Abstract: In a game system including a wireless LAN AP instrument and a portable game device, the AP instrument transmits a beacon signal including a MAC address of the AP instrument and a network ID obtained by encoding an instruction code so that the network ID can be decoded using the MAC address. The portable game device decodes the network ID included in the received beacon signal using the MAC address, and executes control based on control data when authenticity determination data included in the decoded instruction code coincides with specific data and the present date is within a valid period indicated by valid period data.

Abstract: A model object MOB (tree) having a plurality of part objects (branches) POB1 and POB2 each of which has a projection shape is arranged in an object space. Each of the POB1 and POB2 has a projecting portion formed on a display surface on which an image is drawn. The POB1 and POB2 are rotated so that the display surfaces thereof are directed toward a virtual camera VC. A Z texture for setting bump shapes on the display surfaces by pixel unit or forming a virtual projection shape on each of the display surfaces is mapped on the POB1 and POB2. When the VC rotates about a Y-axis and an X-axis while being directed toward a column-shaped part object (trunk) COB, the POB1 and POB2 are rotated so that the display surfaces thereof are directed toward the VC.

Abstract: In a game system including a wireless LAN AP instrument and a portable game device, the AP instrument transmits a beacon signal including a MAC address of the AP instrument and a network ID obtained by encoding an instruction code so that the network ID can be decoded using the MAC address. The portable game device decodes the network ID included in the received beacon signal using the MAC address, and executes control based on control data when authenticity determination data included in the decoded instruction code coincides with specific data and the present date is within a valid period indicated by valid period data.

Abstract: When an insect character generation control section has detected reception of a beacon periodically transmitted from an AP located in the current wireless communication area of a player's device, the insect character generation control section detects the MAC address of the AP which has transmitted the beacon. When the detected MAC address does not coincide with the previously detected MAC address, the insect character generation control section determines whether or not to generate an insect character according to a generation rate calculated by a generation frequency adjustment section. When the insect character generation control section has determined that an insect character is to be generated, the insect character generation control section determines the type of insect character to be generated by referring to insect character information, and displays a video image of the insect character on an insect cage screen on a lower screen.

Abstract: A detection device detects positions at which a sword-shaped controller traverses first and second sensor planes, which are formed by first and second sensors, respectively, and positions of which are associated in a one-to-one manner to positions on a screen. A position on the screen, an amount of change in the position per unit time, an absolute value of the amount of change of the position, and an orientation of the sword-shaped controller with respect to the screen are obtained from input information from the detection device. At least one of a special-effect image, a sound effect, and a parameter that causes a change in the special-effect image is changed, based on one of the obtained position, amount of change in the position per unit time, absolute value of the amount of change in the position, and the orientation of the sword-shaped controller, so that a special effect is changed with respect to the operator of the sword-shaped controller.

Abstract: A model object MOB (tree) having a plurality of part objects (branches) POB1 and POB2 each of which has a projection shape is arranged in an object space. Each of the POB1 and POB2 has a projecting portion formed on a display surface on which an image is drawn. The POB1 and POB2 are rotated so that the display surfaces thereof are directed toward a virtual camera VC. A Z texture for setting bump shapes on the display surfaces by pixel unit or forming a virtual projection shape on each of the display surfaces is mapped on the POB1 and POB2. When the VC rotates about a Y-axis and an X-axis while being directed toward a column-shaped part object (trunk) COB, the POB1 and POB2 are rotated so that the display surfaces thereof are directed toward the VC.

Abstract: An image generation apparatus, method and recording medium capable of expressing natural shadows with respect to changes of the motion of the character and creating shadows with less load on the CPU. It is possible to express a natural shadow with respect to changes of a motion of a character by changing density, degree of transparency and scale of a shadow object according to the positional relationship, speed relationship between a three-dimensional body and topographical object or environment surrounding the observing point etc. Even if the character has at least two legs (reference legs) and moves these legs, it is possible to determine the scale of the shadow object after the motion and display the shadow object based on desired reference points.

Abstract: A detection device detects positions at which a sword-shaped controller traverses first and second sensor planes, which are formed by first and second sensors, respectively, and positions of which are associated in a one-to-one manner to positions on a screen. A position on the screen, an amount of change in the position per unit time, an absolute value of the amount of change of the position, and an orientation of the sword-shaped controller with respect to the screen are obtained from input information from the detection device. At least one of a special-effect image, a sound effect, and a parameter that causes a change in the special-effect image is changed, based on one of the obtained position, amount of change in the position per unit time, absolute value of the amount of change in the position, and the orientation of the sword-shaped controller, so that a special effect is changed with respect to the operator of the sword-shaped controller.

Abstract: An image generation apparatus, method and recording medium capable of expressing natural shadows with respect to changes of the motion of the character and creating shadows with less load on the CPU. It is possible to express a natural shadow with respect to changes of a motion of a character by changing density, degree of transparency and scale of a shadow object according to the positional relationship, speed relationship between a three-dimensional body and topographical object or environment surrounding the observing point etc. Even if the character has at least two legs (reference legs) and moves these legs, it is possible to determine the scale of the shadow object after the motion and display the shadow object based on desired reference points.

Abstract: The object is the provision of an image generating device and information storage medium such that even a player of low strength or the like can smoothly move a moving body in an object space. Based on a pedaling force PF corresponding to kinetic energy input using pedals, and a course attractive force AF pulling in the direction of progress along a course in object space, a moving body is moved along the course in the object space. The kinetic energy is obtained, for example, by a player moving an operating means with a hand or foot. The course is given vertical relief, and moving body is moved based on PF, AF, and gravity. When the moving body is on a level ground, or when the pedals are not being turned the course attractive force AF is disabled. In the case of a multi-player game in which a plurality of moving bodies are moving, the magnitude of the course attractive force AF is varied according to the distance from the moving body in first position or the rank order of the moving bodies.