| 摘要 |
PURPOSE:To effectively find the interior illuminance based upon sky light and ground reflected light with high precision even when a visible light transmissive wall surface and an irradiated point are in complicated geometrical arrangement by approximating a three-dimensional angle projection rate with high precision by using meshes. CONSTITUTION:Mesh division is performed according to a surface model by CAD. When the illuminance is only calculated, only the visible light transmissive wall surface is divided into meshes, but when a light and shade display in a room is made by computer graphics, on the other hand, all wall surfaces constituting an analytic space are divided into meshes. Diffused light entering the room through the visible light transmissive wall is the sum of diffused light beams entering the room through respective meshes belonging to the visible light transmissive wall surface. The illuminance is the same. The rate of three- dimensional angle projection on the meshes belonging to the visible light transmissive wall from the irradiated point is approximated with the rate of three- dimensional angle projection on a circle which has the same area with the meshes and centers on the center of gravity of the meshes. |
