What does using a pre-calculated light mode in Unity save compared to real-time?

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Using a pre-calculated light mode in Unity significantly saves performance resources compared to real-time lighting. This is because pre-calculated lighting involves baking lighting information into textures or lightmaps ahead of time, which reduces the computational load required during gameplay. Real-time lighting, on the other hand, constantly calculates lighting effects based on the scene's geometry and light sources, which can be resource-intensive and may lower frame rates, especially in complex scenes with many dynamic objects.

By opting for pre-calculated lighting, developers can ensure that the game runs more smoothly on a wider range of hardware, as the graphical fidelity perceived by the player is maintained without the heavy resource demand of dynamic lighting calculations. This is especially useful in scenarios where performance is critical, such as in mobile games or virtual reality applications, where maintaining optimum frame rates is essential for a good user experience.

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