Patent ID: 7202874
Filing Date: 2007-04-10
Classification: G06T

Abstract:
1. An image drawing apparatus that draws an object existing in a virtual three-dimensional space by perspective-transformation onto a virtual screen from a viewpoint of a virtual camera, comprising: a rough model data storage that stores rough model data that forms the object by a predetermined number of polygons; a detailed model data storage that stores detailed model data that forms the object by more polygons than the predetermined number of polygons; a field divider that divides an image-drawing field, which is an image drawing range in the virtual three-dimensional space, into a first field and a second field with reference to a position of the viewpoint, the first field and the second field being divided at a boundary position; a first object determining section that determines whether at least a part of the object is included in the first field; a rough model drawer that draws an image obtained by perspective-transforming polygons of the rough model data of the part of the object included in the first field when at least a part of the object is included in the first field; a second object determining section that determines whether at least a part of the object is included in the second field; a detailed model determining section that determines whether each polygon of the detailed model data is included in the second field when at least a part of the object is included in the second field; and a detailed model drawer that draws an image obtained by perspective-transforming the polygons of the detailed model data of the part of the object included in the second field.