UDIMи – UDIMs

Using UV maps can have one disadvantage, they consist of one texture for the entire mesh. Most of the time this is sufficient but the disadvantage is that the texture is one resolution for the entire mesh. This causes issues if you have a very large mesh with geometry of different importance. When using a singular texture, the resolution might be too low to cover larger UV islands while being inefficient for smaller, less important islands.

UDIM offers a solution to this by being able to spread UV islands across several different textures. UDIM which stands for U DIMension is based on a tile system where each tile is a different texture in the overall UDIM texture array. Basically each tile consists of its own UV space (0-1, 1-2, 2-3) and have its own image assigned to that tile. Tiles are managed in the UDIM Tiles panel where they can have a generated image assigned to them. Generally, you create several textures of different resolutions; for example, you may have a 4k resolution texture for the major details, and 2k and/or 1k textures for less important details.

The UDIM array consists of one main tile, this tile is given the index number of 1001. The next tile that gets added will be 1002 and will be placed to the right of the main tile. The overall UDIM array is ten tiles wide, so tiles 1001 through 1010 are created on the first row. After ten tiles a new row of tiles is started above the main tile; so 1011 will be place directly above 1001.

Workflow – Робпотік

To start using a UDIM workflow, you should unwrap a mesh as you would for any other UV map. After that you should decide how many textures you want to split your UV map into. This will be different for every mesh and workflow but a good minimum is 3: one 4k, one 2k, and one 1k image. Then create the desired textures to match how many textures you want.

After this it is the same process of moving UVs to the appropriate tile and scaling and managing them like any other UV map. See Робпотік щодо Розстави UV – Layout Workflow for information on laying out UVs.

When the UVs are correctly set up across the multiple UV islands it is time to add proper textures the UDIM array. Currently, existing textures cannot be added to a tile, to fill a tile with an existing texture you first must:

  1. Створили бажані плитки.

  2. Зберегти зображення.

  3. Replace the saved image file with the desire texture by deleting the file and replacing it with a new image file, keeping the old file name. Or by opening the image in another application and modifying the contents of the image.

Other than using a third-party application to edit the UDIM texture it is possible to paint on UDIM textures. This works for either 2D Painting or 3D Painting.

File Substitution Tokens

Substitution tokens are special sequences of characters in a filename that can be replaced with more meaningful and context aware information. In this case, tokens are identified by being text wrapped in angle bracket characters.

This substitution is used while load loading or saving an image to automatically identify the tile associated with a particular texture in the UDIM array.

The following tokens are supported:

  • <UDIM>: A 4-digit notation calculated as 1001 + u-tile + v-tile * 10.

  • <UVTILE>: A notation defined as u(u-tile + 1)_v(v-tile + 1).

Приклади:

  • monster-basecolor.<UDIM>.png will load/save files like monster-basecolor.1021.png etc.

  • monster-basecolor.<UVTILE>.png will load/save files like monster-basecolor.u1_v3.png etc.

Плитки UDIM – UDIM Tiles

Reference – Довідка

Editor – Редактор:

Редактор Зображень, Редактор UV – Image Editor, UV Editor

Mode – Режим:

All Modes – Усі Режими

Panel – Панель:

«Бічносмуга > Зображення > Плитки UDIM» – Sidebar ‣ Image ‣ UDIM Tiles

У цій панелі плитки UDIM управляються; нові плитки можуть бути додані, плитки можуть бути вилучені або плитки можуть бути заповнені генерованою текстурою.

Список Плиток UDIM – UDIM Tile List

List all UDIM tiles associated with the main index (1000 tile). Double clicking on the tile name allows you to alter the tiles Label.

Додати Плитку – Add Tile +

Додає нові плитки UDIM у групу.

Номер – Number

The starting tile index number. UDIMs must start with the 1001 tile and typically increase in incremental order.

Count – Рахунок

Кількість плиток для додання.

Ярлик – Label

An optional label can be used instead of the index number. These labels are shown in the 2D Viewport.

Fill – Заповнення

Займається плитка UDIM генерованим зображенням; дивіться Fill Tile нижче.

Вилучити Плитку – Remove Tile -

Deletes the selected UDIM tile from the group. If this tile is not saved and contains data, that data will be lost.

Заповнити Плитку – Fill Tile

Займається плитка UDIM генерованим зображенням – Generated Image.

Попередження

Якщо плитка не заповнена, то вона не буде збережена із зображенням.