with Texel Density Checker you can:
Calculate Texel Density for model for different texture size (512px - 4096px) or with custom size and aspect ratio
Rescale UV for getting texel density what you want
Use Interactive Checker Material
Copy TD from Active to Selected objects
UPDATE 2.0 (02.10.19) Realese Notes:
[New] Interactive Checker Material - Assigment Material with checker texture. Texture dynamically changes if you change “Texture Size” on Texel Density UI Panel. This feature have two modes:
Replace - Just delete all materials from selected objects and assign Checker Material.
Store and Replace - Save current materials assignment for each selected object (near blend-file will be created DB-file), to objects add checker material and assign to all objects. After this if you press “Restore Materials” button, all saved materials will be restored.
[New] Texel Density UI Panel in UV Editor Window - Now you can directly operate with faces in UV Editor without Sync Selection Mode.
[New] TD Checker works with MultiEdit (both modes - 3D View and UV Editor)
[Fix] Error if Custom Texture size equals 0 or negative
[Fix] Error if Calculated Value is very small
[Fix] “TD from Active to Others” change UV on Active Object
[Improvement] UI is more flexability
[Improvement] “Selected Faces” option is true by default
[Improvement] Change Texture Size or Units value calls recalculate TD
[Improvement] Refactoring of Code
I hope this addon will be very useful for somebody!