First off a general thank you to the generosity of this forum. I have learned a lot!
I have to render a building that will have a glass block facade. I played around with using a tiles map and wondering if anyone had suggestions to make it better. Also curious if there is a way to control the grout color. The file is in max 9 format.
Try a subtle noise type bump over the glass to break it up a bit, and you can handle the grout using a VrayBlend material, with an alpha to mask out the grout lines used to blend a grout material over your glass material.
I’ve just modeled the blocks themselves and arrayed them into the wall. Tends to always be a small enough area covered (or enough of a feature) that it’s a viable solution.