llRot2Euler

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Revision as of 11:06, 1 February 2013 by Omei Qunhua (talk | contribs) (Add comment on radians. Avoid unwise hard-coded rotation. Add a 2nd example.)
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Summary

Function: vector llRot2Euler( rotation quat );

Returns a vector that is the Euler representation (roll, pitch, yaw) of quat, with each component expressed in radians.

• rotation quat Any valid rotation

Caveats

  • Angles greater than PI radians (180 degrees) are returned as negative angles.
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Examples

<lsl> default {

   state_entry()
   {
       rotation input = llGetRot();
       llSay(0, "The Rot2Euler of " + (string)input + " is: " + (string) llRot2Euler(input) );
   }

} </lsl>

<lsl> // This script rotates a prim by 15 degrees each time the prim is touched

// While not the best way of achieving the result, // this script demonstrates the use of llRot2Euler and llEuler2Rot // and the use of more human-friendly degrees rather than radians

default {

   touch_start(integer total_number)
   {
       // Get the object's current rotation as a quarternion
       rotation rot = llGetRot();
       // Convert the rotation to a euler with roll, pitch, and yaw in radians
       vector euler = llRot2Euler(rot);
       // convert the angles from radians to degrees
       euler *= RAD_TO_DEG;
       // Add 15 degrees on the Z axis        
       euler += <0, 0, 15>;
       // Say the current euler values in degrees
       llSay(0, (string) euler);         
       // convert degrees back to radians
       euler *= DEG_TO_RAD;
       // Convert the euler back to a rotation quarternion
       rot =  llEuler2Rot (euler);
       // Apply the updated rotation to the prim   
       llSetRot( rot ); 
   }

}

</lsl>

See Also

Functions

•  llEuler2Rot

Articles

•  "Wikipedia logo"Euler Angles

Deep Notes

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Signature

function vector llRot2Euler( rotation quat );