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[Jan Stránský <question701415@xxxxxxxxxxxxxxxxxxxxx>]

Question #701415 on Yade changed:
https://answers.launchpad.net/yade/+question/701415

Jan Stránský proposed the following answer:
> It doesn't work.

you have to use is correctly, i.e. actually using the material with non-
zero density

> box.mat=O.materials[Mat]

this has no effect on already set values, e.g. box.state.mass

> O.load('initial.yade.bz2')

previously appended
Mat = O.materials.append(FrictMat(...))
is overwritten with loaded materials, i.e.
SphereMat = O.materials.append(FrictMat(..., density = Density))
WallMat = O.materials.append(FrictMat(..., density = WDensity)) # 0 !!

> box = utils.box(...)

if material is not explicitly specified, lastly appended material is used.
In this case, WallMat with zero density
Therefore the boxes have zero mass and you get the error.

Solution: e.g. append Mat after O.load (such that it is the lastly
appended material)

Cheers
Jan

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