What is the "color filter" mentioned in the rules?

He’s used for vision sensors?
I can’t find the relevant documentation information. Can someone guide me?

You can use color filters with the light sensor, an old thread where I did some analysis here.

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Is it necessary for vision sensor to use this?

You are not allowed to use this with the Vision Sensor.

The Vision Sensor captures full color anyway, so a color filter would be pointless.

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