| 摘要 |
<p>PURPOSE:To effectively use a memory and to perform the division of an area with respect to a free curved surface by judging whether a reverse Polish described formation data is a mathematical formation data, an operation code or the free curved surface. CONSTITUTION:The storing section of a formation data is adjusted to one reverse Polish described formation data 24 without dividing into an object structure data and a mathematical formation data. In a formation extract processing section 40, is is judged whether it is a mathematical information data 41, an operation code 42A or a free curved surface 45 and stored in a formation information stack area 46A. In this stack area 46A, all primitive informations are stored. The stored primitives are set and operated based on the object structure data 21 to obtain all formation information TS. A method for inputting a formation is easy to be understood by human beings intuitively and desired to be rich in representation ability. In this invention, the combination of an input by the primitive and a set operation is employed.</p> |
