This is to demonstrate some of the interesting challenges and issues with using Meshy in OpenSim (and SL). Many of my mesh pieces are AI images I then work with in Meshy. Not all of them come out crisp because they were not originally that way. But this is showing how to avoid pieces getting blurred or stretched if still allowing full perms.
Bring the mesh in larger than you are typically going to use it. However, don't get silly. I typically bring things in between 3 m and 5 m, unless it is going to be a life size building or some such. One thing people might do is to make the medium, low, and lowest triangle limits zero. That will cause mesh collapse when viewing from a distance.
Sharing an art horse I made and how this works. I brought the horse in at about 4 m. I sized it down for the store. The first image is about 2m x 2m.
This image is at 3.5 m x 3.5 m, still slightly smaller than the 4 m I brought it in at. You can see no discernable difference.
This image is at 6m x 6m , so now we are moving larger than the original mesh I brought in. There is still no discernable difference and you can see my avie down in the corner for proportion.
I just kept going - this is at 12m x 12m.
It makes a difference as well, regarding what sort of image you start with . In the piece below, the bees will retain sharpness as they are sized up. However, the pond was never sharp in resolution. It was derived from an image based on the work of Van Gogh, so it is an impressionistic pond. It will retain that resolution regardless of sizing up or down.