fSpy

While is natively designed with a Blender importer, you can integrate it into your 3ds Max workflow using third-party scripts or manual data entry. 1. Dedicated Importer Script

  1. Parallel Lines: In fSpy, set the Vanishing Point mode to "Parallel" for one or both axes. This tells fSpy that the lines do not converge (which simulates an orthographic top view or a very long focal length).
  2. Spine Axis: If you are matching a true perspective "top" view (like a drone photo), define your X and Y axes carefully. The steep angle often makes the vanishing points fall far outside the image canvas.

When to use Top-Down fSpy

Step 2: Run the Script

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