Information processing system, method for determining lighting arrangement, and non-transitory computer readable medium

A non-transitory computer readable medium storing a program causing a computer to execute a process comprising:

• arranging a three-dimensional model in a virtual space;
• arranging a surface light source that illuminates the three-dimensional model in the virtual space;
• arranging a camera that captures the three-dimensional model in the virtual space;
• generating a two-dimensional map having a correspondence relationship with a surface of the three-dimensional model;
• capturing, from multiple viewpoints, a state where the three-dimensional model having a texture parameter for specular reflection set for the entire surface is illuminated by the surface light source and generating a multi-viewpoint specular reflection image;
• associating the multi-viewpoint specular reflection image with the two-dimensional map and generating a two-dimensional specular reflection map;
• and
• attaching the generated two-dimensional specular reflection map to the three-dimensional model and visualizing a specular reflection region.