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Rendering with Arnold in CINEMA 4D using the C4DtoA plug-in.
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Transfer a color attribute from houdini to c4d

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Message 1 of 5
marcovalmori6
2123 Views, 4 Replies

Transfer a color attribute from houdini to c4d

Hi,

I've imported a particles simulation from houdini to c4d with 3 attributes: Cd, P and pscale; after that i set up an xpresso rig to read those attributes, and put an arnold tag and a standard shader to my alembic.

As far as the pscale everything works fine, but when i try to connect a user_data_rgb with "Cd" as my attribute, the color shown is the default one, it seems it cannot read that input.

The thing is, i can clearly see the different particles color in the viewport and in my thinking particles channel, i see the Cd(vector) listed.

Can anyone help me out? Thanks

6986-annotazione-2020-05-18-203751.png

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Message 2 of 5

I assume you are using the Arnold TP Group object to render Thinking Particles. It has a field, called Export channels, where you have to define which channels you want to export to Arnold. Did you define Cd there?

Message 3 of 5

@Peter Horvath I was using an arnold tag on my alembic, but using a TP group solves the problem, thanks!

I do have another problem however, in the ipr the scale of the particles is correct, but when i render they all have the same size. I tried to add a pscale attribute in the tp group and put a user_data_float node in my shader network, but i'm not really sure where to connect it.

Message 4 of 5

It's strange that it does not work in the render. Maybe it's an issue when the xpresso network is evaluated. Xpresso tag has a Priority option, you can try to change it if it helps. If it does not, can you send me your scene to take a look?

Message 5 of 5

Changing the priority option to animation and then back to initial, solved the problem, thanks!

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