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But alas, when I line both of my cubes up (making one transparent) they are ever so slightly off. Any idea what I did wrong?

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I read that you first have to translate the FOV from Godot to blender using this formula: (360/pi)arctan(tan(GodotFOVpi/360)*16/9) My Fov in Godot is 4: Plugging into the formula I get 7.1 I then I did print("origin", self.global_transform.origin) and got: origin(157.213928, 294.901001, 157.213928) If I translate those coordinates to x, y, z in Blender they're waaay off. But if I switch z and y they are closer:

Godot uses Y up and Blender Z up. So that is normal. The FOV controls the camera, but what is displayed is a property of the viewport size. So both the Godot viewport and Blender viewport would need to be exactly the same amount of pixels.

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If you change the camera aspect to Keep Width in the Camera3D properties, you will get the same FOV calculation as Blender (horizontal FOV instead of vertical FOV). You then need to adjust the Godot camera FOV to be identical to the Blender camera FOV.

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