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Re: [Question #682414]: how to get vertex coordinate of polyhedra created by function polyhedra_utils.fillBox()

To: yade-users@xxxxxxxxxxxxxxxxxxx
From: Jan Stránský <question682414@xxxxxxxxxxxxxxxxxxxxx>
Date: Tue, 30 Jul 2019 12:03:02 -0000
Reply-to: question682414@xxxxxxxxxxxxxxxxxxxxx
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Question #682414 on Yade changed:
https://answers.launchpad.net/yade/+question/682414

Jan Stránský posted a new comment:
Hello,
sorry for late answer..

> what does the argument shape mean

b.shape

> get the volume of a polyhedra

b.shape.GetVolume() [1]

> can i achive that according to its id?

b = O.bodies[id]

> how to obtain the vertex coordinates of any polyhedron.

transform the polyedron's local coordinates to globals using b.state.pos and b.state.ori:
###
vsLocal = b.shape.v # [2], vertices in Polyhedron's coordinate system
vsGlobal = [b.state.pos + b.state.ori*v for v in vsLocal] # vertices in global coordinate system
###

cheers
Jan

[1] https://yade-dem.org/doc/yade.wrapper.html#yade.wrapper.Polyhedra.GetVolume
[2] https://yade-dem.org/doc/yade.wrapper.html#yade.wrapper.Polyhedra.v

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