Real-world mapping is an alternative mapping paradigm in 3ds Max that is off by default. The idea behind real-world mapping is to simplify the correct scaling of texture-mapped materials applied to geometry in the scene. This feature lets you create a material and specify the actual width and height of a 2D texture map in the Material Editor. When you assign that material to an object in the scene, the texture map appears in the scene with correct scaling.
For real-world mapping to work, two requirements must be met. First, the correct style of UV texture coordinates must be assigned to the geometry. Essentially, the size of the UV space needs to correspond to the size of the geometry. To this end, a new option called Real-World Map Size has been added to many of the dialogs and rollouts that let you generate texture coordinates (see list at the end of this topic). Any dialog or rollout that lets you turn on Generate Mapping Coords also lets you enable Real-World Map Size. Also, you can toggle this option globally on the Preferences dialog .
Most object parameters settings now include a Real-World Map Size toggle.
The second requirement is available in the Material Editor. All 2D texture maps, such as Bitmap, provide a Use Real-World Scale check box on the . Like Real-World Map Size, this check box is off by default; when on, the U/V parameter names change to Width/Height and the Tiling label changes to Size. You can then specify the horizontal/vertical offsets and size of the texture map in current .
2D map coordinates settings now include a Use Real-World Scale toggle.