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If disabled, all grass-related shadows are removed, which can improve performance.
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Grass Shadow: If enabled, the grass in outdoor areas will have shadows of varying intensity. If you wish to turn off the Sun as a dynamic light source, disable this option, and your FPS will improve noticeably. While this greatly enhances the realism and atmosphere of the game, it can also greatly reduce performance. Sun Shadow: When enabled, the Sun is a dynamic light source (depending on your Renderer chosen), and as such all objects can cast shadows from their exposure to the sun.
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