Abstract: There is provided a display control program for a computer. The display control program includes: by an image generation block, setting a viewpoint position and a sightline direction in accordance with one of a position and an attitude of a head mounted display worn on the head of a user and rendering an object arranged in a virtual three-dimensional space so as to generate an image to be displayed on the head mounted display; and by a rotation control block, upon acquiring an instruction for rotating a game field arranged in the virtual three-dimensional space, rotating the game field around an axis perpendicular to the game field.

Abstract: There is provided a display control program for a computer. The display control program includes: by an image generation block, setting a viewpoint position and a sightline direction in accordance with one of a position and an attitude of a head mounted display worn on the head of a user and rendering an object arranged in a virtual three-dimensional space so as to generate an image to be displayed on the head mounted display; and by a rotation control block, upon acquiring an instruction for rotating a game field arranged in the virtual three-dimensional space, rotating the game field around an axis perpendicular to the game field.

Abstract: A game device includes: an image processing unit operative to display a screen image of a game field including vertical land features; a passage forming unit operative to form a passage in the game field through which fluid can move, in accordance with an instruction by a user; fluid control unit operative to control fluid supplied to the passage; and a terrestrial character control unit and an aquatic character control unit operative to control an action of a character disposed in the game field. The aquatic character control unit moves the character, which exists in the passage in which the fluid exists, together with the fluid when the fluid is moved along the passage to a lower position by the fluid control unit.

Abstract: A game device includes: an image processing unit operative to display a screen image of a game field including vertical land features; a passage forming unit operative to form a passage in the game field through which fluid can move, in accordance with an instruction by a user; fluid control unit operative to control fluid supplied to the passage; and a terrestrial character control unit and an aquatic character control unit operative to control an action of a character disposed in the game field. The aquatic character control unit moves the character, which exists in the passage in which the fluid exists, together with the fluid when the fluid is moved along the passage to a lower position by the fluid control unit.

Abstract: A plastic lens which can be positioned correctly during lens mounting. The plastic lens is used as a pickup lens on an optical head for an optical disk and it has a lens portion in the center with an annular rim formed on the periphery. The rim has two opposed surfaces, one of which provides a reference plane to effect positioning for fixing the plastic lens in a lens holder. The rim has a gate portion which remains to project from the periphery after a molten plastic material was injected through the corresponding channel during molding. The gate portion is cut off by a pair of cutting blades which are moved to come closer to each other in a direction substantially parallel to the optical axis of the lens portion. As the result of the cutting operation, a bur occurs at a distal end of the gate portion and it projects in a direction parallel to a plane orthogonal to the optical axis.

Abstract: A plastic lens which can be positioned correctly during lens mounting. The plastic lens is used as a pickup lens on an optical head for an optical disk and it has a lens portion in the center with an annular rim formed on the periphery. The rim has two opposed surfaces, one of which provides a reference plane to effect positioning for fixing the plastic lens in a lens holder. The rim has a gate portion which remains to project from the periphery after a molten plastic material was injected through the corresponding channel during molding. The gate portion is cut off by a pair of cutting blades which are moved to come closer to each other in a direction substantially parallel to the optical axis of the lens portion. As the result of the cutting operation, a bur occurs at a distal end of the gate portion and it projects in a direction parallel to a plane orthogonal to the optical axis.