llVecDist

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/LSL

VecDist

llVecDist

Summary

Function: float llVecDist( vector vec_a, vector vec_b );

0.0	Forced Delay
10.0	Energy

Returns a float that is the undirected nonnegative distance between vec_a and vec_b.

• vector	vec_a	–	Any valid vector
• vector	vec_b	–	Any valid vector

Examples

default {
    state_entry()
    {
        vector input_1 = <1.0,2.0,3.0>;
        vector input_2 = <3.0,2.0,1.0>;
        llOwnerSay("The distance between " + (string) input_1 +
            " and " + (string) input_2 + " is: "+(string)llVecDist(input_1, input_2) );
    }
}

//To reset script on touch if the object has been rotated since the last script reset
float gTolerance = 0.05;  //This corresponds to about a 3 degree rotation
default
{
	state_entry()
	{
		llSetObjectDesc((string)llRot2Euler(llGetRot()));
	}
	
	touch_start(integer total_number)
	{
		if (llVecDist(llRot2Euler(llGetRot()), (vector)llGetObjectDesc()) > gTolerance)
		{
			llSay(0,"This object has rotated. Automatic reset engaged.");
			llResetScript();
		}
	}
}

Video Tutorial

<videoflash type="youtube">D0WvH58IWEo|640|385</videoflash>

Notes

• Mathematically equivalent to:
  • llVecMag( vec_a - vec_b )
  • llSqrt( (vec_b.x - vec_a.x) * (vec_b.x - vec_a.x) + (vec_b.y - vec_a.y) * (vec_b.y - vec_a.y) + (vec_b.z - vec_a.z) * (vec_b.z - vec_a.z) )
• Knowing this, there are ways to circumvent llVecDist for more efficient code.
  • For example, vector v3 = (v1-v2); v3*v3 < (f*f); is over twice as fast as llVecDist(v1,v2) < f;

See Also

Functions

•	llVecMag
•	llVecNorm

Deep Notes

Signature
function float llVecDist( vector vec_a, vector vec_b );

Haiku
Squirrel on a wire, Skips from pole to distant pole. One leap at a time.