Searching for a way to identify the visible faces of a Mesh with respect to a PerspectiveCamera. I am not concerned about obscured or unobscured faces, just those that fall within or outside the camera's view. For instance, when observing a sphere and zooming in, some faces may extend beyond the camera frame while others remain in view. How can these specific faces be determined?
It appears that your approach to this problem is quite unique and interesting. Perhaps providing more context on how this test can be applied will yield more comprehensive responses.
One possible solution, based solely on the information provided, involves utilizing the Frustum.containsPoint() method. By generating a frustum from the camera and examining its intersection with the vertices of individual triangles, you can determine their visibility on screen.
If all three points of a triangle are encompassed within the frustum, then the entire triangle is visible. If only some points are included, it's partially visible, and if none are contained, it's occluded from view.
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