World, screen and scaled spaces

[TaxiService]

Hi, we (RemoteTech team) are perplexed by a coordination-space issue (link). Our problem is basically that satellite connection lines in Map View (aka planetarium) sometimes invert in axis for no apparent reason. We tracked down to the offending codes in our RT codebase (link).

var start = camera.WorldToScreenPoint(ScaledSpace.LocalToScaledSpace(edge.A.Position));
var end = camera.WorldToScreenPoint(ScaledSpace.LocalToScaledSpace(edge.B.Position));
//the edge (A, B) is a connection between two satellites/ground stations
//Position is in the world space

We observed that the start and end vectors sometimes are suddenly shifted when a player's camera satisfies the conditions for shifting KSP's scaled space factor/offset, resulting in providing completely different vectors to RemoteTech codes. Given that we, the fresh blood for RT, are relatively new to the KSP mod scene, we seek the assistance of expert modders regarding KSP's world, screen and scaled spaces.

Our question is: How should we solve the problem, that may be linked to KSP's inner codes in LocalToScaledSpace()?

//Decompiled ScaledSpace class of KSP
public static Vector3d LocalToScaledSpace(Vector3d localSpacePoint)
{
  return localSpacePoint * (double)ScaledSpace.InverseScaleFactor - ScaledSpace.totalOffset;
}

 

Edited December 28, 2016 by TaxiService