Posted by Wade Walker on Mar 05, 2016; 7:14pm
URL: https://forum.jogamp.org/GLCLInteroperabilityDemo-and-float4-tp4036419p4036436.html

It could be that if you're not using 4-component vertices, then when they're multiplied by the transform matrix, they don't pick up the translation, so the object may be getting drawn behind the camera. You'd see an empty screen in that case :)