Mitsuba Exporter
- TwinSnakes007
- Posts: 316
- Joined: 06 Jun 2011, 16:00
Re: Mitsuba Exporter
No pictures this time, but added support for:
Homogeneous and Heterogeneous Volumes
Cameras and Camera Shaders
Lights and Light Shaders
Homogeneous and Heterogeneous Volumes
Cameras and Camera Shaders
Lights and Light Shaders
- TwinSnakes007
- Posts: 316
- Joined: 06 Jun 2011, 16:00
Re: Mitsuba Exporter
Sure do. Waiting for Bug repository to be setup and then we'll put this puppy thru the paces.
-TS-
P.S. - Working on GridVolume at the moment. This will allow you to define Volume shapes using SI PointClouds & ICE.
GridVolume is how this was done:
[rimg=800]http://www.mitsuba-renderer.org/images/gallery/scarf-flakes.png[/rimg]
-TS-
P.S. - Working on GridVolume at the moment. This will allow you to define Volume shapes using SI PointClouds & ICE.
GridVolume is how this was done:
[rimg=800]http://www.mitsuba-renderer.org/images/gallery/scarf-flakes.png[/rimg]
Last edited by TwinSnakes007 on 07 Feb 2013, 18:09, edited 1 time in total.
- TwinSnakes007
- Posts: 316
- Joined: 06 Jun 2011, 16:00
Re: Mitsuba Exporter
Adding PointCloud generation of GridVolumes has been tough. The difficult part about adding this feature was not breaking the existing support for ConstVolume as well.
I had to rework the Heterogeneous shader definition to support both ways, and I think I'm good to go now. I thought this would take a day to do, its been like over a week.
I hope to post a video tonight of setup and result.
I had to rework the Heterogeneous shader definition to support both ways, and I think I'm good to go now. I thought this would take a day to do, its been like over a week.
I hope to post a video tonight of setup and result.
Re: Mitsuba Exporter
sounds awesome, and incredibly complicated! looking forward to seeing your video.
how are gridvolumes being supported via Softimage? what format are they in to start with?
how are gridvolumes being supported via Softimage? what format are they in to start with?
Gossip is what no one claims to like, but everybody enjoys.
- TwinSnakes007
- Posts: 316
- Joined: 06 Jun 2011, 16:00
Re: Mitsuba Exporter
A GridVolume is a Volume composed of "cells" along each axis x,y,z. Each cell can have 3 properties: Density, Color, Orientation. So this data can easily be defined via PointClouds in Softimage. The hard part was coming up with a way to do that, so that its reasonably intuitive to an SI user.Tekano wrote:how are gridvolumes being supported via Softimage? what format are they in to start with?
So, after several different approaches, the cleanest way I could come up with is a combination of:
* Use the particle "color" attribute to set the cell Color property, the particle "mass" attribute to set the cell Density property, and the particle "force" attribute to set the cell Orientation property.
* Require a "Generate 3D Point Grid" node to be present on a ICE Tree. I read the values of this compound to set the x,y,z resolution of the GridVolume and to error check against the NbPoints attribute.
So, with that setup, you can do anything you want to the PointCloud, except one thing - Delete a point. The number of particles described by the ""Generate 3D Point Grid" node must equal the number of points in the PointCloud. Other than that limitation, you can set the values of those 3 properties by any means available to you in SI.
- TwinSnakes007
- Posts: 316
- Joined: 06 Jun 2011, 16:00
Re: Mitsuba Exporter
For instance, you could render this in Mitsuba.
Re: Mitsuba Exporter
oh interesting, ok thats how I imagined it being implemented with ICE only, but was thinking about the grid format itself on how to bring the grid volume data from another format like .Bafl or field3d or http://www.openvdb.org/ or maya fluids or houdini bgeo etc.
so for example if we managed to get the grid data into softimage from other formats and changed each cell to be a particle and reassign the density - mass etc we should be able to render it in Mitsuba!
so for example if we managed to get the grid data into softimage from other formats and changed each cell to be a particle and reassign the density - mass etc we should be able to render it in Mitsuba!
Gossip is what no one claims to like, but everybody enjoys.
- TwinSnakes007
- Posts: 316
- Joined: 06 Jun 2011, 16:00
Re: Mitsuba Exporter
Its a very simple binary format. You describe a header, and then write the data.Tekano wrote:but was thinking about the grid format itself
Here's a C# implementation of the GridVolume format.
GridVolume.cs
Re: Mitsuba Exporter
any news on this twinsnakes? looking forward to trying this out for sure
Gossip is what no one claims to like, but everybody enjoys.
- TwinSnakes007
- Posts: 316
- Joined: 06 Jun 2011, 16:00
Re: Mitsuba Exporter
I'm still pluggin away at it. I had no idea ICE RenderTree attributes would be this tough to incorporate into the code base. They have been a pain. Basically, everything can have an ICE tree!
I've got some code working that detects an ICE Attribute and validates that it has ICE data (attribute not set to "Use Default Value"), so I'm pretty close.
I've got some code working that detects an ICE Attribute and validates that it has ICE data (attribute not set to "Use Default Value"), so I'm pretty close.
Re: Mitsuba Exporter
if you are having problems implementing ICE attributes in your code you should definately post questions, maybe someone has been there before and can help you!
Gossip is what no one claims to like, but everybody enjoys.
Re: Mitsuba Exporter
...or you can look at this from another side. At least from what I heard, this issue seems to appear again in SI 2013, global score of working-not working seems to be fifty-fifty, for out of the box renderer. So, few attributes more or less, who cares
- TwinSnakes007
- Posts: 316
- Joined: 06 Jun 2011, 16:00
Re: Mitsuba Exporter
I'm not sure I understand what the bug is? Is it that the reading of ICE attributes is not consistent?Mathaeus wrote:...or you can look at this from another side. At least from what I heard, this issue seems to appear again in SI 2013, global score of working-not working seems to be fifty-fifty, for out of the box renderer. So, few attributes more or less, who cares
Re: Mitsuba Exporter
ha well in Matheus's case the bug (between scanline and rasterizer not having same values for attributes) is mute... because we will be rendering attributes with Mitsuba!
Gossip is what no one claims to like, but everybody enjoys.
Re: Mitsuba Exporter
Yeah, sometimes happens, that renderer reads ICE tree 'partially' - what you see in viewport, doesn't appear into renderer. It could be worse than just wrong reading of color attribute. Sometimes, reason is NaN in ICE (still solved by ICE, don't know how). sometimes, it's not. Form my knowledge, it's not only with Mental Ray, but integration with MR seems to be champion in errors.TwinSnakes007 wrote:
I'm not sure I understand what the bug is? Is it that the reading of ICE attributes is not consistent?
Who is online
Users browsing this forum: No registered users and 15 guests