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Rather than simulating individual leaves, I would just adjust the transmittance of a large shading surface to reflect the effective amount of sunlight passing through the vegetation. The model you are creating is going to be very slow with such complex shading calculations.

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No.2 Revision

Rather than simulating individual leaves, I would just adjust the transmittance of a large shading surface to reflect the effective amount of sunlight passing through the vegetation. The model you are creating is going to be take very slow long to simulate with such complex shading calculations.