一个简单的三维实体建模，用OCC内核进行三维实体的建模和简单的仿真功能-it is very good,if you need,you can use it, it can model three shape,thank you very much

Autocad VBA实现实体剖切 This example creates a box in model space. It then slices the box based on a plane defined by three points. The slice is returned as a 3Dsolid.(This example creates a box in model space. It then slices the box based on a plane