Gravity NOT working

[Gray Marshall]

This is silly, but I can't figure it out...

When I do this (and much more) in the GUI, it works fine.. the ball falls when I hit "Play".

When I try to do the same thing with the code below, it doesn't work.  It looks exactly the same in the Outliner & in the Attribute Editor, but no gravity.  Thoughts?

import maya.cmds as mc

mc.polySphere()
mc.rigidBody()
mc.select(clear=1)
mc.gravity()

[Marcus Ottosson]

I put together a Bullet example for you, and then realised you were using the system prior to Bullet being introduced to Maya, so I’ll post both examples for future readers.

So I think you’re doing it right, at least it appears to be designed for use in this way. If so, it isn’t doing what it’s supposed to.

import maya.cmds as mc

mc.polySphere()
mc.rigidBody()

# mc.select(clear=1)
mc.gravity()

Firstly, I expect you’ll need to actually have your object selected, as forces are applied per-rigid. The problem however is that when applying gravity via Python, it generates this extra geoConnector node for some reason. :/

You can “repair” this manually, and end up with what you get when using the Maya Fields menu, by connecting the missing bits like this.

import maya.cmds as mc

mc.polySphere()
rigid = mc.rigidBody()
_, gravity = mc.gravity()
cmds.connectAttr(gravity + ".outputForce[0]", rigid + ".inputForce[0]")
cmds.connectAttr(rigid + ".fieldData", gravity + ".inputData[0]", force=True)

And finally, here’s the Bullet equivalent, plus a ground plane.

from maya import cmds as mc
from maya.app.mayabullet import RigidBody

cmds.file(new=True, force=True)
mc.polySphere()
cmds.move(0, 5)
_, rigid = RigidBody.CreateRigidBody(True).executeCommandCB()
cmds.setAttr("bulletSolver1.groundPlane", True)
cmds.setAttr(rigid + ".colliderShapeType", 2)  # Sphere

These were tested on Maya 2020.

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