bareya.net

DLProcedural CVEX Shader update

bareya — Sat, 19 May 2012 14:30:30 +0000

I added new feature to DLProcedural and right now we are able to add point attributes at render time, so if you have forgotten about add pscale or whatever else – here is solution! Of course we can modify them by cvex!

DL is working with int, float, vector3, vector4, matrix3, matrix4 attributes.
If you would like to test it, ask me in person by email.
Cheers

Delayed Load Procedural CVEX Shader for H12

bareya — Thu, 17 May 2012 17:42:43 +0000

Little update, fixed bugs.

sphere modified by Perlin noise at render time

more info soon.
cheers.

Dependecy Link Colors in Houdini.

bareya — Wed, 21 Mar 2012 21:13:05 +0000

Today I built quite a big scene in Houdini. I was looking for dependencies so I turned on dependency links between nodes. In front of my eyes big bush showed up! Many links with the same colors, that was really crazy. I decided to change link colors!
I couldn’t find anything in the properities window, so I started looking for color scheme files.
I found them here:
$HFS/houdini/config/*.hcs
Usually I use Houdini Dark scheme, that’s why I replaced two lines in UIDark file:
NetworkWireExtraNormal: HSV 227 0.5 0.8 NetworkWireExtraActive: HSV 277 0.3 0.95
Right now I have beautiful colored bush
I hope you find it helpful.
Piotr

Delayed Load Procedural CVEX Shader

bareya — Thu, 27 Oct 2011 11:36:46 +0000

In the meantime of Happy Feet production I wrote my first DSO for Mantra, It’s my first tool written in HDK. The idea is very simple: Load geometry at render time and modify it by CVEX code. This version is a raw version, probably it has a lot of bugs, but I will try to make it better!

How to install ?
otl file goes to ${HOME}/houdiniX.X/otls/
so file goes to ${HOME}/houdiniX.X/dso/mantra/
VRAYprocedural goes to ${HOME}/houdiniX.X
That’s all!

What does it add to Houdini?
First thing is procedural shader called: Delayed Load CVEX. It’s available in the SHOP context.
Second thing is Delayed Load CVEX Global VOP node. It gives you an access to predefined global variables.

Special Global Variables:
We have two special variables: geometry and proceduralid. Geometry variable gives a string, which is a path to geometry leaded by delayed load. It’s a shortcut, we don’t have to create parameter node with expression between delayed load and CVEX shader. Proceduralid variable gives you an access to Procedural ID parameter on delayed load shader. But what is it for ? It can be useful when you would like to modify the same geometry with the same CVEX shader but with a different seed.

Google Code

Have a good fun!
Cheers,
Piotr

Fourier series in CHOPs

bareya — Sun, 14 Aug 2011 11:26:37 +0000

Yeah I did some Fourier Series in CHOPs, only for fun, how to play with integrals in chops.
I used this law to draw every harmonic function:

here are results:

Graph was mess, I know I should build it with for loop.

I am thinking to apply fourier series formula to geometry, idk what will happen, but it’s interesting.

I used this paper:

http://webpages.dcu.ie/~applebyj/ms224/BT2_FSER.pdf

Cheers,
Peter

Computed Tomography data in Houdini

bareya — Fri, 12 Aug 2011 09:43:27 +0000

Hey folks!
Yeah I did something awesome! I found some computer tomography(CT) images and I tried to visualize CT data in Houdini, here are amazing results:
First step is to find some CT data, this page:

http://digimorph.org/

it’s AWESOME for that, you can find there whatever you want

Here is my CT image sequence:

and here is data in Houdini:
one slice:

density:

and iso surface:

Other data, human body:

it’s for NON-COMMERCIAL purposes.
cheers,
Peter

Snell’s Law Wolfram Mathematica

bareya — Sun, 03 Jul 2011 15:48:53 +0000

Hey folks I have started adventure with Wolfram Mathematica. Amazing program for mathematical calculation and great tool for equations visualization.
I started from Snell’s Law, to learn expression language etc.

Amazing tool for everyone who love do something with math at everyday.
Cheers

Dr. D on sidefx website

bareya — Sun, 03 Jul 2011 14:58:04 +0000

You can find me on first photo near left edge, blurred ghost

Happy Feet 2 Trailer

bareya — Sun, 03 Jul 2011 14:54:15 +0000

Raytracing in SOPs

bareya — Fri, 17 Jun 2011 14:03:12 +0000

I was inspired by my friend from work. He did interesting ray tracing renderer inside SOPs. I decided to do the same thing, only to test myself.
There is no illuminance loop and it works only with one light, certainly, for loop will solve multiple light problem.
Cheers