| 摘要 |
PROBLEM TO BE SOLVED: To represent the effect of a fog for part of scenery and to represent the effect of a fog in consideration of the case wherein more than one fog is put spatially one over another by generating the color of a pixel by mixing the color of a figure and color information with the value of a density function determined by a viewpoint and a point on the figure. SOLUTION: The area of a fog is found from the distance from the center of the fog by placing the center of the fog in a three-dimensional space. For example, the fog area is determined at 5-meter from the center point and the density of the fog is decreased with the distance from the center point to represent a spherical spread of the fog from the center point. There is figures of an airship, a house, and a ground surface in the three-dimensional space and figures present in a vertical space from the viewpoint to the projection surface are projected on the projection surface to display the three-dimensional figures on the two-dimensional screen. For example, a cloud is regarded as the area of a fog and the fog area is placed in the three-dimensional space to fog the airship present in the cloud. |
