Use scaledDirectionToPoint in occlusion computations #74
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WIP
I've been having issues with what seems like incorrectly culled tiles (especially at z0) so I started taking a look at the
horizonOcclusionPointvalues. I have no true understanding of the math involved 😅 but in comparing the implementation here with https://github.com/CesiumGS/cesium/blob/9295450e64c3077d96ad579012068ea05f97842c/packages/engine/Source/Core/EllipsoidalOccluder.js#L398I noticed this implementation wasn't making use of scaledDirectionToPoint like in the reference implementation.
At least on my side, this change has resulted in fixing the tiles being incorrectly culled in Cesium. I should probably add tests, and validate some other things first. Putting this up early for feedback in case I'm missing something.