Parasolid内核的功能可以总结为对实体和非实体对象的增(创建)删改查、校验修复、管理(场景,内存)、文件导入导出等，本节内容以创建基本三维实体作为开始，后续更新章节将逐步由浅入深涉及各部分内容。
一、Parasolid中的基本三维拓扑实体
Parasolid提供现成、简单、易用的API来创建以下几种基本三维Solid实体：
长方体 圆锥 圆柱 棱台 圆球 圆环
二、基本三维实体的创建方法
三维实体的创建结果均保存在PK_BODY_t中。 basis_set可控制立方体底部中心点位置以及长宽高三条边的朝向，basis_set如果为空（nullptr），则直接使用世界坐标系进行创建。
2.1 长方体
可控制长方体长宽高的尺寸以及长宽高三条边的朝向。
接口描述
PK_ERROR_code_t PK_BODY_create_solid_block
(
--- received arguments ---
double x, --- block extent in local x direction (>0)
double y, --- block extent in local y direction (>0)
double z, --- block extent in local z direction (>0)
const PK_AXIS2_sf_t *basis_set, --- position and orientation (may be NULL)
--- returned arguments ---
PK_BODY_t *const body --- solid body returned
)
创建方法
PK_AXIS2_sf_t axis;
axis.location = { -15, 10, 0 };
axis.axis = { 0,0,1};
axis.ref_direction = { 1,0,0 };
PK_BODY_t cube = PK_ENTITY_null;
PK_ERROR_code_t err = PK_BODY_create_solid_block(7,10,15, &axis, &cube);
2.2 圆锥
圆锥和圆台的创建使用同一个接口，radius控制圆台上底面的半径，当radius为0时为圆锥。
接口描述
PK_ERROR_code_t PK_BODY_create_solid_cone
(
--- received arguments ---
double radius, --- cone radius (may be 0)
double height, --- cone height (>0)
double semi_angle,--- semi-vertex angle (>0, <Pi/2)
const PK_AXIS2_sf_t *basis_set, --- position and orientation (may be NULL)
--- returned arguments ---
PK_BODY_t *const body --- solid body returned
)
创建方法
PK_AXIS2_sf_t axis;
axis.location = { 20, 10, 10 };
axis.axis = { 0, 0, -1 };
axis.ref_direction = { 0, 1, 0 };
PK_BODY_t cone = PK_ENTITY_null;
PK_ERROR_code_t err = PK_BODY_create_solid_cone(5, 10, 3.1415926 / 8, &axis, &cone);
2.3 圆柱
接口描述
PK_ERROR_code_t PK_BODY_create_solid_cyl
(
--- received arguments ---
double radius, --- cylinder radius (>0)
double height, --- cylinder height (>0)
const PK_AXIS2_sf_t *basis_set, --- position and orientation (may be NULL)
--- returned arguments ---
PK_BODY_t *const body --- solid body returned
)
创建方法
PK_AXIS2_sf_t axis;
axis.location = { 0, 10, 0 };
axis.axis = { 0, 0, 1 };
axis.ref_direction = { 0, 1, 0 };
PK_BODY_t cly = PK_ENTITY_null;
PK_ERROR_code_t err = PK_BODY_create_solid_cyl(6, 15, &axis, &cly);
2.4 棱台
radius为棱台底面轮廓外接圆的半径。
接口描述
PK_ERROR_code_t PK_BODY_create_solid_prism
(
--- received arguments ---
double radius, --- prism radius (>0)
double height, --- prism height (>0)
int n_sides, --- number of sides (>2)
const PK_AXIS2_sf_t *basis_set, --- position and orientation (may be NULL)
--- returned arguments ---
PK_BODY_t *const body --- solid body returned
)
创建方法
PK_AXIS2_sf_t axis;
axis.location = { -15, -10, 0 };
axis.axis = { 0, 0, -1 };
axis.ref_direction = { 0, 1, 0 };
PK_BODY_t prism = PK_ENTITY_null;
PK_ERROR_code_t err = PK_BODY_create_solid_prism(4, 5, 6, &axis, &prism);
2.5 球体
接口描述
PK_ERROR_code_t PK_BODY_create_solid_sphere
(
--- received arguments ---
double radius, --- sphere radius (>0)
const PK_AXIS2_sf_t *basis_set, --- position and orientation (may be NULL)
--- returned arguments ---
PK_BODY_t *const body --- solid body returned
)
创建方法
PK_AXIS2_sf_t axis;
axis.location = { 20, -10, 0 };
axis.axis = { 0, 0, -1 };
axis.ref_direction = { 0, 1, 0 };
PK_BODY_t sphere = PK_ENTITY_null;
PK_ERROR_code_t err = PK_BODY_create_solid_sphere(5, &axis, &sphere);
2.6 圆环
major_radius为圆环中心线的半径 minor_radius为环宽的一半
接口描述
PK_ERROR_code_t PK_BODY_create_solid_torus
(
--- received arguments ---
double major_radius, --- torus major radius
double minor_radius, --- torus minor radius (> 0)
const PK_AXIS2_sf_t *basis_set, --- position and orientation (may be NULL)
--- returned arguments ---
PK_BODY_t *const body --- solid body returned
)
创建方法
PK_AXIS2_sf_t axis;
axis.location = { 0, -10, 0 };
axis.axis = { 0, 0, -1 };
axis.ref_direction = { 0, 1, 0 };
PK_BODY_t torus = PK_ENTITY_null;
PK_ERROR_code_t err = PK_BODY_create_solid_torus(8, 3, &axis, &torus);
2.7 创建结果预览
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