[osg-users] different materials for a geometry and highlight

Gianni Ambrosio g.ambrosio+osg at gmail.com
Thu Sep 22 03:23:18 PDT 2016

SMesserschmidt wrote:
> So basically you are raping the primitive sets to color the primitive?

Yes, that's why at the beginning I asked help to suggest me the best way to implement this. Nobody replied so I found this way.

SMesserschmidt wrote:
> That is certainly a complicated way in case you simply have a bunch of triangles which you want to re-color during selection. I'd advice to use an additional vertex-attribute (per vertex) holding your "color-index" and evaluate it in the vertex-shader and modify this based on the intersected indices. 

In fact it is a little tricky even if I'm not sure I would have a bunch of nodes to change. But who knows ...
Anyway thans for the hint. I'm trying to understand what does that means exactly but if in the menwhile you can explain me a little bit in detail it would be nice.


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