But if your object needed
to start out behind the trees, rise up above them, and then swoop down in front of them,
it wouldn??™t work. The foreground image would be pasted on top, no matter what.
Another, more common situation is that of having a 3D object cast shadows and otherwise
interact with your 2D images. Earlier in this chapter you put the Vase object on the
Foyer image and created a mask so that the planter appeared to be in front of the vase. It
now needs some shadows. This kind of seamless compositing is the mainstay of the visualeffects
industry.Without it, the movies and television shows you watch every day would
be tremendously different.
As you might have guessed, LightWave has the answer to compositing and casting shadows.
Shadows
Adding shadows to your 3D objects helps you move one step closer to creating a perfect
composite.
Exercise 16.5 Creating Shadows for Compositing
Front projection image mapping is unique in the way it maps the texture image, but in
every other way it??™s just a normal surface texture. It can receive shadows, reflect other
objects, and be transparent. By using these characteristics, you can make the objects
appear to interact with the scene.
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