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Re: Alembic Particle Geo and Octane.
Posted: Sun Oct 27, 2019 9:50 am
by aoktar
Octane Scatter object can read position from vertices of a polygon object or read from a *.csv file in matrix form. It's a 4x3 matrix with PSR data
or
Use standard particle object with object tag's particle rendering option.
Re: Alembic Particle Geo and Octane.
Posted: Mon Oct 28, 2019 6:31 pm
by salmon
Sorry Ahmet, It's a bit embarrassing because i feel so stupid but let's try it..
I don't find a "Standard particle object" in c4d. can be Simulate>Particle>Emitter?
I don't understand where i have to load the point cloud file (.las/.pts/.e57)
Re: Alembic Particle Geo and Octane.
Posted: Mon Oct 28, 2019 8:38 pm
by aoktar
Yes via Emitter but don't know how can you import these.
Re: Alembic Particle Geo and Octane.
Posted: Tue Oct 29, 2019 4:27 pm
by frankmci
salmon wrote:
im trying to replicate this but im missing something.. Can somebody help me with this?
"So I just made an Octane scatter object and pointed it on the alembic import. "
This means you made an alembic file from Pointcloud file using houidini?
"You'll have to import the alembic in geometry mode (not TP mode)"
Do you mean using Alembic Generator Object in c4d?
it'll be great if you can help me,
im using c4dr21
I think what he was saying is to just use the File Open or File Merge to import the .abc as geometry (Points As Polygon Object), then use the points of that geometry as the target for Octane Scatter.
That will give you a static object, though. For animation, take a look at this handy python script for importing a full sequence.
https://johnsie.de/free-python-tag-houd ... cinema-4d/
Re: Alembic Particle Geo and Octane.
Posted: Tue Oct 29, 2019 5:20 pm
by salmon
Thank you very much Frank,
that's a big help to me!!
so now i've to convert the point cloud file into abc format. (with colour)
i attached a lidar example if somebody knows how to do it:
https://getbim-my.sharepoint.com/:f:/g/ ... w?e=gBu0fF
In the meantime i'll ask in houdini forum how to do it..
Any advices will be welcome!!
Re: Alembic Particle Geo and Octane.
Posted: Wed Oct 30, 2019 10:03 am
by salmon
Just to clarify.
I don't use csv files because they lose the colour information (RGB) from the point clouds.
Re: Alembic Particle Geo and Octane.
Posted: Wed Oct 30, 2019 10:12 am
by salmon
as you see in the image, the colour is crucial.
why dont convert it to a mesh? Because the resulting mesh size.
Maybe meshes are the only option or
Maybe vdb format can help to use particles with colour?