Difference between revisions of "LlAxes2Rot"

Revision as of 09:03, 6 April 2008

Function: rotation llAxes2Rot( vector fwd, vector left, vector up );

Returns a rotation that is defined by the 3 coordinate axes

All three vectors must be mutually orthogonal unit vectors.

<lsl> default {

   state_entry()
   {
       vector i = <  1.0,  0.0,  0.0>;
       vector j = <  0.0,  1.0,  0.0>;
       vector k = <  0.0,  0.0,  1.0>;

       rotation rot = llAxes2Rot( j, -i, k );

       llSay(0, (string) (llRot2Euler(rot) * RAD_TO_DEG) );
   }

}</lsl>

This script shows that (j, -i, k) is obtained by rotating (i, j, k) 90 degrees around z direction.

Technically, only the first two vectors are needed to define this rotation, which can be done by calling:

llAxes2Rot(fwd, left, fwd % left);

Signature
function rotation llAxes2Rot( vector fwd, vector left, vector up );

@@ Line 17: / Line 17: @@
      state_entry()
      {
-         rotation rot = llAxes2Rot(
+         vector i = <  1.0,  0.0,  0.0>;
-            <  0.0,  1.0,  0.0>,
+        vector j = <  0.0,  1.0,  0.0>;
-            < -1.0,  0.0,  0.0>,
+        vector k = <  0.0,  0.0,  1.0>;
-            <  0.0,  0.0,  1.0>);
+        rotation rot = llAxes2Rot( j, -i, k );
          llSay(0, (string) (llRot2Euler(rot) * RAD_TO_DEG) );
@@ Line 26: / Line 27: @@
 }</lsl>
-This script shows that ('''fwd''', '''left''', '''up''') = ('''j''', '''-i''', '''k''') is obtained by rotating ('''i''', '''j''', '''k''') 90 degrees around z direction.
+This script shows that ('''j''', '''-i''', '''k''') is obtained by rotating ('''i''', '''j''', '''k''') 90 degrees around z direction.
 |helpers
 |also_functions