Texel density in Blender
texel density means how big the texture pixels will be in the scene. A pixel can correspond to 1mm2 etc. When creating models, it is usually optimal to keep the texel density the same throughout the model. This is something to keep an eye on when unwrapping the UV map. The exception may be models where you want to put more detail on a certain area of the model - for example, the face and hands on a character.
Blender has an excellent tool for checking texel density. You can create a new image and set the 'Generated Type' to 'UV Grid' or 'Color Grid' when you create it. You can use such an image in your material to view the quality of your UV map. If the individual squares of the grid are the same size, the Texel density on your model is also evenly distributed.
Check this youtube tutorial, and this tutorial comes also with an add-on to check texel density.
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