I made a block (8 x 24 quants) as a map entity. Center at 12,4.
Now I try to move this block horizontaly with 8 quants per mouse click in a field with barriers around it.
The block starts hugging the left wall.
So I trace 20 quants (12+8) to the right and the left, to see if there are any obstacles.
variables;
Code:

---

var trace_right[3];
var trace_left[3];
var dist_left;
var dist_right;

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And in a function (only movement to the right is displayed);
Code:

---

function move_slider_event()
{
 	..............
 	vec_set(trace_right,vector(20,0,0));
 	dist_right=c_trace(my.x,trace_right.x,ignore_me|use_polygon);
        vec_set(trace_left,vector(20,0,0));
 	vec_rotate(trace_left,vector(180,0,0));
 	dist_left=c_trace(my.x,trace_left.x,ignore_me|use_polygon);
 	if(dir_right==0)
 	{
		c_move(my,vector8,0,0),nullvector,ignore_me|use_polygon);
 	}
 	..............
}

---

When I look at the values of dist_right and dist_left, they never get 0, while there is no obstical at the right side, it gives a number higher then the place of the barrier.
(dist_left should be 12 to my opinion and dist_right 0)
I thought that in c_trace the second value is how far to trace, so the value dist_right should be 0, because in the trace distance there is no obstical.
But now I think that I am totaly wrong about this. Can somebody explain to me how the c_trace works???? (I have already looked in aum 56).
--------
I also tried out in the action for the block;
Code:

---

action slider_act
{
	my.enable_stuck=on;
	my.enable_block=on;
	my.enable_entity=on;
	my.event=move_slider_event;
	...........
}

---

And in the function, if the block hits the wall or another entity, revers the direction;
Code:

---

.................
	if(event_type==event_stuck||event_type==event_block)
	{
        	beep();
		if(direction==1) {direction=-1;} else {direction=1;}
	}
 ..................

---

But that does not work either. When the block hits the wall, the event is not called.
Am I doing something wrong here, can somebody explain this to me????

c_trace will send a ray from a starting point in the coordinate system to another so you would need to set the point relative to your starting point. For example if your starting point is the box(my.x,my.y,my.z) and you want to trace along the X axis 10 units the second vector would be((my.x + 10),my.y,my.z)...

Thanks, that make sence. I forgot to add in the second vector the my.position so I think that the trace was form the center (green lines) instead of from the entity.

Now I change the script as follows (again only the horizontal moving is showing)
Code:

---

	// trace to the right
	vec_set(trace_right,vector(my.x+scan_dist,my.y,my.z));
	dist_right=c_trace(my.x,trace_right.x,ignore_me|use_polygon);
	if(dist_right==0 && move_left==0)
	{
		c_move(my,vector(8,0,0),nullvector,ignore_me|ignore_maps);
		// second trace after moving
		dist_right=c_trace(my.x,trace_right.x,ignore_me|use_polygon);
		if(dist_right==0)
		{
			move_right=1;
			move_left=0;
		}
		else
		{
			move_right=0;
			move_left=1;
		}
	}
	else
	{
		// trace to the left
		beep();
		vec_set(trace_left,vector(my.x-scan_dist,my.y,my.z));
		dist_left=c_trace(my.x,trace_left.x,ignore_me|use_polygon);
		if(dist_left==0 && move_right==0)
		{
			c_move(my,vector(-8,0,0),nullvector,ignore_me|ignore_maps);
			// second trace after moving
			beep();
			dist_left=c_trace(my.x,trace_left.x,ignore_me|use_polygon);
			if(dist_left==0)
			{
				move_right=0;
				move_left=1;
			}
			else
			{
			move_right=1;
			move_left=0;
			}
		}
	}

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Now I can move the slider to the right, but when it hits the barrier, I only hear the first beep and the slider will not move to the left.
What am I doing wrong here? Please help?