A Method for Rendering the Ground at the Beginning of the Rain

Abstract

We propose a method for representing transition of appearance of the ground due to rain. Our method particularly focuses on the beginning of the rain, that is, the appearance of the ground changes from dry to wet. We treat the number of rain drops fallen on the unit area with "moisture map", then we change the color of the fragment of the ground by using the map. To reduce the memory for the "moisture map", the map consists of multiple layers with multiple resolution and we developed a technique to assign the appropriate resolution synchronizing to that of visible surface.