实体坐标系拓扑转换过程

object->face & vertex & edge

face->vertex & edge

Step1

1. calculate a object's faces、edges and vertices properties based on a objected or handle.

2. Get Object ECS to WCS.

Step2

1. Get face Transform Matrixes to Object in ECS.

2. Get edge Transform Martrixes to Face( or Object) in ECS

3. Get vertex Transform Martrixes to Face(or Object) in ECS.

Step3

1.draw a cylinder based on WCS.

2. Transform the WCS to ECS.

ECS.Matrix  *  WCS.Martrix

 

                                                                                 Figure 1 Transform Matrix 3X4

                                                                                Figure2    Rotate Matrix 3X3