Building an object in a local coordinate system

[kurt-rhee]

Hello,

I was wondering if it would be possible to create an object in a local frame and then convert it once it is done to the world frame. For example would it be possible to create a polygon:

    polygon = Polygon([
        [0, 0, 0],
        [1, 0, 0],
        [1, 1, 0],
        [0, 1, 0]
    ])

I would like this polygon to be situated at the origin in the local frame, but translated in the world frame.

[kurt-rhee]

    local_coordinate_system = Frame(
        point=bay_origin,
        xaxis=bay_x_axis,
        yaxis=bay_y_axis
    )
    to_lcs = Transformation.from_frame_to_frame(
        Frame.worldXY(),
        local_coordinate_system
    )

    # --- bay polygon object ---
    # create a 2d bay object centered on the torque tube
    polygon = Polygon([
            [0, 0, 0],
            [1, 0, 0],
            [1, 1, 0],
            [0, 1, 0]
        ])
    polygon.transform(to_lcs)

From what I've seen, I build an object in the world coordinate system and then send it as a transformation into the local coordinate system

[tomvanmele]

if i understand correctly, what you're looking for is this...

from compas.geometry import Polygon
from compas.geometry import Frame
from compas.geometry import Transformation

from compas_view2.app import App

polygon = Polygon([[0, 0, 0], [1, 0, 0], [1, 1, 0], [0, 1, 0]])
frame = Frame([1, 1, 0], [1, 0, 0], [0, 0, 1])
transformation = Transformation.from_frame(frame)

polygon.transform(transformation)

viewer = App()
viewer.add(polygon)
viewer.add(frame, size=0.5, linewidth=5)
viewer.run()

[kurt-rhee]

Hello, Thank you, I understand now. Best, Kurt Message ID: ***@***.*** .com>