// returns snapped world-frame, or input frame if no snap
public Frame3f UpdateSnapW(Frame3f fSourceFrameW, SnapSet Snaps)
{
FScene scene = targetSO.GetScene();
float fSnapRadiusW = VRUtil.GetVRRadiusForVisualAngle(fSourceFrameW.Origin,
scene.ActiveCamera.GetPosition(), SnapThreshVisualAngleDeg);
float fSnapRadiusS = fSnapRadiusW / scene.GetSceneScale();
// fSourceFrameW in Scene coordinates
Frame3f fSourceS = scene.ToSceneFrame(fSourceFrameW);
SnapResult best_snap = null;
float fNearest = float.MaxValue;
Frame3f fBestSourceL = Frame3f.Identity;
// snapframes are stored in local coords relative to object
foreach (Frame3f fPointFrameL in snapFramesL)
{
// convert local-coord snap frame into scene coords
Frame3f fPointFrameS = fSourceS.FromFrame(fPointFrameL);
SnapResult snap = Snaps.FindNearestSnapPointS(fPointFrameS, fSnapRadiusS);
if (snap != null)
{
float d = ((Vector3f)snap.FrameS.Origin - fPointFrameS.Origin).Length;
if (d < fNearest)
{
fNearest = d;
fBestSourceL = fPointFrameL;
best_snap = snap;
}
}
}
snapState.UpdateState(best_snap, fBestSourceL);
if (snapState.IsSnapped)
{
SnapResult useSnap = snapState.ActiveSnapTarget;
Frame3f useSourceL = (Frame3f)snapState.ActiveSnapData;
if (SnapOrientation)
{
// compute min-rotation frame, then align origins
Frame3f fAlignedSourceS =
Frame3f.SolveMinRotation(fSourceS, useSnap.FrameS);
Frame3f fPointFrameS = fAlignedSourceS.FromFrame(useSourceL);
Vector3f deltaS = (Vector3f)useSnap.FrameS.Origin - fPointFrameS.Origin;
snapFrameS = fAlignedSourceS.Translated(deltaS);
//// this is tricky...we have an object-space frame useSourceL, which
//// we want to snap to a scene-space frame usePoint.FrameS. So we need
//// to shift origin of that frame by -useSourceL_in_FrameS!
//snapFrameS = usePoint.FrameS.Translated(
// -usePoint.FrameS.FromFrameV(useSourceL.Origin));
}
else
{
// translation-only snap - find shift in scene space, apply to input source frame
Frame3f fPointFrameS = fSourceS.FromFrame(useSourceL);
Vector3f deltaS = (Vector3f)useSnap.FrameS.Origin - fPointFrameS.Origin;
snapFrameS = fSourceS.Translated(deltaS);
}
// now convert to world frame for return
return(scene.ToWorldFrame(snapFrameS));
}
return(fSourceFrameW);
}
