WebGLRenderer: Sort objects in clip space.

[eiriklegernaes]

Original PR #28474 was merged slightly early; here's the changes that the discussion in that PR landed on.

This PR changes the space in which objects are sorted from NDC to clip space, as well as adds Vector4.setFromMatrixPosition for convenience.

[github-actions]

📦 Bundle size

Full ESM build, minified and gzipped.

Filesize dev	Filesize PR	Diff
678.5 kB (168.2 kB)	678.6 kB (168.3 kB)	+129 B

🌳 Bundle size after tree-shaking

Minimal build including a renderer, camera, empty scene, and dependencies.

Filesize dev	Filesize PR	Diff
456.6 kB (110.3 kB)	456.7 kB (110.3 kB)	+118 B

[eiriklegernaes]

The doc-change broke a bunch of visual tests. I see a lot of Error creating WebGL context., another attempt... errors. Are these known to be flaky, or is this my fault somehow?

[Mugen87]

It's an issue of the E2E environment. We don't know why sometimes WebGL context creation fails. I'll rerun the failed test which is often the best approach to get a successful CI run.