Image processing device, control method for image processing device

Abstract

The present invention provides an image processing device capable of attaining shade expression on a surface of an object while reducing image processing load, and of reducing a sense of discomfort which the user may feel. A shading process execution unit (62) executes a shading process on the surface of the object, based on a pseudo-normal vector for each pixel of a texture image to be mapped onto the surface of the object. A shading process execution restraining unit (66) restrains execution of the shading process by the shading process execution unit (62), based on the distance from a viewpoint to the object. A pseudo-normal vector obtaining unit (60) stores information correlating the distance from the viewpoint with pseudo-normal vector information for obtaining a pseudo-normal vector of each pixel. Then, the pseudo-normal vector obtaining unit (60) obtains a pseudo-normal vector of each pixel, based on the pseudo-normal vector information correlated to the distance from the viewpoint to the object.

Description

technical field [0001] The invention relates to an image processing device, a control method of the image processing device and an information storage medium. Background technique [0002] In three-dimensional image processing, it displays and outputs what is seen in a virtual three-dimensional space in which objects are placed from a given viewpoint. At this time, there is bump mapping as a technique for expressing unevenness on the surface of an object. With the bump map, by correcting the normal vector of the object surface in accordance with the bumps, shadows (light and shade) corresponding to the bumps can be formed on the object surface. That is, with the bump map, even if the bumps of the object surface are not strictly represented by polygons, shadows (light and shade) corresponding to the bumps can be applied to the target surface. [0003] In a general bump map, a normal vector (hereinafter referred to as "pseudo normal vector") is virtually set for each pixel ...

AI Technical Summary

Problems solved by technology

However, at this time, when changing from the state of performing bump mapping on the object to the state of not performing bump mapping on the object, because in the game screen, the shadow corresponding to the bump is finely expressed on the surface of the object, and the state corresponding to the bump is changed. The shadow is not finely expressed on the surface of the object, so it sometimes makes the user feel a little weird

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