In ThreeJS, why do objects have an up property?
i.e. https://threejs.org/docs/#api/en/core/Object3D.up
Isn't an object's up just its y axis?
Is there a difference between up and y?
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raphisama
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Different 3D tools may have different directions for the Y and Z axis. Some 3D tools are Y-Up, which means the Y axis is a vertical line; while the others are Z-Up, means the Z axis is a vertical line. – Stranger in the Q Oct 01 '20 at 19:45
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There are reference systems where the up can be Z. – juagicre Oct 20 '20 at 07:16