Step 4:Time for the nice reflecting clear coat. Actually it is rendered as a full reflecting mirror. Drag the Carpaint Mirror rendering into a new composition and use the Carpaint Mask rendering again as Luma Matte. We will use the Carpaint Falloff rendering later to blend it with the rest of the layers. An additional Brightness &Contrast can be used to modify the Falloff then.
Step 5:Specular metallic layer. Drag the Specular render layer (a simple noise map on the car body) into a new composition and use the Specular Falloff to knock out a nice alpha that will blend the metallic paint and will reveal the base coat underneath to gain the nice metallic specular paint effect. U can use a Brightness&Contrast and/or a Hue/Saturation to adjust or color the specular layer. I tinted it a little red e.g. :-)
Step 6:Details. I rendered the non carpaint details like lamps and tires into one single layer. That can be split up into more of cause. Drag the Detail rendering into a new composition and use the Detail mask to knock out the alpha. This masked was generated the same way the Carpaint Mask was done. Black and white Self-illuminated materials applied to objects. White to what you wanna keep, black what you wanna knock out.
Step 7:Glass. I rendered the glass as a full reflective mirror just like the clear coat and a fresnel falloff for the alpha so it behaves like real glass. Drag the Glass Mirror into a new composition and use the Glass Falloff as mask. I wanted to make the wind shield less transparent because the car doesn´t have any interior. I added a black solid color that covers only the wind shield underneath the glass and used the glass mirror as alpha mask to knock out the windows only.
Step 8: A simple Ground Shadow layer I rendered using a Matte/Shadow material on the ground to provide an alpha channel to the shadow. I set the whole car to “Cast Shadow” but to “Invisible to Camera” and “Invisible to Reflections” at the same time modifying the object properties (right click on a selected object). So the car casts a nice shadow with out being visible at all. Just drag that layer into a new composition. No masking this time. :-)