To clarify, e3 because when the angles are 0,0,0, your looking orthogonally at the x,y plane.

@acer 

"And it sounds as if you want it to update repeatedly, in any single set of mouse movements over the plot. Is that right?"

That's exactly what I want to do.

I think I may have figured out a way to do it. When/if I get it, I'll post my worksheet.

Thanks

"Are you looking for something else?"

Yes, I want to be able to use these values in my calculations as I rotate.

Thanks

"Are you looking for something else?"

Yes, I want to be able to use these values in my calculations as I rotate.

Thanks