Building for speed, part two

The first part of this two-part tutorial focused on creating a car model suitable for use in a next-generation game, using a mixture of polygonal and subdivision surface techniques. In the support files, additional objects such as windscreen wipers and the antenna have been added and the shut lines cut out and bevelled to complete the model ready for the second part of the tutorial.

This walkthrough explores the process of texturing, testing and exporting the car. First, to set up the scene for UV unwrapping, you will group all panels that will be on the same texture sheet and apply a chequered texture, so that the flow of the UVs can be seen more easily. Then you will UV unwrap all the panels and arrange the UVs onto these separate texture sheets. To add realism to a car paint shader, an Ambient Occlusion map will be created and edited in Photoshop. This map will then be used together with a Layered Texture in Maya to blend the Ambient Occlusion map with a colour, so that the colour of the vehicle could be changed without needing to create multiple colour textures. Following this you will create texture maps for front and rear lights, adding an alpha channel that will control the reflectivity. After the material set-up is complete, the car vehicle can be tested with an environment map so that you can see how the reflections on its surface might appear in the game.

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