Mitsuba Exporter

Discussions concerning plugins for SOFTIMAGE©
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TwinSnakes007
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Re: Mitsuba Exporter

Post by TwinSnakes007 » 07 Feb 2013, 18:58

For instance, you could render this in Mitsuba.


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Tekano
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Re: Mitsuba Exporter

Post by Tekano » 07 Feb 2013, 19:01

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!

:D
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TwinSnakes007
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Re: Mitsuba Exporter

Post by TwinSnakes007 » 07 Feb 2013, 19:13

Tekano wrote:but was thinking about the grid format itself
Its a very simple binary format. You describe a header, and then write the data.

Here's a C# implementation of the GridVolume format.

GridVolume.cs

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Tekano
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Re: Mitsuba Exporter

Post by Tekano » 03 Apr 2013, 11:37

any news on this twinsnakes? looking forward to trying this out for sure
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TwinSnakes007
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Re: Mitsuba Exporter

Post by TwinSnakes007 » 03 Apr 2013, 15:59

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.

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Tekano
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Re: Mitsuba Exporter

Post by Tekano » 03 Apr 2013, 16:33

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!
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Mathaeus
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Re: Mitsuba Exporter

Post by Mathaeus » 03 Apr 2013, 16:59

...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 :)

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TwinSnakes007
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Re: Mitsuba Exporter

Post by TwinSnakes007 » 03 Apr 2013, 19:16

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 :)
I'm not sure I understand what the bug is? Is it that the reading of ICE attributes is not consistent?

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Tekano
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Re: Mitsuba Exporter

Post by Tekano » 03 Apr 2013, 20:00

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! :-bd
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Mathaeus
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Re: Mitsuba Exporter

Post by Mathaeus » 03 Apr 2013, 21:07

TwinSnakes007 wrote:
I'm not sure I understand what the bug is? Is it that the reading of ICE attributes is not consistent?
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.

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TwinSnakes007
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Re: Mitsuba Exporter

Post by TwinSnakes007 » 03 Apr 2013, 21:32

Mathaeus wrote:
TwinSnakes007 wrote:
I'm not sure I understand what the bug is? Is it that the reading of ICE attributes is not consistent?
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.
Oh yeah, I'm very familiar with NaN's, especially in reading ICE Strand data. So I do error checking when I'm reading ICE Attributes and use a default value when I encounter a NaN.

AFAIK, NaN's come from particle attributes on particles that are Born but are not evaluated yet. Basically, the data array has been created as a place holder for evaluation.

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TwinSnakes007
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Re: Mitsuba Exporter

Post by TwinSnakes007 » 07 Apr 2013, 04:09

Looks like its working in my first test. Exported 602 Particles and wrote 6,000 lines of XML in 1.14 seconds.

SI Scene
SI 2013 SP1 Scene
SI 2013 SP1 Scene
Mitsuba Render
Mitsuba 4.4.0 Render
Mitsuba 4.4.0 Render

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TwinSnakes007
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Re: Mitsuba Exporter

Post by TwinSnakes007 » 14 May 2013, 23:43

Finally got multi-material working. :ymhug:
MultiMaterial
MultiMaterial
Next up is UV's and VertexColors.

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TwinSnakes007
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Re: Mitsuba Exporter

Post by TwinSnakes007 » 18 May 2013, 21:07

Vertex Colors
RT_VertexColors.jpg

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TwinSnakes007
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Re: Mitsuba Exporter

Post by TwinSnakes007 » 18 May 2013, 21:12

Since both Vertex Colors and Texture Coordinates are in the Sample space, I got UV's for free! :D
RT_TextureCoordinates.jpg

neuk
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Re: Mitsuba Exporter

Post by neuk » 26 Jul 2013, 14:07

Hey great work... Mitsuba looks amazing, and your work on the exporter is great.

I had one question, how does mitsuba handle output? Im guessing aov's are not implemented yet but is there any settings for handling what file format to output and similar?

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