particles to alembic - attributes?

[jbvfx]

Hi,

When you export particles to an alembic file and then load it as a vray proxy, is it possible to get attributes like rgbPP, velocity, radiusPP etc to pass through to the alembic file and then use them with the particleSampler shadingnode?

Also the particle size/radius doesn't seem to transfer.

--
Jacob

[vlado]

Which version are you using? It's probably not in the initial beta, for the nightly builds you can actually read those attributes by name using a VRayVertexColors texture.

Best regards,
Vlado

[jbvfx]

I'm using nightly 24415

[jbvfx]

So how would I go about doing that? I guess I need to connect the vraymesh to the VertexColors? and then specify the set to use?

How do I specify what attributes are exported to the alembic file? Is that in the export alembic optionbox?

[asen.atanasov]

No, there are no such options in the default maya alembic exporter. Widths (radii) are not exported. Particle color export is also not supported (or I don't know how). You might ask Autodesk. Houdini has very flexible way to export whatever channels you wish.

The easiest way to render colors through VRay proxy is to use the particleSampler. It will render the first color channel found. If this renders black, this is a clear indicator that no color channel exists. If you have more than one you can use VRay Vertex Colors texture and specify the color channel by name or by index.
If widths (radii) are not present in the file we set all the radii to 1. This usually produces huge particles, so you may need to adjust their size using "Particle width multiplier" parameter.

Best regards,
Asen