rotating sketch that is on another plane around ConstractionPlaneAxis

adminTCYL2 · ‎07-07-2021

On the end of a path sits a plane with a circle:

Now I want to rotate and copy the circle around its basis, so it looks like flowers growing from one Point.
Doing it by hand is no problem:

But in my api-Script only the lines get rotated right. The circles rotate around their plane. This is not what I want.
How can I fix it?
(PS: Workarounds like rotating just the line and draw new planes or the use of pattern feature do not help me, because this ist just a simplified example of a much more complex script where I need to rotate a sketch that way.)

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

def run(context😞

ui = None

try:

app = adsk.core.Application.get()

ui = app.userInterface

design = app.activeProduct

root_comp = design.rootComponent

# Create a 3 identical lines.

sketches = root_comp.sketches

xyPlane = root_comp.xYConstructionPlane

sketch = sketches.add(xyPlane)

line = sketch.sketchCurves.sketchLines.addByTwoPoints(adsk.core.Point3D.create(0, 0, 0), adsk.core.Point3D.create(0, 2, 2))

# create plane on the end of the line

path1 = root_comp.features.createPath(line)

planes = root_comp.constructionPlanes

planeInput = planes.createInput()

one = adsk.core.ValueInput.createByReal(1)

planeInput.setByDistanceOnPath(path1, one)

plane = planes.add(planeInput)

# create 3 identical circles on the plane

sketch1 = sketches.add(plane)

circle = sketch1.sketchCurves.sketchCircles.addByCenterRadius(adsk.core.Point3D.create(0,0,0), 1)

# Try to rotate two circles around root_comp.constructionPlane axis (does not work)

sketch = root_comp.sketches.item(0)

sketch1 = root_comp.sketches.item(1)

objects1 = adsk.core.ObjectCollection.create()

objects1.add(sketch.sketchCurves.item(0)) #that's the line

objects1.add(sketch1.sketchCurves.item(0)) #that's the circle

objects2 = adsk.core.ObjectCollection.create()

objects2.add(sketch.sketchCurves.item(1)) #that's another line

objects2.add(sketch1.sketchCurves.item(1)) #that's another circle

normal = adsk.core.Vector3D.create(0,1,0) #sketch.xDirection.crossProduct(sketch.yDirection)

normal.transformBy(sketch.transform)

origin = sketch.origin

origin.transformBy(sketch.transform)

matrix1 = adsk.core.Matrix3D.create()

matrix2 = adsk.core.Matrix3D.create()

matrix1.setToRotation( 2*math.pi/3, normal, origin)

matrix2.setToRotation(-2*math.pi/3, normal, origin)

sketch.move(objects1, matrix1)

sketch.move(objects2, matrix2)

except:

if ui:

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

kandennti · ‎07-08-2021

Hi @adminTCYL2 .

I think it's because the Line and Circle are drawn on different sketches and "sketch.move" is used to move them, so the result is not what I want.

I tried various Matrix3D calculations, but my mind got confused and I gave up...

Instead, I created Lines and Circles in the same sketch and used the Copy method.

# Fusion360API Python script
import adsk.core, adsk.fusion, adsk.cam, traceback, math

def run(context):
    ui = None
    try:
        app = adsk.core.Application.get()
        ui  = app.userInterface
        design = app.activeProduct
        root_comp = design.rootComponent

        # create Skecth
        sketches = root_comp.sketches
        xyPlane = root_comp.xYConstructionPlane
        sketch :adsk.fusion.Sketch  = sketches.add(xyPlane)
        sktCrvs :adsk.fusion.SketchCurves = sketch.sketchCurves

        # create Line
        line :adsk.fusion.SketchLine = sktCrvs.sketchLines.addByTwoPoints(
            adsk.core.Point3D.create(0, 0, 0),
            adsk.core.Point3D.create(0, 2, 2)
        )

        # create Circle
        circle :adsk.fusion.SketchCircle = sktCrvs.sketchCircles.addByCenterRadius(
            adsk.core.Point3D.create(0,0,0),
            1
        )

        # create Plane
        # https://help.autodesk.com/view/fusion360/ENU/?guid=GUID-9fdb167b-77dd-457c-a1be-2df1ea7e1c29
        vec :adsk.core.Vector3D = line.startSketchPoint.geometry.vectorTo(line.endSketchPoint.geometry)
        vec.normalize()
        plane :adsk.core.Plane = adsk.core.Plane.create(line.endSketchPoint.geometry, vec)

        # get Matrix
        mat :adsk.core.Matrix3D = adsk.core.Matrix3D.create()
        mat.setWithCoordinateSystem(
            line.endSketchPoint.geometry,
            plane.uDirection,
            plane.vDirection,
            vec
        )

        # move Circle
        objs :adsk.core.ObjectCollection = adsk.core.ObjectCollection.create()
        objs.add(circle)
        sketch.move(objs, mat)


        # get Matrix
        normal =  adsk.core.Vector3D.create(0,1,0)
        normal.transformBy(sketch.transform)
        origin = sketch.origin
        origin.transformBy(sketch.transform)
        matrix1 = adsk.core.Matrix3D.create()
        matrix2 = adsk.core.Matrix3D.create()
        matrix1.setToRotation( 2*math.pi/3, normal, origin)
        matrix2.setToRotation(-2*math.pi/3, normal, origin)

        # create clone Line Circle
        # https://help.autodesk.com/view/fusion360/ENU/?guid=GUID-899a5797-8bc8-4060-9321-5f81697e0dec
        objs.clear()
        objs.add(line)
        objs.add(circle)

        for mat in [matrix1, matrix2]:
            sketch.copy(
                objs,
                mat)

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

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adminTCYL2 · ‎07-08-2021

I found a work-around ... but it does not satisfy me, because it would be much afford, if the sketch on the plane is not just a simple circle. The Idea is to construct three points of the circle, transform them into worldGeometry and construct the circle in worldGeometry not on the plane. Now it is rotateable. You can see the three points in the sketch:
This helped me: https://forums.autodesk.com/t5/fusion-360-api-and-scripts/how-do-i-create-circular-pattern-in-sketch...

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

def run(context😞

ui = None

try:

app = adsk.core.Application.get()

ui = app.userInterface

design = app.activeProduct

root_comp = design.rootComponent

# Create a line in three dimensions.

sketches = root_comp.sketches

xyPlane = root_comp.xYConstructionPlane

sketch = sketches.add(xyPlane)

line = sketch.sketchCurves.sketchLines.addByTwoPoints(adsk.core.Point3D.create(0, 0, 0), adsk.core.Point3D.create(0, 2, 2))

# create plane on the end of the line

path1 = root_comp.features.createPath(line)

planes = root_comp.constructionPlanes

planeInput = planes.createInput()

one = adsk.core.ValueInput.createByReal(1)

planeInput.setByDistanceOnPath(path1, one)

plane = planes.add(planeInput)

# create 3 Points on the plane, transform them into worldGeometry and

# sketch a circle trough, witch is in WorldGeometry and not on the plane.

sketch1 = sketches.add(plane)

p1 = sketch1.sketchPoints.add(adsk.core.Point3D.create(0, 1,0))

p2 = sketch1.sketchPoints.add(adsk.core.Point3D.create(0,-1,0))

p3 = sketch1.sketchPoints.add(adsk.core.Point3D.create(1, 0,0))

p1a = p1.worldGeometry

p2a = p2.worldGeometry

p3a = p3.worldGeometry

circle = sketch.sketchCurves.sketchCircles.addByThreePoints(p1a,p2a,p3a)

# Rotate all two times

sketch = root_comp.sketches.item(0)

objects = adsk.core.ObjectCollection.create()

objects.add(sketch.sketchCurves.item(0)) #that's the line

objects.add(sketch.sketchCurves.item(1)) #that's the circle

normal = adsk.core.Vector3D.create(0,1,0)#that's the axis

normal.transformBy(sketch.transform)

origin = sketch.origin

origin.transformBy(sketch.transform)

matrix = adsk.core.Matrix3D.create()

for i in range(1, 3😞

matrix.setToRotation(2*math.pi/3 * i, normal, origin)

sketch.copy(objects, matrix)

# #if just one rotation is needed use this instead:

# matrix.setToRotation( 2*math.pi/3, normal, origin)

# sketch.copy(objects, matrix) # or sketch.move(objects, matrix)

except:

if ui:

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

adminTCYL2 · ‎07-08-2021

Is there someone who realy knows how to rotate sketches in worldGeometry that are on other planes?
I mean: There must be a way, because I can do it in Fusion by hand. So why not in the api?
Rotations allways should use the geometry of the axes not of the sketches. Otherwise rotations lead to unexpected results. Rotate-feature in the api is not programmed user-friendly.

adminTCYL2 · ‎07-09-2021

Thank you Kandennti, that is a nice pice of code. I will have to play around with it, before I fully understand what is going on. As far as I see you create the circle in the center of the xy-plane and somehow it gets up to the end of the lines by the roation?
Good to hear, that your mind got confused... so I am not the only one 🙂

kandennti · ‎07-09-2021

@adminTCYL2 .

This is because SketchCircle can always be created only in the XY plane (referencePlane) of the sketch.

https://help.autodesk.com/view/fusion360/ENU/?guid=GUID-15d12c6c-e604-488a-8f62-8fa1547c653c

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rotating sketch that is on another plane around ConstractionPlaneAxis

rotating sketch that is on another plane around ConstractionPlaneAxis

rotating sketch that is on another plane around ConstractionPlaneAxis