Assign a mapped material to an object that has no mapping coordinates.
Change Map Channel to a value other than 1.
Command entry: Quick Access toolbar
Click the Open button.
Open a MAX scene.
One or more maps in the MAX file cant be found.
The Missing Map Coordinates dialog is displayed when you attempt to render one or more objects with materials whose maps use
a map channel other than channel 1. (Channel 1 is an exception because channel 1 mapping coordinates are automatically turned on when you
assign a mapped material to an object.) Only maps with Show Map In Viewport toggled on are listed as missing.
To use other map channels, you must assign a UVW Map modifier to the object. In UVW Map, set Map Channel to match the value used in the material.
If the material has multiple maps that use multiple channels, you must assign a separate UVW Map modifier for each channel
besides channel 1.
If the object is a NURBS surface sub-object, you don't need to use UVW Map. Instead, set the map channel on the surface sub-object's Material Properties rollout.
The Missing Map Coordinates dialog is also displayed when you open a MAX file that references bitmaps that can’t be found
in their original location, or are at a location not specified via the Configure User Paths dialog. To open the MAX file, click the Browse button on the Missing Map Coordinates dialog. This opens the Configure User Paths
dialog so you can assign one or more paths for the MAX file to access. These settings are then stored with the MAX file.
The list shows the map channel followed by the name of the object.
Proceeds with the rendering. The objects listed will not show maps in the material assigned to them, and might not be visible