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***: Atten<sub>i</sub> - attenuation of light i
***:: d<sub>i</sub> - distance from light i
***::: d<sub>i</sub> = |L<sub>dir<sub>i</sub></sub>|
***:: a<sub>0</sub> - constant attenuation factor
***:: a<sub>1</sub> - linear attenuation factor