I am trying to make an animation of an image textured mesh fade to transparent and then another mesh (with an image applied to it) fade into view. I know how to make meshes with materials turn transparent, but have been trying all sorts of settings to fade my uv texture and it only results in a messy looking render if it does anything. Any tips to set me in right direction would be appreciated 
Thank you test-dr. Your example helped. It wasn’t exactly what I was looking for, as it did a swipe, and I wanted an even blend. But I did use your technique and the blend texture to get what I was wanting to do. I ended up using the Spherical progression instead of Linear, and adjusted the brightness under Colors But now that I have that sorted, I’m also downloading 3Delight to check out. Thanks for the responses!