topic Get vertex colour via python in VRED Forum

Get vertex colour via python

Totila_ — Fri, 19 Mar 2021 11:18:43 GMT

Hi there,

Is there any possibility to read/set the vertex colour of a geometry node via python?

You can get indices, positions, normals etc. but I couldnt find anything in the docs for the vertex colour.

Kind regards

Re: Get vertex colour via python

bryan_martin_morris — Wed, 31 Mar 2021 10:44:45 GMT

I'm figuring they hide somewhere in here:

I'm beginning to play with this here, by making a box and then getting the positions and then the texcoords

#get vertices colours for later nefarious work

boxy_colour = vrFieldAccess(boxy.fields().getFieldContainer("texCoords7"))

which will then require a list of vertex colours with rgb and gamma as vec4f or something along those lines. I'm just getting started so it's slow going...

check Simon Nagel's 'load point cloud script' (that I'm using for a lunch hour project that is taking more than my lunch hour 🙂 )

https://github.com/simonnagel/VRED-loadPointCloudPTS

He accesses the vertices and maps the rgb from a point cloud, so i guess this might help put you on track.

Re: Get vertex colour via python

Totila_ — Tue, 06 Apr 2021 15:28:37 GMT

Thanks for the tip. Looks good.

But it seems this only works for poly geometry, not for nurbs.. For those there is not texCoords7 in the node editor.

Re: Get vertex colour via python

michael_nikelsky — Wed, 07 Apr 2021 07:16:09 GMT

We don´t support vertex colors in our materials at the moment. The texCoord7 uses the baked indirect illumination and ambient occlusion and is therefore not used like a normal vertex color.

As for NURBS: A Shell does not have any data at all, everything is stored in the child surfaces.

Re: Get vertex colour via python

Totila_ — Wed, 07 Apr 2021 15:14:50 GMT

Thanks for your reply. @michael_nikelsky

This was helpful for me to do what I want by reading the vertex colour from the shells' children.

Thanks also to @bryan_martin_morris for the starter.