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[Eugen Kubowsky <question226804@xxxxxxxxxxxxxxxxxxxxx>]

New question #226804 on Yade:
https://answers.launchpad.net/yade/+question/226804

Hi guys,
I'm playing around with forces in Yade.
Suppose that there are two facets (Bodies 18 and 19) that make up a rectangular. I use ForceEngines to apply given force on these facets. The force vector for facet 18 shows in x-direction, force vector for facet 19 shows in y-direction - have a look at the ForceEngines:
	ForceEngine(ids=[18],force=(10,0,0)),
	ForceEngine(ids=[19],force=(0,10,0))
You see normal vectors of these two facets here:

Yade []: O.bodies[18].shape.normal
 ->  []: Vector3(0.92387953251128696,0.38268343236508945,0)
Yade []: O.bodies[19].shape.normal
 ->  []: Vector3(0.92387953251128696,0.38268343236508945,-0)

The problem is, that I don't understand, why calling forces.norm() gives 10 for both facets. In my eyes the projected force on the normal vector of facet 18 ( I suppose that this is done by O.forces.f(18).norm()) should be higher than the value for facet 19.
here are the code fragments:
	
Yade []: O.forces.f(18)
 ->  []: Vector3(10,0,0)
Yade []: O.forces.f(18).norm()
 ->  []: 10.0
   
Yade []: O.forces.f(19)
 ->  []: Vector3(0,10,0)
Yade []: O.forces.f(19).norm()
 ->  []: 10.0

On the other side if I apply a force that in x and y direction using e.g. ForceEngine(ids=[19],force=(15,10,0)) I'll get:
Yade []: O.forces.f(19)
 ->  []: Vector3(15,10,0)
Yade []: O.forces.f(19).norm()
 ->  []: 18.027756377319946
 which is quite the result I expected.

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