[osg-users] Node with different projection/view matrix fixed pipeline

[Robert Osfield]

The way I'd tackle dragging of objects in model space that are billboarded 
icons would be to project the mouse coords into clip coords then into 
object space using the matrices inverse of the (projection * view * 
model).  You'd also need to compute the depth to use, this could be 
computed by taking the original object space into clip coords, then using 
this in the mouse clip coords to object space multiplication.

Hopefully this makes sense.  It's a bit of advance topic as it requires 
understanding how matrices are used in the scenegraph/3D graphics.

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