An image processing device for realizing more realistic pictures of explosions
in video game devices and the like. Objects displaying such pictures of explosions
are formed of spherical polygons (R1, R2, R3, . . . ) and
planar polygons (S1, S2, S3, . . . ). Pictures of explosions
are realized by alternately arranging these spherical polygons and planar polygons
with the lapse in time. Preferably, pictures of polygons are realized by arranging
the spherical polygons in layers on the boundary of the planar polygons.