Difference between revisions of "LlRot2Up"
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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 z-axis|up-direction of prim}} relative to {{HoverLink|Viewer_coordinate_frames#Global|global coordinate system|the earth}}. | |func_desc=Computes the orientation of the {{HoverText|local z-axis|up-direction of prim}} relative to {{HoverLink|Viewer_coordinate_frames#Global|global coordinate system|the earth}}. | ||
|return_text=that is the up vector defined by | |return_text=that is the up vector defined by {{LSLP|q}}, i.e. a unit vector pointing in the positive Z direction | ||
|func_footnote=Can be useful to identify the orientation of the local horizontal-plane of the prim, since it's z-axis is always perpendicular to this local horizontal plane. | |func_footnote=Can be useful to identify the orientation of the local horizontal-plane of the prim, since it's z-axis is always perpendicular to this local horizontal plane. | ||
|spec=Mathematically equivalent to: | |spec=Mathematically equivalent to: | ||
<lsl>ret = llVecNorm(<0., 0., 1.> * q);</lsl> | <lsl>ret = llVecNorm(<0., 0., 1.> * q);</lsl> | ||
If | If {{LSLP|q}} is known to be a unit quaternion then it can be simplified as: | ||
<lsl>ret = <0., 0., 1.> * q;</lsl> | <lsl>ret = <0., 0., 1.> * q;</lsl> | ||
|caveats | |caveats | ||
Revision as of 11:15, 29 June 2012
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Summary
Function: vector llRot2Up( rotation q );| 20 | Function ID |
| 0.0 | Forced Delay |
| 10.0 | Energy |
Computes the orientation of the local z-axis relative to the earth.
Returns a vector that is the up vector defined by q, i.e. a unit vector pointing in the positive Z direction
| • rotation | q |
Can be useful to identify the orientation of the local horizontal-plane of the prim, since it's z-axis is always perpendicular to this local horizontal plane.
Specification
Mathematically equivalent to: <lsl>ret = llVecNorm(<0., 0., 1.> * q);</lsl> If q is known to be a unit quaternion then it can be simplified as: <lsl>ret = <0., 0., 1.> * q;</lsl>
Caveats
Examples
See Also
Functions
| • | llRot2Left | |||
| • | llRot2Fwd | |||
| • | llRot2Axis | |||
| • | llRot2Angle |