How is best to create a plane on a spline path?

[MichaelAubry]

Hi!  I'm continuing to build out my fibonacci script. It takes input values now!  I'm trying to make the program create a loft along a centerline but I'm getting stuck at creating the planes along the path I'll need to make loft profiles.  Can you take a look at my code?

Here's what I'm working towards:

Thank you!

Mike

import adsk.core, adsk.fusion

app= adsk.core.Application.get()

design = app.activeProduct

ui = app.userInterface

#**Default User Inputs**

steps = "5 cm" #How many steps of Fibonacci would you like to plot?

#(Note, while the steps variable should be unitless, right now our API can't handle unitless number.

#cm are the absolute units we use on the API side.)

length = "3 cm" #How long is the first segment? (cm)

input = steps

createInput = ui.inputBox('Enter Steps', 'Steps', input)

if createInput[0]:

(input, isCancelled) = createInput

unitsMgr = design.unitsManager

realSteps = unitsMgr.evaluateExpression(input, unitsMgr.defaultLengthUnits)

input = length

createInput = ui.inputBox('Enter Length', 'Length', input)

if createInput[0]:

(input, isCancelled) = createInput

realLength = unitsMgr.evaluateExpression(input, unitsMgr.defaultLengthUnits)

#Get root component

rootComp = design.rootComponent

#Create a new sketch on XY plane

sketch = rootComp.sketches.add(rootComp.xYConstructionPlane)

# Create an object collection for the points.

points = adsk.core.ObjectCollection.create()

# R = total steps to be run thru the For loop

R = int(realSteps - 2)

#starting x and y coordiantes

x = 0

y = 0

#Create 1st coordinate

points.add(adsk.core.Point3D.create(x,y,0))

#starting values for sequence

fib = 1

fib1 = 1

#Create 2nd coordinate

x = 1 * realLength

points.add(adsk.core.Point3D.create(x,y,0))

ui.messageBox('x: ' + str(x))

#bins for shifting x and y coordinates

Bin1 = range(0,R,4)

Bin2 = range(1,R,4)

Bin3 = range(2,R,4)

Bin4 = range(3,R,4)

for i in range(R):

fib2 = fib + fib1

fib = fib1

fib1 = fib2

fibLength = fib*realLength #adds the scalar component to coordinates

ui.messageBox('fiblength: ' + str(fibLength))

if i in Bin1:

x = x

y = y + fibLength

points.add(adsk.core.Point3D.create(x,y,0))

if i in Bin2:

x = x - fibLength

y = y

points.add(adsk.core.Point3D.create(x,y,0))

if i in Bin3:

x = x

y = y - fibLength

points.add(adsk.core.Point3D.create(x,y,0))

if i in Bin4:

x = x + fibLength

y = y

points.add(adsk.core.Point3D.create(x,y,0))

# Create the spline.

sketch.sketchCurves.sketchFittedSplines.add(points)

# Create the Planes for the loft

spline1 = sketch.sketchCurves.sketchFittedSplines.item(0)

plane1 = rootComp.ConstructionPlaneInput.setByDistanceOnPath.add(spline1,0)

[xiaohui.wang · Accepted solution]

Hi Michael,

Please have a try to replace 'plane1 = rootComp.ConstructionPlaneInput.setByDistanceOnPath.add(spline1,0)' with the following code .

    planeInput = rootComp.constructionPlanes.createInput() # you could also specify the occurrence in the parameter list

    planeInput.setByDistanceOnPath(spline1, adsk.core.ValueInput.createByReal(0))

    plane1 = rootComp.constructionPlanes.add(planeInput)

Besides, loft feature hasn't been included in the API yet. Sorry for the inconvenience.

Thanks,

Xiaohui

[MichaelAubry · Accepted solution]

Success!  Thanks so much. Your soluiton worked like a charm.  

Thanks for the warning that we don't have loft from the API yet.  Thats's okay. I'll just set the script up to get to that point.

Thank you!

Mike

[MichaelAubry]

For those following the thread, here's what the final solution ended up as.

Gallery Post: https://fusion360.autodesk.com/projects/horn-of-fibonacci

Code: https://github.com/MichaelAubry/Fusion360.git

Video: youtu.be/5wj6zj4-iB0

Big thanks to Brian, Xiaohui, and Casey for helping with this!

Best,

Mike