Trouble setting vertex colour

[Pete]

Hi there,

I thought I'd have a go at making an ICE compound that would grab the vertex colours from a nearby mesh and apply those colours to the verts on another mesh.
I thought I'd just start by setting the colour of verts if they are close to the other mesh, but I can't seem to get it to set data on the vertex colour
Not sure what I'm doing wrong here can anyone see what the problem might be?

Thanks
Pete

[dwigfor]

Search on Vimeo for Pooby's RayCam video. I forget the exact one, but it's one of if not his last one. He demonstrates how to set Vertex Colors on a grid through raycasting.

The important node was Node to Location (I think, or maybe that's an attribute). Great tutorial and I always end up searching for it for doing Vertex Colors stuff..

-Dave

[Pete]

Okay I got it half working, thanks to those vid's, they are pretty cool!





One thing I can't figure out still is that for some reason I can't blend back to the original vertex colours,
for some reason it won't let me plug that in.... does anyone know why?
It seams that i can plug either in but not at once.


(yeah my screen capture wasn't happy with me plugging stuff)

Thanks
Pete

[Pete]

okay I figured it out!


I had to set the new blend colours then blend that with the original colours.
Yeay.

[Pete]

Ahhhh F***K! I spoke too soon. if i do it this way it means i can't use the distance to blend as they are per point not per sample like the colour.



anyone know how to make this plug in?

[Mathaeus]

Ahhhh F***K! I spoke too soon. if i do it this way it means i can't use the distance to blend as they are per point not per sample like the colour.
anyone know how to make this plug in?

as you said, it's about context, vertex colors are in "node" context, there's one on each corner of polygon.That is, 'under' one vertex, there's a chance for many vertex colors. This allows vertex colors to have a sharp mix on each side of some edge, if you want this.

'Get distance to surface" probably have a self.pointposition plugged into 'get closest location' or like, so it's per-point context, all the time. You could try a plain 'get closest location' with 'self.NodePosition' as input. This ensures the same context.

ICE tree

Or... if same color on all vertex colors that belongs to vertex, is enough: create a custom attribute in per point context, let's say, 3d vector. Convert vertex color inputs to this attribute, do all operations, set it back to vertex colors at the end of ICE tree.

[Pete]

Thanks Mathaeus,
That works great! I get a bit frustrated with ICE when stuff like this trips me up, at least there's a good community here when it does

[Mr.Core]

You can also use a build array from set to build an array from per-vertex data, and then use self.nodeToVertex attribute to select relative vertex from builded array and set it at the actual node

[Pete]

Hey I thought I had my head around it but I just tried to plug a turbulize node in between the getDistance and the blend colour and it had the same context issues. Is it weird that it would have it there, I thought it would have kept the same context?