US 7,116,334 B2Granted

Game system and image creating method

AssigneeNamco Bandai Games Inc.

InventorShigeru Kitsutaka

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Abstract

An objective of the present invention is to provide a game system, program and image generating method which can generate a more realistic image with reduced processing load by using an alpha value set depending on a depth value. Z-value for each pixel in an original image is transformed into Z2-value that is formed of bits I to J which are positioned lower than the most significant bit in the Z-value. The alpha value for each pixel is set at a value corresponding to the Z2-value. Representation of the depth of field or fog image is enabled by using the alpha value to generate an image. The Z2-value is clamped to a given value depending on a bit value other than the bits I to J of the Z-value. Bits M to N and K to L (where K≧I≧L>M≧J≧N) in the Z-value are set as index numbers in LUT1 and LUT2 and used to perform texture mapping for transforming the Z-value into Z3- and Z4-values. These Z3- and Z4-values are used to determine the Z2-value.

Claims24

Dependent claims

A game system which generates an image, comprising:

a memory which stores a program and data for image generation;
and
at least one processor which is connected to the memory and performs processing for image generation,
at least one processor including:
an index number setting section which sets image information of an original image as an index number in a lookup table for index color texture-mapping, the index color texture-mapping being texture-mapping which maps a texture onto a virtual object while referring to the lookup table, the index number being set to each texel of the texture in a texture space, and the texture linking to image information to be texture-mapped;
and
a drawing section which transforms the image information of the original image by performing index color texture-mapping on the virtual object by using the lookup table in which the image information of the original image is set as the index number, the virtual object constituting polygons having a size equal to a size of a block obtained by dividing a display screen into blocks, wherein
the index number setting section sets the index number corresponding to the image information of the original image for each of the blocks, which are specified by dividing the display screen, and
the drawing section performs the index color texture-mapping on each of the polygons for each of the corresponding divided blocks.

6 more elements

A computer-usable program embodied on an information storage medium or in a carrier wave, the program comprising a processing routine for a computer to perform operations comprising:

setting image information of an original image as an index number in a lookup table for index color texture-mapping, the index color texture-mapping being texture-mapping which maps a texture onto a virtual object while referring to the lookup table, the index number being set to each texel of the texture in a texture space, and the texture linking to image information to be texture-mapped;
and
transforming the image information of the original image by performing index color texture-mapping on the virtual object by using the lookup table in which the image information of the original image is set as the index number, the virtual object constituting polygons having a size equal to a size of a block obtained by dividing a display screen into blocks, wherein
the index number corresponding to the image information of the original image is set for each of the blocks, which are specified by dividing the display screen, and
the index color texture-mapping is performed on each of the polygons for each of the corresponding divided blocks.

2 more elements

A method of generating an image, comprising:

setting image information of an original image as an index number in a lookup table for index color texture-mapping, the index color texture-mapping being texture-mapping which maps a texture onto a virtual object while referring to the lookup table, the index number being set to each texel of the texture in a texture space, and the texture linking to image information to be texture-mapped;
and
transforming the image information of the original image by performing index color texture-mapping on the virtual object by using the lookup table in which the image information of the original image is set as the index number, the virtual object constituting polygons having a size equal to a size of a block obtained by dividing a display screen into blocks, wherein
the index number corresponding to the image information of the original image is set for each of the blocks, which are specified by dividing the display screen, and
the index color texture-mapping is performed on each of the polygons for each of the corresponding divided blocks.

2 more elements

Dependencies are inferred from the claim text.