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17.4 Explosions

Explosion effects can be rendered by combining the techniques for smoke, vapor, and fire. A static image of a fireball is drawn centered in the middle of the explosion and dilated and faded over some time period. At the same time, the vapor and smoke rendering techniques are combined to cause a smoke trail to rise from the center of the explosion. To make the explosion appear more realistic, the geometry for fragments of objects are added to the scene with their own animated trajectories.