I have created the following image, by heading to 'Windows > 3D > Extrusion > Create' within Photoshop:
I would now like to reduce its Extrusion Depth, using Millimeters as the unit of measurement. At present, the Extrusion Depth is set at 224 as per the below screenshot:
I can only assume this is a Pixel Measurement. Is this the case and if so, is there a way to change its Unit of Measurement?