Glare index 0 in the results for south perimeter

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Hello, I am developing shading control logic to optimize cooling and lighting load while mitigating glare index.

My model is based on thermal zoning (core and east, south, north, west perimeters).

I found that illuminance on the south perimeter is more stable than in other perimeters, but the magnitude remains the same across all perimeters.

Even though this, the glare index in the south perimeter is always zero.

Howe could I solve this problem?