Body physical property with VeryHighCalculationAccuracy

yamamoto.mas — Sun, 14 Jun 2020 13:24:03 GMT

I'm trying to get moment of inertia of bodies as precisely as possible.

But the following getPhysicalProperties makes AttributeError:

Is there any other way to get precise physical properties of body ?

I'm using the following code which gives me properties with low precision.

import adsk.core, adsk.fusion, traceback def spacePadRight(value, length): pad = '' if type(value) is str: paddingLength = length - len(value) + 1 else: paddingLength = length - value + 1 while paddingLength > 0: pad += ' ' paddingLength -= 1 return str(value) + pad def walkThrough(bom): mStr = '' for item in bom: mStr += spacePadRight(item['name'], 15) + spacePadRight(item['i1'], 10) + spacePadRight(item['i2'], 10) + str(item['i3']) + '\n' mStr += spacePadRight(item['name'], 15) + spacePadRight(item['rx'], 10) + spacePadRight(item['ry'], 10) + str(item['rz']) + '\n' return mStr def run(context): ui = None try: app = adsk.core.Application.get() ui = app.userInterface product = app.activeProduct design = adsk.fusion.Design.cast(product) title = 'Extract Primitive' if not design: ui.messageBox('No active design', title) return # Get all occurrences in the root component of the active design root = design.rootComponent occs = root.allOccurrences # Gather information about each unique component bom = [] occ = occs[0] comp = occ.component bodies = comp.bRepBodies for bodyK in bodies: if bodyK.isSolid: physicalProperties = bodyK.physicalProperties # physicalProperties = bodyK.getPhysicalProperties(adsk.fusion.CalculationAccuracy.VeryHighCalculationAccuracy) (retVal, i1, i2, i3) = physicalProperties.getPrincipalMomentsOfInertia() (retVal, rx, ry, rz) = physicalProperties.getRotationToPrincipal() # Add this component to the BOM bom.append({ 'name': bodyK.name, 'i1': round(i1,3), 'i2': round(i2,3), 'i3': round(i3,3), 'rx': round(rx,3), 'ry': round(ry,3), 'rz': round(rz,3), }) msg = walkThrough(bom) ui.messageBox(msg, 'Bill Of Materials') except: if ui: ui.messageBox('Failed:\n{}'.format(traceback.format_exc()))

Re: Body physical property with VeryHighCalculationAccuracy

OceanHydroAU — Fri, 03 Jul 2020 05:34:39 GMT

Perhaps do not use round()?

AttribueError sounds like a bug you can fix though?

Re: Body physical property with VeryHighCalculationAccuracy

yamamoto.mas — Fri, 03 Jul 2020 08:52:50 GMT

> Perhaps do not use round()?

Thanks for a comment.

This program is just for displaying data on the UI dialog.

In reality, another function calculates the body's shape and orientation with the assumption that the body is a cuboid. If I can get higher precision physical properties, I can get better estimation...

Re: Body physical property with VeryHighCalculationAccuracy

BrianEkins — Sat, 04 Jul 2020 00:41:17 GMT

Unfortunately, there appears to be an oversight in the design of the API. The BRepBody object only supports the physicalProperties property and this doesn't let you define the accuracy. It should also support the getPhysicalProperties method like some other objects do. I've reported this to Autodesk and hopefully it's addressed soon.

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Body physical property with VeryHighCalculationAccuracy

Re: Body physical property with VeryHighCalculationAccuracy

Re: Body physical property with VeryHighCalculationAccuracy

Re: Body physical property with VeryHighCalculationAccuracy