Triangle Button

This is a function to tell if a point is within a 2d triangle. Code converted from http://www.blackpawn.com/texts/pointinpoly/to LSL by Richardjrn Weatherwax

<lsl> //Converted to LSL by Richardjrn Weatherwax from http://www.blackpawn.com/texts/pointinpoly/ //Done on request of Ezri Fairy (snow.gravois)

vector pointA = <0.17810, 0.36214, 0.00000>; vector pointB = <0.81144, 0.38803, 0.00000>; vector pointC = <0.50132, 0.71068, 0.00000>;

integer SameSide(vector p1, vector p2, vector a, vector b) {

   vector cp1 = (b-a)%(p1-a);
   vector cp2 = (b-a)%(p2-a);
   if((cp1*cp2)>=0)return TRUE;
   else return FALSE;

}

integer PointInTriangle(vector p, vector a, vector b, vector c) {

   if(SameSide(p,a, b,c)&&SameSide(p,b, a,c)&&SameSide(p,c, a,b))return TRUE;
   else return FALSE;

}

default {

   touch_start(integer total_number)
   {
       if(PointInTriangle(llDetectedTouchST(0),pointA,pointB,pointC))llOwnerSay("In the triangle");
       else llOwnerSay("Outside the triangle");
   }

} </lsl>