topic Re: Extracting Ball Joint Euler Angles in Fusion API and Scripts Forum

Extracting Ball Joint Euler Angles

Anonymous — Fri, 21 Aug 2020 16:58:57 GMT

1) Are ball joint Euler angles accessible as parameters? Can't find parameter names.

2) Should angles be accessible with something like this? What attribute extracts the value of the property: yaw ?

# Extract yaw, pitch and roll angles for a ball joint named 'Ball Joint' ballJoint = root.joints.itemByName('Ball Joint') yaw = adsk.fusion.BallJointMotion.yawValue pitch = adsk.fusion.BallJointMotion.pitchValue roll = adsk.fusion.BallJointMotion.rollValue yawMsg = 'Yaw = {:.3f}°'.format(math.degrees(yaw.???)) pitchMsg = 'Pitch = {:.3f}°'.format(math.degrees(pitch.???)) rollMsg = 'Roll = {:.3f}°'.format(math.degrees(roll.???))

Thanks

Re: Extracting Ball Joint Euler Angles

Anonymous — Sat, 22 Aug 2020 18:27:06 GMT

1) Still haven't found the Euler angle parameter names, but

2)This extracts the angles (note a little renaming from first example):

rodEnd = root.joints.itemByName('Ball Joint') rodEndMotion = adsk.fusion.BallJointMotion.cast(rodEnd.jointMotion) yaw = rodEndMotion.yawValue pitch = rodEndMotion.pitchValue roll = rodEndMotion.rollValue msg = 'Yaw = {:.3f}°\nPitch = {:.3f}°\nRoll = {:.3f}°'.format(math.degrees(yaw), math.degrees(pitch), math.degrees(roll))

Re: Extracting Ball Joint Euler Angles

BrianEkins — Mon, 24 Aug 2020 04:10:31 GMT

Those angles don't exist as parameters. You can see below the parameters that are created for a ball joint.

The yaw, pitch, and roll are internal values local to the ball joint and are only accessible via the Drive Joint command and through the API using the properties BallJointMotion object that you already found. Those properties are read-write so you can use the API to change them, which is the equivalent of the Drive Joint command.