LMB+click the 'Add Clip' button and choose the 'New Image Folder' option. This is achieved by first creating a 'New Image Folder' in the 'Images' tab (typically found in the same viewport group as the 'Shader' viewport). Multiple UDIMs can be imported from an external painting app (such as MARI) or created from scratch in modo. Once the model is prepared with the UV map, its time to start texturing. When working in the 'UV Edit' interface layout it is easiest to simply enter whole number UV values to offset to a specific location, for example U 4.0 and V 3.0 for UDIM 1035, though it will be most economical to keep the tiles consecutively placed, but never spanning more than ten tiles in any horizontal row. Once the map is laid out as desired, it can be moved with the Transform tool ('W' key shortcut)to the desired UDIM tile. For information on MODO's UV mapping tools, please reference the UV mapping page of the documentation, or the UV tools reference page.įor individual parts it will likely be easiest to create and adjust the initial UV map for a given section in the UV 0-1 tile as many tools default to this locale. Higher resolution requirements might necessitate having hands and/or feet on separate tiles as well. For an average character project, the tiles *could* be broken up into the head in one tile, the front of the body on another and the back on another still. Decisions are made at this stage as to how the model will be divided, typically based on what degree of resolution is required for the project. Using a UDIM workflow begins with the UV mapping of the actual geometry. This illustration demonstrates a small section of the overall UDIM tile area as it relates to the UV space (the upper image corresponding to the lower left corner of this one). The numbering starts at the UV origin and moves in the positive direction outward ten tiles (to 1010) and then repeats the rows stacked on top of each other moving upward 9999 rows. The UDIM workflow is simply a notation format that names images accordingly so they are automatically assigned to a specific UV tile. Each image can have its own resolution as well.
With a UDIM workflow, each whole tile section, 0-1, 1-2, 2-3 and so on, can have its own independent image map assigned to it, all within the same surface. Because of this fact, traditionally only the UV 0-1 space was ever really used (well, outside of controlling how a surface tiled an image).
The UV map coordinate values are organized into a grid system where the image itself appears in the 0-1 area of the grid and the area outside of this tile simply repeats the image outward. Each vertex of the originating surface is given a coordinate on the UV map and the pixel values in-between are interpolated across the flat polygon surface for highly accurate texturing control (with the 'U' and 'V' axes names chosen specifically as to not cause confusion with the X,Y and Z axes for the actual model). UV mapping is the translation of a three-dimensional surface into the two-dimensional coordinate system of flat bitmap images (or vice-versa depending on how you look at it). In order to understand the benefits of the UDIM workflow, its best to have a basic understanding of how UV mapping works. At its core, UDIM is simply an automatic UV offset system that assigns an image onto a specific UV tile, that allows artists to use multiple lower resolution texture maps for neighboring surfaces, producing a higher resolution result without having to resort to using a single, ultra high-resolution image. For meshes that have more complex topology, use the UV Unwrap tool, which uses a more sophisticated algorithm to untangle the UVs.UDIM is a enhancement to the UV mapping and texturing workflow that makes UV map generation easier and assigning textures simpler. The Peeler tool works well on meshes that have uniform quadrangular polygons organized with adequate edge loop flow. At 100% the polygons all have the same size to make a regular UV grid. At 0% every polygon's size in UV space is proportional to its size in 3D space. Uniformity: Controls the size of the UV polygons in proportion to the size of the 3D space polygons. Normally, these values are 0, 0, 1, and 1. Min U, Max U, Min V, Max V: Define a box in UV space where Modo positions all the grids. You can use this tool for tedious, manual-style Atlas mapping or other cylindrical unwrapping tasks. You can control the region of UVs produced. The Peeler tool spreads UVs out perpendicular to the seam and tries to loop back to the cut from the other side. With it, you can cut a seam of edges in a well-behaved quad mesh. You use the Peeler tool for manually fixing UV maps.
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