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In order to set up the gradient, you have to open the Render Settings window, go to the Indirect Lighting (make sure Mental Ray is the current renderer) and click on Create on Image Based Lighting under the Environment rollout.
After that, change the Type to Texture and create a Ramp .The most important part is setting the V value for the white part of the gradient above 1 so that it has the strength to light the scene
As far as the spotlight goes, it is set far away from the car in order to get almost parallel rays (as it is with a directional light), with a low intensity and soft raytraced shadows.
Rendering - The rendering consists of just 2 passes: one for the car and the other one for the shadow on the floor, which is just a cylinder with a neutral gray material. For the car pass I just rendered everything, floor included, and then rendered out a mask of just the car by itself, so that I could later isolate it from the background.In order to get the mask, I just deleted the floor and assigned a Lambert to the car model with Incandescence set to white and rendered that out.
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