hou-cops – Page 5 – Houdini-and-Chill

Archived post by mattiasmalmer

very interesting. I do not use that. i use a variant of laplacian image blending
posted about it here: discord.com/channels/270023348623376395/1260727356746764308/1342984912009171025

Here is another really useful color corrector.
It has the usual hueshift stuff.
but it is the along/perp stuff that makes it really neat. You select a direction. (say the classic teal and orange) then you can increase saturation along that axis and reduce it in the perpendicular axis. then if the image it too orange you shift the whitepoint towards orange to get the teal orange balance more centered.
I made this one for nuke a long while ago and use it very often. So here it is now for houdini! thanx to @jake rice 😮 for pushing sideFX to fix the mat3inv() function 🙂

Attachments in this post:
http://fx-td.com/houdiniandchill/wp-content/uploads/discord/20252405/18/25/hueX.hiplc
http://fx-td.com/houdiniandchill/wp-content/uploads/discord/20252405/18/25/houdini_G1YdcSydnd.mp4
http://fx-td.com/houdiniandchill/wp-content/uploads/discord/20252405/18/25/cop_Mattias.hueX.1.0.hdalc

Archived post by mattiasmalmer

here is a little cops setup for making any image tilable.

Attachments in this post:
http://fx-td.com/houdiniandchill/wp-content/uploads/discord/20252005/17/25/houdini_j6bKUQSv0h.gif
http://fx-td.com/houdiniandchill/wp-content/uploads/discord/20252005/17/25/make_tilable.hiplc
http://fx-td.com/houdiniandchill/wp-content/uploads/discord/20252005/17/25/make_tilable.rop_image1.0001.jpg

Archived post by mattiasmalmer

yeah the lack of iterator is a bit of a bummer.

here is a really neat color corrector I have been working on.

Attachments in this post:
http://fx-td.com/houdiniandchill/wp-content/uploads/discord/20251605/15/25/colorX.hiplc
http://fx-td.com/houdiniandchill/wp-content/uploads/discord/20251605/15/25/cop_Mattias.colorX.1.0.hdalc
http://fx-td.com/houdiniandchill/wp-content/uploads/discord/20251605/15/25/image.png

Archived post by mattiasmalmer

simple little gem:
a rolloff you can use in your slap comp to get control over your highlights
“` #bind layer src? val=0 #bind layer !&dst
@KERNEL { float4 color=@src; float alpha=color.w; color=1-exp(-color); color.w=alpha; @dst.set(color); }
“`

Archived post by sniperjake945

Here’s the pighead paint cop thing. I swapped all my textures for the brush strokes to ones that i made in cops. and then i’ve also commented all of the paint stroke splatting code. It’s not hyper optimized, this is again a dumb approach where i strictly stay in COPs for everything. It’s way easier and better to do some of this stuff in sops.
if i catch you using this without modification on a commercial project i will make fun of you for forever, and i will ban you from the server 🙂

@jan1376 @flight404 have fun fellas

Attachments in this post:
http://fx-td.com/houdiniandchill/wp-content/uploads/discord/20254905/02/25/image.png
http://fx-td.com/houdiniandchill/wp-content/uploads/discord/20254905/02/25/JR_cops_painting_v0001.hip

Archived post by sniperjake945

@eetum you dont need a wrangle, no 😮 but that’s a fun aspect of OCL in cops ive never looked at.
I just whipped up a VAT example for my class, here’s the file. It directly reads attributes from the geometry input.
the file also shows how to read from this cruddy VAT texture to apply the animation back onto the demo geometry (in this case a pighead)!

Attachments in this post:
http://fx-td.com/houdiniandchill/wp-content/uploads/discord/20255004/01/25/JR_openCL_VAT_example.hip
http://fx-td.com/houdiniandchill/wp-content/uploads/discord/20255004/01/25/image.png