The degenerate case - a point exactly on a collider's axis, where there is no
direction to push it - set the normal to (1, 0), which is already a unit vector,
and then divided it by the clamped d = 0.001 along with the genuine normals. The
push came out a thousand times too big: dead centre on a 0.5 m trunk moved a body
about 800 m rather than the 0.85 m that clears it.
Off-centre the arithmetic was right, and off-centre is how anything arrives at a
trunk on foot, so nothing in play ever hit it. A teleport, a spawn, or a world
generator dropping something onto an existing collider would have.
(ex, ez) / d is a unit vector for every d > 0, because d is its own length -
there was never anything to clamp and nothing that could grow. The normal is now
built once and explicitly, and the clamp is gone.
Verified through a game, which is the only harness this package has: render3d's
own float helpers need the Gl runtime spliced, so collide.ludic cannot be
compiled standalone for a unit test. Maroon Lake's selftest12 stands a body dead
centre on a trunk and asserts the push never exceeds the two radii added together
- which is the definition of being pushed clear, and so the tightest honest bound
available. It reports 798.88 m before this change and 0.80 m after, with the
off-centre case unchanged at 0.66 m.
Orkuncakilkaya
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