CylindricalJointMotion returns wrong limits value

[MichaelT_123]

Hi T_F360,

During some venturous exercise I have stumbled across some strange behaviour of  CylindricalJointMotion API.  It took me quite a wwwwhile to trace it to the joint limits returning method.

Here is the sample design test file:

 #------------------------------------------------------------------------------------------------------------------------------------------

#Author-MichaelT

#Description-CylinderJointTest

import adsk.core, adsk.fusion, adsk.cam, traceback

def run(context):

ui = None

try:

app = adsk.core.Application.get()

ui = app.userInterface

product = app.activeProduct

design = adsk.fusion.Design.cast(product)

rootComp = design.rootComponent

builtInJoints = rootComp.asBuiltJoints

cylindricalJoint = builtInJoints.itemByName( 'CylindricalJoint' )

#Deep check !!!

if ( cylindricalJoint.name == 'CylindricalJoint' 😞

cylindricalMotion = cylindricalJoint.jointMotion

rotation_Limits = cylindricalMotion.rotationLimits

slide_Limits = cylindricalMotion.slideLimits

if ( rotation_Limits.isMaximumValueEnabled 😞

limRotMax = rotation_Limits.maximumValue

if ( rotation_Limits.isMinimumValueEnabled 😞

limRotMin = rotation_Limits.minimumValue

if ( rotation_Limits.isRestValueEnabled 😞

restRot = rotation_Limits.restValue

if ( slide_Limits.isMaximumValueEnabled 😞

limSlideMax = slide_Limits.maximumValue

if ( slide_Limits.isMinimumValueEnabled 😞

limSlideMin = slide_Limits.minimumValue

if ( slide_Limits.isRestValueEnabled 😞

restSlide = slide_Limits.restValue

if (limRotMax == None or

limRotMin == None or

restRot == None or

limSlideMax == None or

limSlideMin == None or

restSlide == None 😞

ui.messageBox('Can not find the CylindricalJoint ')

else:

messageStr = 'CylindricalJoint limit values:\n'

messageStr += '\tlimRotMax = {:g} rad \n'.format( limRotMax)

messageStr += '\tlimRotMin = {:g} rad \n'.format( limRotMin)

messageStr += '\trestRot = {:g} rad\n\n'.format( restRot )

messageStr += '\tlimSlideMax = {:g} cm\n'.format( limSlideMax )

messageStr += '\tlimSlideMin = {:g} cm\n'.format( limSlideMin )

messageStr += '\trestSlide = {:g} cm\n'.format( restSlide )

ui.messageBox( messageStr )

else:

ui.messageBox('Can not find the CylindricalJoint ')

except:

if ui:

ui.messageBox('Failed:\n{}'.format(traceback.format_exc()))

 #------------------------------------------------------------------------------------------------------------------------------------------

One would expect  (based on user interface input values) that the rotation limits returned < -p, +p > … Instead we got values, which correspond to the slider’s limit values ???

I am attaching the .py & .f3d files  … to commemorate my misfortune … or mine inability to understand the FAPI correctly.

… and also screencast …

Regards

MichaelT

PS. The system does not allow me to attach *.py file so it is pasted instead.

[marshaltu]

Hello,

Thank you for reporting the issue to us. I logged it as UP-37251 in our internal bug system.

Thanks,

Marshal