Image generating apparatus, method of generating image, program, and recording medium

A method of generating an image in which a contour line is drawn in each of a plurality of target objects existing in a virtual three-dimensional space and displaying the image on a display, the method comprising:

• setting, with a processor, a viewing point of a virtual camera and a direction of a viewing axis in the virtual three-dimensional space to a predetermined position and a predetermined direction;
• drawing, with the processor, a two-dimensional image acquired from performing a perspective transformation process for the plurality of target objects in accordance with the viewing point and the direction of the viewing axis of the virtual camera;
• setting, with the processor, a line width for the contour line of each of the plurality of target objects included in the two-dimensional image;
• detecting, with the processor, a contour of each of the plurality of target objects included in the two-dimensional image;
• drawing, with the processor, the contour line in the contour of each of the plurality of target objects;
• and
• generating, with the processor, the image composed of the two-dimensional image and the contour line drawn in the contour of each of the plurality of target objects,
• wherein the processor draws the contour line in the contour of each of the plurality of target objects by:
• determining whether a first target object of the plurality of target objects is overlapped with a second target object of the plurality of target objects, the second target object being closer to the viewing point of the virtual camera than the first target object;
• drawing the contour line in the contour of the first target object in a first line width when the first target object is determined not to be overlapped with the second target object;
• and
• drawing the contour line in a first part of the contour of the first target object that is overlapped with the second target object in a second line width that is set for the contour line of the second target object when the first target object is determined to be overlapped with the second target object and when the second line width is less than the first line width.

A non-transitory computer-readable medium including a program that causes a computer apparatus to perform a process for generating an image in which a contour line is drawn in each of a plurality of target objects existing in a virtual three-dimensional space and displaying the image on a display, the program causing the computer apparatus to perform:

• setting a viewing point of a virtual camera and a direction of a viewing axis in the virtual three-dimensional space to a predetermined position and a predetermined direction;
• drawing a two-dimensional image acquired from performing a perspective transformation process for the plurality of target objects in accordance with the viewing point and the direction of the viewing axis of the virtual camera;
• setting a line width for the contour line of each of the plurality of target objects included in the two-dimensional image;
• detecting a contour of each of the plurality of target objects included in the two-dimensional image;
• drawing the contour line in the contour of each of the plurality of target objects;
• and
• generating the image composed of the two-dimensional image and the contour line drawn in the contour of each of the plurality of target objects,
• wherein the program causes the computer apparatus to draw the contour line in the contour of each of the plurality of target objects by causing the computer apparatus to perform:
• determining whether a first target object of the plurality of target objects is overlapped with a second target object of the plurality of target objects, the second target object being closer to the viewing point of the virtual camera than the first target object;
• drawing the contour line in the contour of the first target object in a first line width when the first target object is determined not to be overlapped with the second target object;
• and
• drawing the contour line in a first part of the contour of the first target object that is overlapped with the second target object in a second line width that is set for the contour line of the second target object when the first target object is determined to be overlapped with the second target object and when the second line width is less than the first line width.