Autodesk 12812-051462-9011 User Guide 3 - Page 515

also turned on automatically when you render the scene, or use Show Map In Viewport on page 5350. Some objects, such as editable meshes, don't have automatic mapping coordinates. For these types of objects, you can assign coordinates by applying a UVW Map modifier on page 1931. If you assign a map that uses a mapping channel, but don't apply a UVW Map modifier to the object, the renderer displays a warning that lists objects that require mapping coordinates. You can also use UVW Map to change an object's default mapping. See Mapping Coordinates on page 5279. UVW Mapping Coordinate Channels Each object can have from 1 to 99 UVWmapping coordinate channels. The default mapping (from the Generate Mapping Coordinates toggle) is always UVW 1. The UVW Map modifier can send coordinates to any of these channels. Each map in a material can use any UVW channel (if present), or other type of mapping that depends on whether the map is 2D or 3D. You can set the mapping channel used by NURBS surface on page 2275 sub-objects in their creation or modification parameters. Mapping for 2D Maps You can position a 2D map on the surface of an object by using a map channel, any assigned vertex color, or the local or world coordinate systems. You can also choose different environment mappings. See Coordinates Rollout (2D) on page 5782. Mapping for 3D Maps You can position a 3D map within the volume of an object by using a map channel, any assigned vertex color, or the local or world coordinate systems. See Coordinates Rollout (3D) on page 5861. Noise for Maps Random noise values increase the complexity of maps and can give them a more natural look. For 2D maps, see Noise Rollout (2D) on page 5793. For 3D maps, you can assign a separate Noise map. See Noise Map on page 5886. 5770 | Chapter 19 Material Editor, Materials, and Maps