public IList<VoxelVolume> GetVolumes()

//At 2.x - var volume = voxelLayer.GetVolumeSize();
//var x_max = volume.Item1;
//var y_max = volume.Item2;
//var z_max = volume.Item3;

var x_max = voxelLayer.GetVolumes().Max(v => v.GetVolumeSize().X);
var y_max = voxelLayer.GetVolumes().Max(v => v.GetVolumeSize().Y);
var z_max = voxelLayer.GetVolumes().Max(v => v.GetVolumeSize().Z);

//Get the dimensions of just one volume
var dimensions = voxelLayer.GetVolumes().FirstOrDefault();
//Get the dimensions of the volume associated with the selected variable
var dimensions2 = voxelLayer.SelectedVariableProfile.Volume.GetVolumeSize();