topic How do i create circular pattern in sketch using API? in Fusion API and Scripts Forum

How do i create circular pattern in sketch using API?

Anonymous — Sun, 30 Aug 2015 17:53:37 GMT

I'm wokring on a little helical gear gernerator.

I have a sketch with gear tooth outline made from a few arcs and splines.

I'm trying to make a circular pattern in the sketch to copy the teeth shape around the gear.

I can't seem to find the right API to do a Circular Pattern as I can do in the sketch editor.

I tried to use the only API that seemed to work with Circular patterns (circularPatternFeatures), but it does not work for me:

                        var stuff_to_pattern = adsk.core.ObjectCollection.create();

                        stuff_to_pattern.add(left_bottom_arc);
                        stuff_to_pattern.add(left_involute);
                        stuff_to_pattern.add(top_arc);
                        stuff_to_pattern.add(right_involute);
                        stuff_to_pattern.add(right_bottom_arc);

                        var pattern_input = root.features.circularPatternFeatures.createInput(stuff_to_pattern, root.zConstructionAxis);
                        pattern_input.quantity = adsk.core.ValueInput.createByReal(teeth);
                        root.features.circularPatternFeatures.add(pattern_input);

When I run this I get an error saying "inputEntities should be of a single type."

I am confused. Am I using the wrong thing?

Re: How do i create circular pattern in sketch using API?

ekinsb — Mon, 31 Aug 2015 03:07:42 GMT

There are two different pattern commands in Fusion. One when working with sketches and one when working with the model. The commands are completely different and support different capabilities. The API currently only supports patterning in the model and not a sketch.

In many cases, it's better to do the patterning in the model anyway. For example, in your case, you can create the sketch for a single gear tooth and then use it to create a single gear tooth in the model and then pattern it to create the full gear.

Re: How do i create circular pattern in sketch using API?

marcinszydlowski.1984 — Sun, 16 Sep 2018 07:43:39 GMT

Hello all,

I know this is probably outdated but I had similar problem: I had a sketch but i wanted pattern without extruding shapes. It can be easily done by copying sketch elements using rotations. If someone has still problem with such cases, here are simple solution for rotating on XY plane:

    entities = adsk.core.ObjectCollection.create()
    entities.add(filletLeft)
    entities.add(rootLineLeft)
    entities.add(splineLeft)
    entities.add(toothTipCurve)
    entities.add(splineRight)
    entities.add(rootLineRight)
    entities.add(filletRight)
        
    normal = sketch.xDirection.crossProduct(sketch.yDirection)
    normal.transformBy(sketch.transform)
    origin = sketch.origin
    origin.transformBy(sketch.transform)
    rotationMatrix = adsk.core.Matrix3D.create()
    step = 2 * math.pi / teethNumber

    for i in range(1, int(teethNumber)):
        rotationMatrix.setToRotation(step * i, normal, origin)
        sketch.copy(entities, rotationMatrix)

Betreff: How do i create circular pattern in sketch using API?

adminTCYL2 — Thu, 08 Jul 2021 08:38:27 GMT

Thank you for this nice pice of code! It helped me a lot!