Three-dimensional model deformation system, method and computer readable program, and computer readable storage medium storing that program

A three-dimensional model modification method for modifying a three-dimensional model, defined by a plurality of surfaces and representing an arbitrary object, the method comprising:

• a base-curve generating step of fitting skeleton lines, representing a prerecorded approximate outline of the object, to a three-dimensional model to be modified and generating base curves on a basis of the skeleton lines, representing an approximate outline of the three-dimensional model to be modified;
• a first polygon forming step of forming polygons from free-form surfaces of the three-dimensional model to be modified and generating a group of points representing the free-form surfaces of the three-dimensional model to be modified;
• a base-curve modifying step of arbitrarily modifying, by an information processing apparatus, the base curves of the three-dimensional model, generated by the base-curve generating step, according to an instruction from an operator;
• a group-of-points displacing/determining step of displacing, by the information processing apparatus, the group of points, generated by the first polygon forming step and representing the three-dimensional model to be modified, based on base curve displacements from the base curves, generated by the base-curve generating step before arbitrary modification, to the base curves, generated by the base-curve modifying step after arbitrary modification, and determining the modified group of points corresponding to the displacement of the base curves, generated by the base-curve modifying step after arbitrary modification;
• and
• a second polygon forming step of forming new polygons from the modified group of points determined by the group-of-points displacing/determining step and generating a modified three-dimensional model defined by a plurality of surfaces, generated from the new polygons.

A non-transitory computer-readable recording medium storing a computer-readable three-dimensional model modification program for modifying a three-dimensional model, defined by a plurality of surfaces and representing an arbitrary object, the computer-readable three-dimensional model modification program, when executed by a computer, causing the computer to execute processes, the processes comprising:

• a base-curve generating process of fitting skeleton lines, representing a prerecorded approximate outline of the object, to a three-dimensional to be modified and generating base curves on a basis of the skeleton lines, representing an approximate outline of the three-dimensional model to be modified;
• a first polygon forming process of forming polygons from free-form surfaces of the three-dimensional model to be modified and generating a group of points representing the surfaces of the three-dimensional model to be modified;
• a base-curve modifying process of arbitrarily modifying the base curves of the three-dimensional model, generated by the base-curve generating process, according to an instruction from an operator;
• a group-of-points displacing/determining process of displacing the group of points, generated by the first polygon forming process and representing the three-dimensional model to be modified, based on base curve displacements from the base curves, generated by the base-curve generating process before arbitrary modification, to the base curves, generated by the base-curve modifying process after arbitrary modification, and determining the modified group of points corresponding to the displacement of the base curves, generated by the base-curve modifying process after arbitrary modification;
• and
• a second polygon forming process of forming new polygons from the modified group of points determined by the group-of-points displacing/determining process and generating a modified three-dimensional model defined by a plurality of surfaces, generated from the new polygons.