THANKS David! ...I did have very good success using the "Adjust Material Definition" function, which I had not noticed. Then I went to Texture->Material Color->set Blend with Texture, and picked 255 255 255 white and it worked. For MOST exterior walls. For a few they remain gray. Trying to figure out if it is lighting or sun angle or shade but I don't think so. But, I'm on my way! THANKS...Tom