Posted by ThomasR on Jan 28, 2019; 5:19pm
URL: https://forum.jogamp.org/Java3D-OpenGL-ES-tp4039401p4039436.html

For some reason, if yUp != true a copy was always made before rendering.  Perhaps that is no longer the case. In fact, byRef=true and yUp = true works so well, we have to be careful with the reference to the image data (you can see a change in the displayed image by changing the values of the backing byte array!)