A potential use-case for template mixins?

[Matt]

I am (still) writing a 3D graphics engine, and was considering my 
choices for a scene graph.

Originally, I was going to use classes derived from my base 
SceneNode class for the nodes of the graph, but would this 
instead be a better situation to use template mixins instead of 
potentially having to include a lot of information in the base 
class? Or should I go with the traditional "everything is derived 
from the base class"?

I understand if this is light on details, I'll try and provide 
more if necessary, but I'm really not far into the design beyond 
this, and was wondering which would make for an easier path in 
the future