Gets and sets the roughness of the ground which controls the sharpness of the reflection. This is only used when the isGroundReflections property is true. This is a value between 0 and 1, where 0 is smooth and 1 is rough.
"sceneSettings_var" is a variable referencing a SceneSettings object.
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"sceneSettings_var" is a variable referencing a SceneSettings object.
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