Animate entity properties

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Properties supported by the scene adapter are Position, Scale (Size), Rotation, Color, Opacity, and Fov. Position/scale/color use three numbers; rotation uses a nonzero quaternion [x, y, z, w]. FOV is in radians and requires a perspective camera. Opacity and RGB are clamped to [0, 1]. Opacity updates material alpha and the renderer uses alpha blending. Audio voices additionally expose Volume and Pitch. For script/component/UI values, use Tween.value or Animation.value with an update callback. The property adapter is extensible; arbitrary component reflection is not part of this API.

A tween captures its starting value when it first advances. Sequence children capture their starts when reached, so earlier movement is respected. If several actions write the same property, the action created last writes last each frame. Avoid competing physics or ordinary Update setters on that property.