How to fillet and smooth sharp edges?

In real world, we don’t have absolute sharp edge. Even the sharpest edges have little amount of smoothness. I want to create a realistic window model and take it to 3DS MAX for rendering.
When I use plugin for smoothing edges and import it in 3ds max, the smoothness isn’t good at all.
it’s polygones is seen one by one.
What is the solution?

Share your model so we can see what you’ve done exactly and offer some alternatives.

The FredoCorner plugin can create the fillets you probably mean. Note that for a model viewed from more than a few centimeters distance filleting “sandpaper edges” is a total waste of time and computer resources, as they will not render any different than sharp edges while they multiply the amount of geometry your system has to process.