Setting opacity flattens preserve-3d in CSS

 Fading in and out an animation by setting the overall opacity flattens the 3D effects.


I am adapting an animation of going through a star field. The stars move forwards with 'translateZ'. A 'transform-style' of 'preserve-3d' is set.


I added a 'keyframe' to the outer 'stage' changing the opacity from zero to one at the start, and one to zero at the end. But this changes the 'preserve-3d' in the children to 'flat' and the stars no longer move forwards.


I got around the problem by instead setting the opacity on each star.




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