Far camera jumps via W3DView::lookAt will render terrain black for 1 frame in Generals

[xezon]

Far camera jumps via W3DView::lookAt will render terrain black for 1 frame. Reproducible by clicking on the Radar to jump far positions. Happens in Generals only. Bug was was introduced with #2280

[xezon]

I do not understand why this happens. Camera and Heightmap code is in Core, yet the bug does not occur in Zero Hour.

[Mr-Sheerlock]

Might there be a difference in Maths implementation between both games? or perhaps in the cache policies (if there is)?