jGL matrix inversion get full of NaN values on XZ or YZ projections

[jzy3d]

Symptom

The impact for EmulGL (only) is that - without hack - the 2D to 3D projection provides Coord3D(0,0,0), leading to invisible tick and axis labels placed on the upper left corner for XZ and YZ projection only.

This is not the case for XY projection, and this never happens with Native charts.

Origin

When Camera.screenToModel is called by TextRenderer.to3D, The GLU.inverseMatrix44 method returns matrices full of NaN values.

A solution could be to provide a new implementation of inverseMatrix44, without confidence that it would be as efficient as this one. NB : the code comments let us think that this implementation is the second attempt.

Workaround

In order to get a quick (and dirty) fix, we simply let the view shift a little bit the viewpoint (only in the case of EmulGL) to ensure we do not fall in the case.

This is sometime not even visible, e.g. fix for XZ

This is sometime visible a bit, e.g. fix for YZ

Reproduce

See this integration test and run the test as a program rather than a unit test

public class ITTest_2D_Colorbar extends ITTest {
  public static void main(String[] args) {
    open(new ITTest_2D_Colorbar().when2DChartWithColorbarAndMargins(WT.EmulGL_AWT, HiDPI.ON, View2D.YZ));
  }
}