LlAxes2Rot

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Contents

Summary

Function: rotation llAxes2Rot( vector fwd, vector left, vector up );
17 Function ID
0.0 Delay
10.0 Energy

Returns a rotation that is defined by the 3 coordinate axes

• vector fwd
• vector left
• vector up

All three vectors must be mutually orthogonal unit vectors.

Examples

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) );
    }
}

This script displays: 

  Object: <-0.00000, 0.00000, 90.00000>
which shows that (j, -i, k) is obtained by rotating (i, j, k) 90 degrees around z direction.

Notes

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

llAxes2Rot(fwd, left, fwd % left);
llAxes2Rot(left % up, left, up);
llAxes2Rot(fwd, up % fwd, up);

Deep Notes

Issues

Search JIRA for related Issues

Tests

•  Visual illustration – Importance of mutually orthogonal unit vectors
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