Abstract: A disclosed method for displaying a shape of an object including a trimmed surface generated based on a base surface includes: dividing the base surface into plural 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 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 plural sight-line single-valued areas, mask data 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 triangles; and perform drawing using the mask data and image data.

Abstract: A disclosed method for displaying a shape of an object including a trimmed surface generated based on a base surface includes: dividing the base surface into plural 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 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 plural sight-line single-valued areas, mask data 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 triangles; and perform drawing using the mask data and image data.

Abstract: A three-dimensional shape is displayed at a high speed on the basis of compressed data. A subdivision pattern for at least one face that forms the three-dimensional shape is determined on the basis of three-dimensional shape data that defines the three-dimensional shape by the face. At the same time a curved face shape of the face is determined on the basis of the position of the vertices of the face and the direction of normals at the vertices defined in advance in the three-dimensional shape data. Then the determined curved face shape is subdivided according to the determined subdivision pattern and a plurality of faces are generated on the curved face shape. A three-dimensional shape formed by the plurality of faces generated is displayed.

Abstract: A three-dimensional shape is displayed at a high speed on the basis of compressed data. A subdivision pattern for at least one face that forms the three-dimensional shape is determined on the basis of three-dimensional shape data that defines the three-dimensional shape by the face. At the same time a curved face shape of the face is determined on the basis of the position of the vertices of the face and the direction of normals at the vertices defined in advance in the three-dimensional shape data. Then the determined curved face shape is subdivided according to the determined subdivision pattern and a plurality of faces are generated on the curved face shape. A three-dimensional shape formed by the plurality of faces generated is displayed.