Difference between revisions of "LlRot2Left"
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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 y-axis|left-direction of prim}} relative to {{HoverLink|Viewer coordinate frames#Global|global coordinate system|the earth}}. | |func_desc=Computes the orientation of the {{HoverText|local y-axis|left-direction of prim}} relative to {{HoverLink|Viewer coordinate frames#Global|global coordinate system|the earth}}. | ||
|return_text=that is the left vector defined by | |return_text=that is the left vector defined by {{LSLP|q}}, i.e. a unit vector pointing in the local positive Y direction | ||
|func_footnote=Can be useful to identify the orientation of the local {{Wikipedia|sagittal plane|sagittal-plane}} of the prim, since it's y-axis is always perpendicular to this local sagittal-plane. | |func_footnote=Can be useful to identify the orientation of the local {{Wikipedia|sagittal plane|sagittal-plane}} of the prim, since it's y-axis is always perpendicular to this local sagittal-plane. | ||
|spec=Mathematically equivalent to: | |spec=Mathematically equivalent to: | ||
<lsl>ret = llVecNorm(<0., 1., 0.> * q);</lsl> | <lsl>ret = llVecNorm(<0., 1., 0.> * q);</lsl> | ||
If | If {{LSLP|q}} is known to be a unit quaternion then it can be simplified as: | ||
<lsl>ret = <0., 1., 0.> * q;</lsl> | <lsl>ret = <0., 1., 0.> * q;</lsl> | ||
|caveats | |caveats | ||
Revision as of 10:14, 29 June 2012
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Summary
Function: vector llRot2Left( rotation q );| 0.0 | Forced Delay |
| 10.0 | Energy |
Computes the orientation of the local y-axis relative to the earth.
Returns a vector that is the left vector defined by q, i.e. a unit vector pointing in the local positive Y direction
| • rotation | q |
Can be useful to identify the orientation of the local 
sagittal-plane of the prim, since it's y-axis is always perpendicular to this local sagittal-plane.
Specification
Mathematically equivalent to: <lsl>ret = llVecNorm(<0., 1., 0.> * q);</lsl> If q is known to be a unit quaternion then it can be simplified as: <lsl>ret = <0., 1., 0.> * q;</lsl>
Examples
See Also
Functions
| • | llRot2Up | |||
| • | llRot2Fwd | |||
| • | llRot2Axis | |||
| • | llRot2Angle |
Deep Notes
Signature |
|---|
function vector llRot2Left( rotation q ); |