Method and system for indexing three-dimensional solid model data based upon modification history

A method of processing for a three-dimensional (3D) solid model using predetermined commands, the 3D solid model being represented by three-dimensional (3D) data, comprising the steps of:

• a) generating the 3D solid model by specifying one of the predetermined commands with a parameter, the specified command selectively affecting a part of the 3D solid model;
• b) generating modification history data for the command in said step a), the modification history data including the specified command, the parameter, and an indirect index to the selectively affected part by the command;
• and
• c) modifying the 3D solid model using said indirect index of said modification history data, said indirect index accessing a part of the 3D data corresponding to the selectively affected part of the 3D solid model.

A three-dimensional (3D) solid model design system for designing a three-dimensional (3D) solid model using predetermined commands, the 3D solid model being represented by a three-dimensional (3D) data, comprising:

• a data builder for building the 3D data by executing one of the predetermined commands with a parameter, the command selectively affecting a part of the 3D solid model;
• a modification history data compiler for generating modification history data which includes the command, the parameter, and an indirect index to the selectively affected part by the command;
• and
• a data modifier for modifying the 3D solid model using said indirect index of said modification history data, said indirect index indicative of a part of the 3D data corresponding to the selectively affected part of the 3D solid model.