Get Mat4 perspective of entity by the view of camera?

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#1

I’m trying to “bind” the DOM element to entity, the position is already obtained, but what about the projection?

How to get a plane matrix that would be usable for a DOM element, according to the camera view projection?

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#2

Are you looking to use CSS 3D to put the DOM over the plane? eg Perspective · Intro to CSS 3D transforms

Not sure how the perspective value is calculated in CSS myself. This now unsupported project https://playcanvas.com/project/751877/overview/youtube-in-3d-scenes did something like this so may help as a starting point.