Hi!

I’m looking to understand  in a more advanced way how QGIS handles on-the-fly 
projection.
In my case I set the project crs in epsg:3857 and I have a raster layer in 
epsg:4326. In this case what is happening with the layer?

I know that it’s based on PROJ, but I’m wondering what is actually happening in 
the back-end, what is happening in the map canvas, how is the layer render, is 
being resampled every time you pan the map or do zoom in/out ...

So, if someone can help with a detailed explanation, I would really appreciate 
it.

Thanks in advance!

All the best!
Ionut
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