I created a model from imported dwg. drawing. I assigned custom materials (color only, made by changing RGB values) to some of the objects that are joined in components and a group. When turning on shadows (using sun for shading) only object that still have the default white material/colour applied to them cast shadows and the changed ones do not. I noticed that if I change opacity value of custom colors from 100 to 99 the shadows suddenly appear? I want the opacity set to 100 however. How do I fix this? See images below.
I’m using Sketchup Pro 2014.
EDIT: I noticed I made a mistake when stating that I got colors with changing RGB values. I did that first but then changed the colors again with Match color on screen tool from a pdf made in Illustrator.