Methods and apparatus for shading object drawings in video games

A computer-readable storage medium storing a program for a video game, which draws an object comprised of a plurality of polygons,

• wherein said program is structured so as to make a computer perform:
• generating a dummy object of said object;
• setting a distance from a view point of each polygon forming said dummy object and said object so that said dummy object thus generated is positioned behind said object and overlaps only in part with said object when observed from the view point;
• and
• drawing each polygon forming said object and each polygon forming said dummy object in a lightness different from that of a corresponding polygon of said object, in accordance with a drawing order of said polygons resulting from sequencing of said polygons from the greatest distance from the view point, set in said setting.

A computer-readable storage medium storing a program for a video game, which draws an object comprised of a plurality of polygons,

• wherein said program is structured so as to make a computer perform:
• generating a dummy object of said object;
• setting a distance from a view point of each polygon forming said dummy object and said object so that said dummy object thus generated is positioned behind said object and overlaps only in part with said object when observed from the view point;
• and
• drawing a pixel according to a polygon having a distance closest to the view point, set in said setting, out of polygons projectable into said pixel, wherein when the polygon projected into the pixel is a polygon forming said object, said pixel is drawn according to said polygon and wherein when the polygon projected into the pixel is a polygon forming said dummy object, said pixel is drawn in a lightness different from that of the corresponding polygon of said object.

An object drawing method in a video game, which draws an object in a virtual space, said object drawing method comprising:

• generating a dummy object of said object;
• determining positions of said object and said dummy object so that said dummy object thus generated is positioned behind said object and overlaps only in part with said object when observed from a view point;
• and
• drawing said object at said position thus determined and drawing said dummy object at said determined position except for an overlapping portion between said object and said dummy object when observed from the view point and in a lightness different from that of said object.

An object drawing method in a video game, which draws an object comprised of a plurality of polygons, said object drawing method comprising:

• generating a dummy object of said object;
• setting a distance from a view point of each polygon forming said dummy object and said object so that said dummy object thus generated is positioned behind said object and overlaps only in part with said object when observed from the view point;
• and
• drawing each polygon forming said object and each polygon forming said dummy object in a lightness different from that of a corresponding polygon of said object, in accordance with a drawing order of said polygons resulting from sequencing of said polygons from the greatest distance from the view point, set in said setting.

An object drawing method in a video game, which draws an object comprised of a plurality of polygons, said object drawing method comprising:

• generating a dummy object of said object;
• setting a distance from a view point of each polygon forming said dummy object and said object so that said dummy object thus generated is positioned behind said object and overlaps only in part with said object when observed from the view point;
• and
• drawing a pixel according to a polygon having a distance closest to the view point, set in said setting, out of polygons projectable into said pixel, wherein when the polygon projected into the pixel is a polygon forming said object, said pixel is drawn according to said polygon and wherein when the polygon projected into the pixel is a polygon forming said dummy object, said pixel is drawn in a lightness different from that of the corresponding polygon of said object.

A video game apparatus, which comprises

• a computer-readable storage medium storing a program for a video game which draws an object in a virtual space;
• and
• a computer which reads out at least one part of said program from said recording medium to perform, by reading out at least one of said program from said storage medium,
• generating a dummy object of said object;
• determining positions of said object and said dummy object so that said dummy object thus generated in said generation is positioned behind said object and overlaps only in part with said object when observed from a view point;
• and
• drawing said object at said position thus determined in said determination and drawing said dummy object at said position determined in said determination except for an overlapping portion between said object and said dummy object when observed from the view point and in a lightness different from that of said object.

A video game apparatus, which comprises

• a computer-readable storage medium storing a program for a video game which draws an object comprised of a plurality of polygons in a virtual space;
• and
• a computer which reads out at least one part of said program from said recording medium to perform, by reading out at least one of said program from said storage medium,
• generating a dummy object of said object;
• setting a distance from a view point of each polygon forming said dummy object and said object so that said dummy object thus generated in said generation is positioned behind said object and overlaps only in part with said object when observed from the view point;
• and
• drawing each polygon forming said object and each polygon forming said dummy object in a lightness different from that of a corresponding polygon of said object, in accordance with a drawing order of said polygons resulting from sequencing of said polygons from the greatest distance from the view point, set in said setting.

A video game apparatus, which comprises

• a computer-readable storage medium storing a program for a video game which draws an object comprised of a plurality of polygons in a virtual space;
• and
• a computer which reads out at least one part of said program from said recording medium to perform, by reading out at least one of said program from said storage medium,
• generating a dummy object of said object;
• setting a distance from a view point of each polygon forming said dummy object and said object so that said dummy object thus generated in said generation is positioned behind said object and overlaps only in part with said object when observed from the view point;
• and
• drawing a pixel according to a polygon having a distance closest to the view point, set in said setting, out of polygons projectable into said pixel, wherein when the polygon projected into the pixel is a polygon forming said object, said pixel is drawn according to said polygon and wherein when the polygon projected into the pixel is a polygon forming said dummy object, said pixel is drawn in a lightness different from that of the corresponding polygon of said object.

A video game apparatus which draws an object in a virtual space, said apparatus comprising:

• a computer;
• and
• a computer-readable storage medium storing a program to be executed by said computer,
• wherein said program is structured so as to make said computer perform:
• generating a dummy object of said object;
• determining positions of said object and said dummy object so that said dummy object thus generated in said generation is positioned behind said object and overlaps only in part with said object when observed from a view point;
• and
• drawing said object at said position thus determined in said position determining process and drawing said dummy object at said position determined in said determination except for an overlapping portion between said object and said dummy object when observed from the view point and in a lightness different from that of said object.

A computer program for a video game, which draws an object in a virtual space,

• wherein said computer program is structured so as to make a computer perform:
• generating a dummy object of said object;
• determining positions of said object and said dummy object so that said dummy object thus generated is positioned behind said object and overlaps only in part with said object when observed from a view point;
• and
• drawing said object at said position thus determined and drawing said dummy object at said determined position except for an overlapping portion between said object and said dummy object when observed from the view point and in a lightness different from that of said object.

A computer program for a video game, which draws an object comprised of a plurality of polygons,

• wherein said computer program is structured so as to make a computer perform:
• generating a dummy object of said object;
• setting a distance from a view point of each polygon forming said dummy object and said object so that said dummy object thus generated is positioned behind said object and overlaps only in part with said object when observed from the view point;
• and
• drawing each polygon forming said object and each polygon forming said dummy object in a lightness different from that of a corresponding polygon of said object, in accordance with a drawing order of said polygons resulting from sequencing of said polygons from the greatest distance from the view point, set in said setting.

A computer program for a video game, which draws an object comprised of a plurality of polygons,

• wherein said computer program is structured so as to make a computer perform:
• generating a dummy object of said object;
• setting a distance from a view point of each polygon forming said dummy object and said object so that said dummy object thus generated is positioned behind said object and overlaps only in part with said object when observed from the view point;
• and
• drawing a pixel according to a polygon having a distance closest to the view point, set in said setting, out of polygons projectable into said pixel, wherein when the polygon projected into the pixel is a polygon forming said object, said pixel is drawn according to said polygon and wherein when the polygon projected into the pixel is a polygon forming said dummy object, said pixel is drawn in a lightness different from that of the corresponding polygon of said object.