[Solved] Color by face normal.

Forums Houdini Indie and Apprentice [Solved] Color by face normal.

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Jaggerwock: Member; 10 posts; Joined: Sept. 2016; Offline

Oct. 24, 2016 1:29 p.m.

Hi !
I'm on a project where I need to colorize primitives according to its inclination (see the image below, it must be easier to understand) , but I really don't know how to do that. Can you help me ?

(the model and its material was made on Maya )

Edited by Jaggerwock - Oct. 27, 2016 05:34:05

Attachments:
Jellyfish.gif (2.5 MB)


mestela: Member; 1737 posts; Joined: May 2006; Online

Oct. 24, 2016 6:13 p.m.

Here's a way of doing it in sops, if you only need it at render time I'm sure it'd be easier still just using shaders and fresnel vops.

Edited by mestela - Oct. 24, 2016 18:13:35

Attachments:
facing_ratio_prims.hip (240.4 KB)
facing_ratio_prims.gif (492.0 KB)

http://www.tokeru.com/cgwiki [www.tokeru.com]
https://www.patreon.com/mattestela [www.patreon.com]


Jaggerwock: Member; 10 posts; Joined: Sept. 2016; Offline

Oct. 25, 2016 5:07 a.m.

Wow, thanks a lot !
The fresnel way won't render in viewport isn't it ?

Edit : I have an issue while trying your method with dynamics, the color adapt the movement do with the transform, but not the simulated one.. any clue ?


mestela: Member; 1737 posts; Joined: May 2006; Online

Oct. 25, 2016 6:14 a.m.

Yes, it won't update in the viewport. You could probably write your own GLSL viewport shader if you wanted, but thats probably more effort than you need.

It should work with dynamics fine. you're doing the dynamics/deformation first, then feeding it through the setup right?

Attachments:
toy_displace_fresnel.gif (1001.4 KB)
facing_ratio_prims_deform.hipnc (1.5 MB)

http://www.tokeru.com/cgwiki [www.tokeru.com]
https://www.patreon.com/mattestela [www.patreon.com]


mestela: Member; 1737 posts; Joined: May 2006; Online

Oct. 25, 2016 6:19 a.m.

btw, it's a lovely design you've setup, I can't stop playing with it.

Attachments:
head_displace.gif (1.6 MB)

http://www.tokeru.com/cgwiki [www.tokeru.com]
https://www.patreon.com/mattestela [www.patreon.com]


Jaggerwock: Member; 10 posts; Joined: Sept. 2016; Offline

Oct. 25, 2016 8:14 a.m.

Ahah, thanks !
I use a wire simulation, and I still don't manage to make it work. If I put it before the dop import, the colors do not change with the simulate animation, and obviously if I put it after, the colors don't even appear.


mestela: Member; 1737 posts; Joined: May 2006; Online

Oct. 25, 2016 8:46 a.m.

you might have to upload a hip file so we can see what you're doing.

http://www.tokeru.com/cgwiki [www.tokeru.com]
https://www.patreon.com/mattestela [www.patreon.com]


Jaggerwock: Member; 10 posts; Joined: Sept. 2016; Offline

Oct. 25, 2016 9 a.m.

Oh yes sorry !
I'm just trying to make this effect work on wire simulation.

Attachments:
wiresColor.hipnc (1.5 MB)


mestela: Member; 1737 posts; Joined: May 2006; Online

Oct. 25, 2016 9:36 a.m.

Ok, in that scene you deleted all the nodes that did the colouring, and you weren't bringing the deformed mesh back from the dopnet into your network.

I've attached a fixed version.

Attachments:
wiresColor_fixed.hipnc (1.5 MB)

http://www.tokeru.com/cgwiki [www.tokeru.com]
https://www.patreon.com/mattestela [www.patreon.com]


Jaggerwock: Member; 10 posts; Joined: Sept. 2016; Offline

Oct. 27, 2016 5:33 a.m.

It was on purpose, I didn't knew how to reimport the dropnet, but now I know

Thanks a lot for your answers !

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