Katie: Colour transitions

To make the colour transformations in the houses we will render out the grey and coloured textures for each object by transferring the simple and coloured UVs as needed. I will use the matte render pass of each house and a ramp node to make a nice gradient transition between the two UV sets. I've done a test using a playblast and this method works well. It's not perfect but seeing as each house is only seen for a few seconds at a time it works for our project.