Particles and Scatter node

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Carrara (Integrated Plugin developed by Sighman)

Particles and Scatter node

Postby tschwenke » Sat Nov 12, 2016 10:56 pm

tschwenke Sat Nov 12, 2016 10:56 pm
Hi Sighman,

The Carrara particle emitter is fine but it seems to have a limit of 1000000 particles. I understand that Octane can use a CSV scatter file to import huge amounts of particle positions. Is there any chance that you can implement this feature into Carrara? Or do you have another idea how to get particles into Carrara and render it in Octane?

Best wishes,
Thomas
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Re: Particles and Scatter node

Postby Sighman » Sun Nov 13, 2016 4:22 pm

Sighman Sun Nov 13, 2016 4:22 pm
tschwenke wrote:The Carrara particle emitter is fine but it seems to have a limit of 1000000 particles. I understand that Octane can use a CSV scatter file to import huge amounts of particle positions. Is there any chance that you can implement this feature into Carrara? Or do you have another idea how to get particles into Carrara and render it in Octane?

A particle has more than just a position. It has a size, although this may be constant, and a UV coordinate, for material/color. A particle can also have a velocity vector to give it blur. What format do you suggest for the csv file? Do you have a particle simulator to generate this file? You would need to generate multiple files in order to animate the particles.
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Re: Particles and Scatter node

Postby tschwenke » Sun Nov 13, 2016 5:13 pm

tschwenke Sun Nov 13, 2016 5:13 pm
Hi,

Thx for your answer.

The file format is specified here: https://docs.otoy.com/#60The%20Scatter%20Node

I think this would do the trick. I'd write (or have it written!) a script or program that will convert PTR (=Krakatoa), BIN (Realflow) or any other file containing particles to one or several CSV files (when it comes to animations) in the format specified above. There is no need to see the particles in the Carrara view port, as the Octane IPR should be enough. All particles should then be represented by only one object as it is described in the manual when it comes to the Octane Scatter node.

Other information like temperature, speed, density, color, etc. need not to be implemented in the first place. Of course, if you want to make a statement, I won't say "no" to a plugin that supports "real" particle files such as PRT, ABC or BIN. There is quite some documentation on Alembic (https://github.com/alembic/alembic) and Krakatoa PRT (https://github.com/ThinkboxSoftware/PRT-IO-Library).

I'd also invest some money if you do contractual work and if you think that it's too much work.

Best wishes,
Thomas
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Re: Particles and Scatter node

Postby tschwenke » Sun Nov 20, 2016 11:30 am

tschwenke Sun Nov 20, 2016 11:30 am
Hi,

Any feedback on this one would be appreciated :)

Best wishes,
Thomas
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Re: Particles and Scatter node

Postby protovu » Sun Nov 20, 2016 5:46 pm

protovu Sun Nov 20, 2016 5:46 pm
Hi Thomas,

Thank you for pursuing this. It is important.
Was the issue on Blender vdb to Carrara ( viewtopic.php?f=79&t=57005&p=292736&hilit=vdb#p292736 ) adanced?
This was to simulate smoke and/or fluid, correct?

Rick
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Re: Particles and Scatter node

Postby tschwenke » Sun Nov 20, 2016 10:09 pm

tschwenke Sun Nov 20, 2016 10:09 pm
Hi Rick,

As far as I know, Sighman hasn't yet modified the plugin to correct the error.

Best wishes,
Thomas
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Re: Particles and Scatter node

Postby Sighman » Mon Nov 21, 2016 5:57 am

Sighman Mon Nov 21, 2016 5:57 am
tschwenke wrote:Hi,

Any feedback on this one would be appreciated :)

Best wishes,
Thomas

Still thinking about how to approach this one.
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Re: Particles and Scatter node

Postby tschwenke » Mon Nov 21, 2016 10:14 pm

tschwenke Mon Nov 21, 2016 10:14 pm
Hi once again :)

Then, hopefully, you will find out how to do it soon :)

I'd be grateful forever if I could render Particles in Carrara natively :)

Best wishes,
Thomas
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Re: Particles and Scatter node

Postby tschwenke » Tue Nov 29, 2016 7:59 pm

tschwenke Tue Nov 29, 2016 7:59 pm
Hi Sighman,

Any news on this?

I just had the idea to use the particle system within Carrara that you are already using in Octane for Carrara. Perhaps, this would be the best possible solution :)

Just a question: Can you read any information (e.g. age) of a given particle?

Best wishes,
Thomas
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Re: Particles and Scatter node

Postby Sighman » Wed Nov 30, 2016 12:58 am

Sighman Wed Nov 30, 2016 12:58 am
No and that is why I don't support any particle type other than object. Carrara just does not expose any particle info that I can use. I'm just lucky that object particles appear as replicated instances.
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