On specular reflection and diffuse reflection

Because specular reflection reflects most of the light in the same direction, if you just stand in that direction, because the light is brighter than diffuse reflection. If you are not standing in that direction, it is brighter than diffuse reflection, because diffuse reflection reflects light in different directions.

For example, on a moonlit night, it rained. If the moon is in front of the road you want to go, in order not to step on the puddle, because the moonlight is reflected on the water, the puddle will be very bright in the direction of the reflected light, so you can't go to the bright place; If the moon is behind you, go to a bright place.

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