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how to apply light to big ground

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there are some  light(dynamic or static) in the scene,   and assume the scene only has a big ground with many(>1000) small grid.

how to apply light to each small grid ?


here's the code:

foreach(grid  in ground) 
    shader.updateUniform( lights near the grid);           //




Is it right?  lights near each grid are different,  every time I should update the light list in shader,  is it too slowly?

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