How to import custom mip maps?

Development Rendering
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You can import custom mip maps using DDS. for 2D textures only ARGB8888 will work. In Photoshop using Nvidia plugin: File, save, select 8.8.8.8 ARGB 32bpp | unsigned.

Trick if you want to draw something different on each mipmap:

  1. save your file as dds
  2. load back the DDS in Photoshop : File, Open, On the popup windows don’t forget to check load MIP maps
  3. you will then have a single image with all MIPs that can be edited in Photoshop.
  4. save as .DDS ARGB8888, check use existing MIP maps:All
  5. import in Unreal import your image using level of detail/mip map gen settings: LeaveExistingMips