire nice pieces of art !

thanks for the quote ! (both ikoon and deniz )

keep up the good work !

 

Cheers

[ikoon]

I am quite happy with my new algorithm. Just pure math - no noise, no random, no simulations. Vector algebra to find curvatures around any mesh. Unfortunately any deforming mesh is per-frame flickering, so still in progress. .hiplc files here:
http://www.ikoon.cz/client/files/houdini.lab/033-o-peak-algebra

Edited December 14, 2016 by ikoon

[Atom]

Thanks for the example files!

So how do you render these? When I render out of Mantra I big and horsey lines. Also there is no animation when I scrub the timeline. Is there some node parameter that needs to be animated to cause the lines to move?

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.

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Ok, after playing around with the scene I discovered you can add an AttributeWrangle to the end of the network and simply set the f@width attribute for the strand width rendering under Mantra.

Edited December 14, 2016 by Atom

[ikoon]

Hello Atom, I am only solving those curvatures ... I generate volume velocities by generating new vectors as a cross product of "intersecting normals". Unfortunately those intersecting normals are jittering a lot on a deforming mesh. It is like solving two hugging hedgehogs I will have to do more development, when I have time. My hiplc is far from perfect, I just wanted to share it.

As regards rendering. You could use also @pscale and here are nice tips to render lines:
(hair normals, cca 14:00 minute) https://vimeo.com/184145249
(additive mode) http://forums.odforce.net/topic/27668-mantra-glowing-points-and-fake-dof-fake-light-emitting/?do=findComment&comment=158515

[ikoon]

Here I attach an example. There is a for-each-loop for every trail to generate custom pscale and color ramp along the trail.

trails - scale and color.hiplc

[ikoon]

As regards those pscale and color ramps along the trails, there is much faster way to compute:
Texture UV (Type: Rows&Columns, Class: Point) - gives you the u attrib along the trail
Point VOP (the UV attribute > Vec to float (u) > Ramp)

I have used it in my Houdini project here, along with other effects and simple networks:
motion-graphics-project-with-source-files

 

[ikoon]

It's been a year since I wrote the last note here. But I am still maintaining my little blog and trying to publish little tools and snippets. It is not well documented, excuse me. But I hope that it may help some of you, or serve as inspiration:

http://lab.ikoon.cz/

Edited February 6, 2018 by ikoon