this diagram reproduce exactly the same result as VDB visualize Tree but unfortunately the Cd attribute is lost in the process, is there a way to apply the Cd attribute to each boxes from the metsadata available for each group ?

Attachments:
2022-07-25_9-36-34.png (58.1 KB)

Hi,

I had a little time today to come back to this.

So if I understand correctly my main issue is that the node PointFromVolume is loosing all the Cd attributes from my VDB primitives. So I have my colors fine when rendering the VDB node but after that everything become grey.

I tried to use the AttributeWrangle node to reapply my Cd attribute from my primitive to my points and the result is better (I can see my voxels having different colors) but not that great (clearly not the proper colors from the original VDB.

here the VEX expression I used in the Attribute Wrangle node

int prims[] = primfind(1, @P, @P);

v@Cd = set(0,0,0);
foreach ( int prim; prims )
{
vector ocd = prim(1, "Cd", prim);
v@Cd = ocd;
break;
}

and here my graph

Any idea if there is a better way of doing it ?

Attachments:
2022-08-04_15-02-23.png (30.6 KB)

Attachments:
tempimg.jpg (460.4 KB)

Attachments:
vdb_tree_viz.PNG (222.9 KB)
vdb_viz_cd_as_blocks.hip (301.3 KB)