1. A game device having a processor and a memory configured for controlling a game executed inside a game field representing a field of play of a video game, comprising: means for carrying out processing of game content executed inside the game field based on player operations; means for changing a value σ1 that varies based on an angle θ between a viewing direction and a base line, said angle θ having a value between 0 and 2π, said value σ1 relating to an image composition; and means, for generating a composite image composed of a pixel value P0 representing a base model, which is added to a first pattern image data P1×σ1 representing a first model, to generate and store a new pixel value P0+P1×σ1, said new stored pixel value P0+P1×σ1 being added to a second pattern image data to generate and display the composite image on the surface of a substantially planar game field.