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With primitives you can manipulate its position and orientation by simply altering its modelMatrix property. With entities you can manipulate its Cartesian3 position by altering its position property and its Quanternion orientation by altering its orientation property. However, one might already have orientation in the form of 3 orthogonal vectors which is the form that modelMatrix uses. Does one have to convert to Quanternion orientation form for entities? Also, is entity orientation always in terms of the ENU frame of the entity position?
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