public VertexBuffer[] getGlobalUserInstanceData() {
        return globalInstanceData;
    }
Global user specified per-instance data.

By default set to <code>null</code>, specify an array of VertexBuffers
via {@link #setGlobalUserInstanceData(com.jme3.scene.VertexBuffer[]) }.

@return global user specified per-instance data.
@see #setGlobalUserInstanceData(com.jme3.scene.VertexBuffer[])
jme3-core/src/main/java/com/jme3/scene/instancing/InstancedGeometry.java