Motion blur

Transformation blur

Motion blurred transformations are created by giving a sequence of transformations at different times. In most cases, two samples are enough to obtain a decent result. In the next example, the object is rotated by 20°.

Small motion blur
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Rendering for Beginners fig. 6.9

In case of extreme motion blur, more samples are required to avoid rendering artifacts as demonstrated in the next example. Here, the object is rotated by 120°1.

Motion blur with 2 samples
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Rendering for Beginners fig. 6.9
Motion blur with 3 samples
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Rendering for Beginners fig. 6.9
Motion blur with 6 samples
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Rendering for Beginners fig. 6.9

Just like usual static transformations, motion blurred transformations can be concatenated and nested hierarchically. In the next example, cubes are translated and rotated with varying speeds2.

Hierarchical motion blur
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This last example features lots of moving polygons with many different transformations3.

Animated Petunia
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Camera blur

Camera blur is not really different from transformation blur: instead of applying motion blurred transformations to objects, they are applied to the camera position. In the next examples, the camera tilts4 and pans5. The resulting image would not have been any different if the object was rotated.

Camera motion blur
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Rendering for Beginners fig. 6.11
Camera motion blur
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