I'm not sure if this is in the right section, but if it isn't, can a moderator move it to the correct place.

Okay so I have a problem when I go to render my house model. Instead of trying to explain, I will show what happens.

The first one is a print screen of the model, the second picture is a render using V-Ray.

So you can see when I go to render, the colour of the materials revert back to the orginal colour. I changed the colour of the materials in sketchup to achieve what I wanted.

How do I overcome this? I'm fairly new to V-Ray and rendering, and this was my second model attempt.

Thanks guys