Copy and Move feature in loop

[rocco.mayr]

In try to copy a body 6 times and move it to different positions in a loop. I tried different things but can't get it work.

Here is the code and the error:

app = adsk.core.Application.get()
        ui  = app.userInterface
        design = adsk.fusion.Design.cast(app.activeProduct)

        # Get the root component of the active design.
        rootComp = design.rootComponent

        # Get the first sub component
        occs = rootComp.occurrences
        subComp1 = occs.item(0).component
        
        # Get the first body in sub component 1
        baseBody = subComp1.bRepBodies.item(0)
        
        for i in range(6):
             
            # Copy/paste body
            subComp1.features.copyPasteBodies.add(baseBody)
        
            baseBodyCopy = subComp1.bRepBodies.item(i+1)
            
            # Create a collection of entities for move
            bodies = adsk.core.ObjectCollection.create()
            bodies.add(baseBodyCopy)
            
            # Create a transform to do move
            vector = adsk.core.Vector3D.create(5 * i, 0, 0)
            transform = adsk.core.Matrix3D.create()
            transform.translation = vector
            
            moveFeats = subComp1.features.moveFeatures
            moveFeatureInput = moveFeats.createInput(bodies, transform)
            moveFeats.add(moveFeatureInput)

Error:

Failed:

Traceback (most recent call last):

File "...py", line 83, in run

moveFeats.add(moveFeatureInput)

File "/Library/Application Support/Autodesk/webdeploy/production/3f1b40e356e6df065e6a8f3470590c17c5502c2a/Autodesk Fusion 360.app/Contents/Api/Python/packages/adsk/fusion.py", line 21839, in add

return _fusion.MoveFeatures_add(self, input)

RuntimeError: 3 : invalid transform

[rocco.mayr · Accepted solution]

After reading this post I could solve the problem using TemporaryBRepManager and BaseFeature:

https://forums.autodesk.com/t5/fusion-360-api-and-scripts/built-in-circular-pattern-fusion-crashes-d...

# Get the root component of the active design.
rootComp = design.rootComponent

# Get the first sub component
occs = rootComp.occurrences
subComp1 = occs.item(0).component

# Get the first body in sub component 1
baseBody = subComp1.bRepBodies.item(0)

# Create a base feature
baseFeats = subComp1.features.baseFeatures
baseFeat = baseFeats.add()

# Get TemporaryBRepManager
tempBrepMgr = adsk.fusion.TemporaryBRepManager.get()
        
baseFeat.startEdit()

for i in range(6):
    # Creates a temporary copy of the input BRepBody
    tempBody = tempBrepMgr.copy(baseBody)
    TransformBody(tempBody, 5 * i)
    copiedBody = subComp1.bRepBodies.add(tempBody, baseFeat)

baseFeat.finishEdit()

def TransformBody(body, posX):
    # Get TemporaryBRepManager
    tempBrepMgr = adsk.fusion.TemporaryBRepManager.get() 
    
    transform = adsk.core.Matrix3D.create()
    transform.translation = adsk.core.Vector3D.create(posX, 0.0, 0.0)
    
    # Transforms the brep body using the specified transformation matrix
    tempBrepMgr.transform(body, transform)

TemporaryBRepManager:

https://help.autodesk.com/view/fusion360/ENU/?guid=GUID-2CA08FA9-8C23-4449-87C4-1CCBA87941C1

BaseFeature:

https://help.autodesk.com/view/fusion360/ENU/?guid=GUID-ddc16c4a-ea73-11e5-b9fc-3417ebd3d5be

[BrianEkins]

The reason for the failure is that the first time through the loop i is 0, which results in creating a zero length vector for the translation.  That's not valid for the Move feature so it's failing with an invalid transform error.

[rocco.mayr]

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@BrianEkins  schrieb:

The reason for the failure is that the first time through the loop i is 0, which results in creating a zero length vector for the translation.  That's not valid for the Move feature so it's failing with an invalid transform error.

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Good to know, thx