OpenSim
/
OpenSimMirror
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

Compute rotation for llLookAt() with local positive X axis pointing down

inv-download
dahlia 2015-02-02 02:47:47 -08:00
parent bee3933e57
commit 1eedc2b4af
1 changed files with 10 additions and 13 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

23
OpenSim/Region/ScriptEngine/Shared/Api/Implementation/LSL_Api.cs
View File

@ -3092,20 +3092,17 @@ namespace OpenSim.Region.ScriptEngine.Shared.Api
// Determine where we are looking from
LSL_Vector from = llGetPos();
// Work out the normalised vector from the source to the target
LSL_Vector delta = llVecNorm(target - from);
LSL_Vector angle = new LSL_Vector(0,0,0);
// normalized direction to target
LSL_Vector dir = llVecNorm(target - from);
// use vertical to help compute left azis
LSL_Vector up = new LSL_Vector(0.0, 0.0, 1.0);
// find normalized left axis parallel to horizon
LSL_Vector left = llVecNorm(LSL_Vector.Cross(up, dir));
// make up orthogonal to left and dir
up = LSL_Vector.Cross(dir, left);
// Calculate the yaw
// subtracting PI_BY_TWO is required to compensate for the odd SL co-ordinate system
angle.x = llAtan2(delta.z, delta.y) - ScriptBaseClass.PI_BY_TWO;
// Calculate pitch
angle.y = llAtan2(delta.x, llSqrt((delta.y * delta.y) + (delta.z * delta.z)));
// we need to convert from a vector describing
// the angles of rotation in radians into rotation value
LSL_Rotation rot = llEuler2Rot(angle);
// compute rotation based on orthogonal azes
LSL_Rotation rot = new LSL_Rotation(0.0, 0.707107, 0.0, 0.707107) * llAxes2Rot(dir, left, up);
// Per discussion with Melanie, for non-physical objects llLookAt appears to simply
// set the rotation of the object, copy that behavior