Difference between revisions of "LlRot2Fwd"

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|return_type=vector|p1_type=rotation|p1_name=q
 
|return_type=vector|p1_type=rotation|p1_name=q
 
|func_desc=Computes the orientation of the {{HoverText|local x-axis|front-direction of prim}} relative to {{HoverLink|Viewer_coordinate_frames#Global|global coordinate system|the earth}}.
 
|func_desc=Computes the orientation of the {{HoverText|local x-axis|front-direction of prim}} relative to {{HoverLink|Viewer_coordinate_frames#Global|global coordinate system|the earth}}.
|return_text=that is the forward vector defined by '''q''', i.e. a unit vector pointing in the local positive X direction.
+
|return_text=that is the forward vector defined by {{LSLP|q}}, i.e. a unit vector pointing in the local positive X direction.
 
|func_footnote=Can be useful to identify the orientation of the local {{HoverText|frontal-plane|coronal-plane}} of the prim, since it's x-axis is always perpendicular to this local frontal plane.
 
|func_footnote=Can be useful to identify the orientation of the local {{HoverText|frontal-plane|coronal-plane}} of the prim, since it's x-axis is always perpendicular to this local frontal plane.
 
|spec=Mathematically equivalent to:
 
|spec=Mathematically equivalent to:
 
<lsl>ret = llVecNorm(<1., 0., 0.> * q);</lsl>
 
<lsl>ret = llVecNorm(<1., 0., 0.> * q);</lsl>
If '''q''' is known to be a unit quaternion then it can be simplified as:
+
If {{LSLP|q}} is known to be a unit quaternion then it can be simplified as:
 
<lsl>ret = <1., 0., 0.> * q;</lsl>
 
<lsl>ret = <1., 0., 0.> * q;</lsl>
 
|caveats
 
|caveats

Revision as of 11:14, 29 June 2012

Summary

Function: vector llRot2Fwd( rotation q );

Computes the orientation of the local x-axis relative to the earth.
Returns a vector that is the forward vector defined by q, i.e. a unit vector pointing in the local positive X direction.

• rotation q

Can be useful to identify the orientation of the local frontal-plane of the prim, since it's x-axis is always perpendicular to this local frontal plane.

Specification

Mathematically equivalent to: <lsl>ret = llVecNorm(<1., 0., 0.> * q);</lsl> If q is known to be a unit quaternion then it can be simplified as: <lsl>ret = <1., 0., 0.> * q;</lsl>

Examples

See Also

Functions

•  llRot2Left
•  llRot2Up
•  llRot2Axis
•  llRot2Angle

Deep Notes

Search JIRA for related Issues

Signature

function vector llRot2Fwd( rotation q );