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This is a lens shader component that manipulates the shutter time distribution. This is commonly used with the Physical Lens Core node.
When Use shutter ramp is on, the ramp represents the weighting of a time sample based on it’s position in the shutter period. In terms of a camera, this ramp represents how much light gets through to the sensor (vertical axis) at a given moment across the the shutter time (horizontal axis). The default distribution is uniform.
The input shutter time.
The output shutter time, resampled from the Shutter Curve.