Hi(gh)!

And I thought I got it right... forget about it! While with speed=0.1 
and starting angle=60 degrees all went fine, with speed=0.25 and 
starting angle=340 degrees, at frame 219 the script starts to behave 
bizarrely. As you can see in the attached video clip, the ball bounces 
off a non-existing "horizontal" wall and then moves through the eastern 
wall...

This is the collision detecting routine:

#declare rows=0; // check for collision with any stone
#while (rows < LevelLength)
   #declare cols=0;
   #while (cols < LevelWidth)
     // #warning concat("row: ", str(rows, 1, 0), ", col: ", str (cols, 
1, 0))
     #if (layer2_array[rows][cols] = 1 | layer3_array[rows][cols] >= 20)
       #declare xmin=cols-0.35;
       #declare xmax=cols+1+0.35;
       #declare zmin=rows-0.35;
       #declare zmax=rows+1+0.35;
       // horizontal obstacles
       #if (ballpos_next.x >= xmin & ballpos_next.x <= xmax & 
ballpos_next.z >= zmin & ballpos_next.z <= zmax & (ballpos.z < zmin | 
ballpos.z > zmax))
         #declare dir = 180-dir;
	#declare hit=1;
	#break
       #end
       // vertical obstacles
       #if (ballpos_next.x >= xmin & ballpos_next.x <= xmax & 
ballpos_next.z >= zmin & ballpos_next.z <= zmax & (ballpos.x < xmin | 
ballpos.x > xmax))
         #declare dir = -dir;
	#declare hit=1;
	#break
       #end
     #end
     #declare cols=cols+1;
   #end
   #if (hit)
     #break
   #end
   #declare rows=rows+1;
#end

These are the values at frame 219:

xmin = 18.65
xmax = 20.35
zmin = 3.65
zmax = 5.35

ballpos = <18.6344,0,4.38568> 	
ballpos_next = <18.7199,0,4.15076>

Now let's check both #if conditions:

Horizontal ("west-east") obstacles:
#if (ballpos_next.x >= xmin & ballpos_next.x <= xmax & ballpos_next.z 
 >= zmin & ballpos_next.z <= zmax & (ballpos.z < zmin | ballpos.z > zmax))

ballpos_next.x >= xmin TRUE
ballpos_next.x <= xmax TRUE
ballpos_next.z >= zmin TRUE
ballpos_next.z <= zmax TRUE
ballpos.z < zmin FALSE
ballpos.z > zmax FALSE

...so the following block should NOT be executed! But in fact it does! 
Why? WHY?? WHY??? Am I too feeble-minded to understand this?!?

See you in Khyberspace!

Yadgar

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Download 'povigma_level0001_topview_0-25_340_newtexture.mp4.mpg' (1040 KB)