Display processing method and apparatus

A computer-readable, non-transitory storage medium storing a program for causing a computer to execute a display processing process for displaying a shape of an object including a trimmed surface generated based on a base surface, the display processing process comprising:

• dividing the base surface into a plurality of triangles;
• generating a loop polygon for loops including an outer loop for defining an outer shape of the trimmed surface and an inner loop provided, in the outer loop, depending on the shape of the object;
• identifying one or plural sight-line single-valued areas, each of which satisfies a condition that mapping onto a projection surface is bijection, includes plural triangles, and is an area on the base surface, based on a positional relationship between a viewpoint and the base surface;
• generating for each of the one, or plural sight-line single-valued areas, mask data that is data for controlling whether or not display is performed for each pixel from the sight-line single-valued area and the loop polygon;
• generating image data on the projection surface for each of the plurality of triangles;
• and
• performing a drawing processing from the mask data and the image data.

A display processing apparatus, comprising:

• a memory;
• and
• a processor or plural processors configured to use the memory and execute a display processing process for displaying a shape of an object including a trimmed surface generated based on a base surface, the display processing process comprising:
• dividing the base surface into a plurality of triangles;
• generating a loop polygon for loops including an outer loop for defining an outer shape of the trimmed surface and an inner loop provided, in the outer loop, depending on the shape of the object;
• identifying one or plural sight-line single-valued areas, each of which satisfies a condition that mapping onto a projection surface is bijection, includes plural triangles, and is an area on the base surface, based on a positional relationship between a viewpoint and the base surface;
• generating for each of the one or plural sight-line single-valued areas, mask data that is data for controlling whether or not display is performed for each pixel from the sight-line single-valued area and the loop polygon;
• generating image data on the projection surface for each of the plurality of triangles;
• and
• performing a drawing processing from the mask data and the image data.