component.flatPattern.flatBody.material.name / RuntimeError: 2 : InternalValidationError : assetInst

[gvisca44]

Struggling to find why I'm receiving this error ... other than it's a bug-but I will be happily corrected.

Code objective is to extract a bunch of information from sheet metal components so I can create purchase orders in my financial system automatically. 

I have chosen to use the material object from component.flatPattern.flatBody to avoid "challenges" where a sheet metal component has become "an assembly" and has downstream components (for example - press fit clinch studs/nuts).    

Note -

(1) - I experienced the error on component "No folds" (note the lower case 'f').  

(2) - some components use materials from my private material library and I am not sure what happens with them when the f3z archive is created.

Code as follows:

import adsk.core 
import adsk.fusion 
import traceback

def run(context):
    ui = None
    try:
        app = adsk.core.Application.get()
        ui  = app.userInterface
        
        product = app.activeProduct
        design = adsk.fusion.Design.cast(product)
        if not design:
            ui.messageBox('No active Fusion design', 'No Design')
            return

        allComps: adsk.fusion.Components = design.allComponents

        for component in allComps:
            processComponent = False
            for body in component.bRepBodies:
                if body.isSheetMetal:
                    msg = f'Component \t "{component.name}" has sheet metal body'
                    app.log(msg)
                    adsk.doEvents()

                    if not component.flatPattern:
                        msg = f'\tNo flat pattern exists'
                        app.log(msg)
                    else:
                        msg = f'\tFlat pattern name = "{component.flatPattern.name}" '
                        app.log(msg)

                        flatPatternHealth = component.flatPattern.healthState

                        # REFER ENUMS to evaluate this.
                        if flatPatternHealth == adsk.fusion.FeatureHealthStates.HealthyFeatureHealthState:
                            msg = f'\tComponent will be processed'
                            app.log(msg)

                            processComponent = True
                    """
                    bendLinesBody = component.flatPattern.bendLinesBody

                    for BRepEdge in bendLinesBody.edges:

                        (retval, isBendUp, bendAngle) = component.flatPattern.getBendInfo(BRepEdge)
                        msg = f'\tretval:{retval} isBendUp:{isBendUp} bendAngle:{bendAngle}' 
                        app.log(msg)
                        adsk.doEvents()
                    """
            if processComponent == True:

                if not component.material:
                    mat = 'No Material' 
                else: 
                    mat = component.material.name
                thickness = component.activeSheetMetalRule.thickness.value
                matCode = f'mat_{mat} t={thickness * 10:.1f}'
                msg = f'\tMaterial code(1): {matCode}'
                app.log(msg)
                adsk.doEvents()

                matObjType = component.flatPattern.flatBody.material.objectType
                msg = f'\tFlat Pattern Material object type: {matObjType}'
                app.log(msg)
                adsk.doEvents()

                mat = component.flatPattern.flatBody.material.name
                thickness = component.activeSheetMetalRule.thickness.value
                matCode = f'mat_{mat} t={thickness * 10:.1f}'
                msg = f'\tMaterial code(2): {matCode}'
                app.log(msg)
                adsk.doEvents()

    except:
        if ui:
            app.log(f'Failed:\n{ format(traceback.format_exc()) }')
            #ui.messageBox('Failed:\n{}'.format(traceback.format_exc()))

Error

Traceback (most recent call last):
  File "D:/Users/Public/G2VDesign_OneDrive/OneDrive - G2V DESIGN PTY LTD/Fusion 360 Tools/Add-ins/$GV Test Bed/$GV Test Bed.py", line 69, in run
    mat = component.flatPattern.flatBody.material.name
  File "C:\Users/gvisc/AppData/Local/Autodesk/webdeploy/production/414da7cdec4faa7986fe0d205fb521fc68f5d46c/Api/Python/packages\adsk\core.py", line 11404, in _get_name
    return _core.Material__get_name(self)
RuntimeError: 2 : InternalValidationError : assetInst

Thanks, 

Glenn.

[sanjana.shankar.goli]

@kandennti would you be able to share your insights here? Thank you!

[boopathi.sivakumar]

Hi @gvisca44 

Could not able to reproduce this error 
I got the complete result with your attached model

Since the error happens at this line I would assume this because the 

mat = component.flatPattern.flatBody.material.name

since the material property will be only valid if the flatBody is not transient so it is better to put a check if the body is not transient
https://help.autodesk.com/view/fusion360/ENU/?guid=GUID-323AC688-6E8C-45B3-8D65-421D618FE87D

[gvisca44 · Accepted solution]

Thanks for looking at this @boopathi.sivakumar.  Please go ahead and close the case.

It seems the error may have been fixed since I originally posted.

Can you explain the isTransient property ?

What would make a bRepBody - well - flat pattern body - transient ?

Glenn.