Hi(gh)!

> You should detect walls' hit, and there is horizontal walls and
> vertical walls. Both are harder to handle with a single dir variable.
>
> Horizontal wall, reflecting the vertical component.
> Vertical wall, reflecting the horizontal component.
>
> Assuming 0 is North, 180 is South, 90 is East.
>
> Horizontal wall: 0->180, 180->0, 90->90, 270->270, 30->150, 80->100

which would yield the formula; dir = 180-dir

> Vertical wall: 0->0, 180->180, 90->270, 270->90, 30->330, 80->280

equalling dir = 360-dir - or just dir = -dir

Meanwhile I found out that my conditions left out the (rare) case that 
the z coordinate of the ball's position in the last frame before 
"entering" a stone is equal to that of the stone's southern face... I 
fixed this (and also re-activated the branch for the vertical walls) and 
now it runs fine (see attached video)!

Thank you for motivating me!

See you in Khyberspace!

Yadgar

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