Experiments..

General questions about Indigo, the scene format, rendering etc...
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OnoSendai
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Re: Experiments..

Post by OnoSendai » Fri Dec 27, 2013 10:49 am

fbrunell wrote:
OnoSendai wrote:A new cloud render!
I've implemented some fancy new techniques that are helping to speed up volumetric rendering (for non-uniform densities). This particular cloud is actually using voxel data (200x200x200 grid).
Hello Ono,

I've been searching like hell in the blogs to find out how you did that cloud. I'm trying to create a small cloud sitting on the floor (don't ask, it's for a network diagram) and I couldn't find any material nor any information on the scene setup (object, etc.). Is it possilbe to reproduce through Blender?

Have you ever been able to document that scene/material?
Hi fbrunell,
You won't be able to replicate the cloud render yet because the code is not released. It requires voxel support and some other stuff.

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Re: Experiments..

Post by OnoSendai » Fri Dec 27, 2013 10:55 am

I'm gonna spend a few days on this stuff and try and get it into trunk so it can be released in a beta.

Here are a couple of tests of the new participating media code.

The sphere density model is fully procedural - it uses 'turblence', e.g. perturbing the input coordinates to a sphere equation with a FBM function.

Shader looks like this (for both scattering and absorption coeffs):

Code: Select all

def f(vec3 p) real : 
  if(dist(p, vec3(0, 1.0, 1.5)) < 0.5, 50.0, 0.0)
              
def eval(vec3 pos) vec3 :
  vec3(
    f(pos + fbm3Valued(pos * 10.0, 8) * 0.1)
  )
Attachments
sphere with turbulence and absorption.png
sphere with turbulence.png

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OnoSendai
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Re: Experiments..

Post by OnoSendai » Fri Dec 27, 2013 11:46 am

Another test.
Smaller perturbation, smaller light source.
Attachments
sphere with turbulence and absorption 2.png

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CTZn
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Re: Experiments..

Post by CTZn » Fri Dec 27, 2013 4:57 pm

New participating media code ? What is being reformed ?

One novelty I'm spotting if I'm not mistaken is that you are adding vectors out of the box, that's convenient !
obsolete asset

StompinTom
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Re: Experiments..

Post by StompinTom » Sat Dec 28, 2013 2:00 am

This is looking awesome! What kind of volume formats are you looking at supporting?

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OnoSendai
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Re: Experiments..

Post by OnoSendai » Sat Dec 28, 2013 3:30 am

StompinTom wrote:This is looking awesome! What kind of volume formats are you looking at supporting?
Hi Tom,
I haven't thought about it since the last message on the topic in this thread :)

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Re: Experiments..

Post by OnoSendai » Sat Dec 28, 2013 3:31 am

Coloured absorption :)
Attachments
coloured absorption.png

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Re: Experiments..

Post by StompinTom » Sat Dec 28, 2013 4:19 am

OnoSendai wrote:
StompinTom wrote:This is looking awesome! What kind of volume formats are you looking at supporting?
Hi Tom,
I haven't thought about it since the last message on the topic in this thread :)
Whoops, didn't notice it's the same old thread ;) it's been a while.

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Re: Experiments..

Post by OnoSendai » Sat Dec 28, 2013 5:03 am

Another test with spatially varying absorption colour:
Attachments
fbm coloured absorption.png

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Re: Experiments..

Post by Zom-B » Sat Dec 28, 2013 5:11 am

Close to it, but you need to try harder :D
rainbowwig2[1].jpg
polygonmanufaktur.de

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Re: Experiments..

Post by OnoSendai » Sat Dec 28, 2013 9:34 am

A sunrise.
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sunrise.png

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Oscar J
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Re: Experiments..

Post by Oscar J » Sat Dec 28, 2013 11:18 am

Nice. Now Borrow lyciums earth (http://www.indigorenderer.com/images/at ... simulation) and make me a wallpaper. :D

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Re: Experiments..

Post by StompinTom » Sat Dec 28, 2013 12:06 pm

OnoSendai wrote:A sunrise.
You could do some wicked mist or atmospheric effects with the FBM volume stuff. When can we have a play?

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Re: Experiments..

Post by OnoSendai » Sat Dec 28, 2013 12:13 pm

StompinTom wrote:
OnoSendai wrote:A sunrise.
You could do some wicked mist or atmospheric effects with the FBM volume stuff. When can we have a play?
Am working on it, can't say how long it will take exactly :)

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Re: Experiments..

Post by OnoSendai » Sat Dec 28, 2013 12:14 pm

Oscar J wrote:Nice. Now Borrow lyciums earth (http://www.indigorenderer.com/images/at ... simulation) and make me a wallpaper. :D
It's the same simulation - Indigo :)

What I'm going for here is efficient rendering of clouds with the atmosphere model, which is quite tricky.

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