Illuminance Calculation Using Monte Carlo Method

概要

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The Monte Carlo method, which has recently been widely used to predict the illuminance distribution of a room arranged in a complicated way with furniture, is easier than others in terms of algorithm and is suited to simulating the various states of lighting in a room. The accuracy of the illuminance distribution is affected by the number of particles that replace the luminous flux of the light source and the number of elements on the room surfaces. Therefore, we investigated the suitable number of the particles and elements considering the CPU time and error rate of the illuminance calculation when a shadow caster assumed to be a worker's head was set up at an arbitrary position in a rectangular parallelepiped model room. A new method, which uses the incident particles on the surrounding elements of the calculation point, was developed to decrease the CPU time and calculation error. We examined various reflectances of the room surfaces, positions and diameters of the shadow caster, and sizes of the shadow caster and light source. As a result, using only 1/10 the CPU time of previous methods, we found that the suitable number of particles is five million and the suitable number of the elements on the floor is 40×40 to 60×60.
社団法人照明学会の論文