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Le 27/08/2015 21:45, "Jörg \"Yadgar\" Bleimann" a écrit :
> #if (ballpos_next.x > xmin & ballpos_next.x < xmax & ballpos_next.z
> > zmin & ballpos_next.z < zmax) #declare dir = 360-dir; #declare
> hit=1;

* that's seems to detect a pinball's hit: ball hitting a nail on its
center.

* 360-dir is not the opposite direction.

hitting a bumber to get the opposite direction: dir = (dir+180)%360

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

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



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