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

# Number of divisions during one revolution
COUNT = 60

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

        # get state
        vi :adsk.core.Viewport = app.activeViewport
        camera :adsk.core.Camera = vi.camera #This is a deep copy.
        eye :adsk.core.Point3D = camera.eye
        tgt :adsk.core.Point3D = camera.target
        up :adsk.core.Vector3D = camera.upVector
        baseArea = camera.viewExtents

        # get matrix
        front :adsk.core.Vector3D = eye.vectorTo(tgt)
        right :adsk.core.Vector3D = up.copy()
        right = right.crossProduct(front)
        mat :adsk.core.Matrix3D = adsk.core.Matrix3D.create()
        mat.setWithCoordinateSystem(tgt, right, front, up)

        # get position & ratio
        unit = math.radians(360 // COUNT)
        rads = [unit] * COUNT
        ratios = [random.uniform(0.1, 5.0) for _ in range(COUNT)]
        if 360 % COUNT != 0:
            rads.append(math.radians(360 % COUNT))
            ratios.append(1)

        # show
        camera.isSmoothTransition = False
        for rad, ratio in zip(rads, ratios):
            mat.setToRotation(rad, up, tgt)
            eye.transformBy(mat)
            up.transformBy(mat)
            mat.setToRotation(rad, right, tgt)
            eye.transformBy(mat)
            up.transformBy(mat)
            # mat.setToRotation(rad, front, tgt)
            camera.eye = eye
            camera.upVector = up
            # zoom = baseArea * ratio
            # camera.viewExtents = zoom

            vi.camera = camera
            vi.refresh()
            adsk.doEvents()

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