Constraining modynamics to 2d space

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Old 03 March 2013   #1
Constraining modynamics to 2d space

I want to have a group of sphere's rolling around on a plane with modynamics. But I want to constrain the sphere's on the Y axis, so they can't move up or down but can still move freely otherwise.

I figure this is a simple xpresso fix, but I can't figure it out. Anybody out there know how this could be done?
Jonah Tobias
Old 03 March 2013   #2
A collision plane on top with no friction?

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Old 03 March 2013   #3
Thanks Lennart, but that won't solve it. I should mention that the sphere's are various sizes.
Imagine if a small sphere bumped into a large one it would very easily get pushed downwards or upwards, a collision plane above and below the sphere's would constrain them, but it wouldn't prevent overlaps.
Jonah Tobias
Old 03 March 2013   #4
If they're all spheres, you might be able to use cylinders instead (Non-renderable. just need them for their location). Have them with the same height, but different radii.

Then read the cylinder positions and use those as the centers for spheres with the same radius... Or you could just have said spheres renderable, and set as children to the cylinders.
Do what you want to do, not what you think you want to do.
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Old 03 March 2013   #5
rustEdge, that's probably the way to go. It's a shame I can't do it with sphere's all the way because they are calculated much faster in dynamics than cylinders. But your method works well.
Jonah Tobias
Old 03 March 2013   #6
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