Creating New Bodies From Existing Entities

Contents

• 71.1 Introduction
  • 71.1.1 Copying faces to create new bodies
• 71.2 Removing faces to create new bodies
• 71.3 Healing wounds
• 71.4 Removing edges to create new bodies

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71.1 Introduction

Parasolid can create new solid bodies from existing faces in a body, either by copying them or by removing them from the existing body. If the faces used to create a body are such that the body contains wounds, then they are healed using the same techniques used for deleting face

71.1.1 Copying faces to create new bodies

PK_FACE_make_solid_bodies creates a solid from an array of faces by copying the selected faces to make one or more new solids. The faces are not deleted from the original body and if the faces form a shell of a sheet or a solid, the shell is then copied to the new solid. Any missing faces of the shell are treated as holes to be healed as described in Section 71.3, “Healing wounds”.

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71.2 Removing faces to create new bodies

PK_FACE_remove_to_solid_bodies removes faces from a body and uses them to make one or more new solid bodies.

• The new bodies are considered to be child bodies
• The original body is considered to be the parent body.

Any wounds left in either parent or child bodies can be healed as described in Section 71.3, “Healing wounds”. Wounds in parent bodies and child bodies can be healed differently if desired.

Figure 71-1 Healing holes (wounds) using ‘Grow from Parent’

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71.3 Healing wounds

Wounds created by PK_FACE_make_solid_bodies or PK_FACE_remove_to_solid_bodies can be healed using similar methods to those available to PK_FACE_delete_2. See Chapter 63, “Deleting Entities” for full details.

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71.4 Removing edges to create new bodies

PK_EDGE_remove_to_bodies removes wireframe edges from a body and uses them to make a number of new bodies. It receives and returns the following arguments:

n_edges

edges

options

n_parent_bodies

parent_bodies

n_child_bodies

child_bodies

tracking

PK_EDGE_remove_to_bodies takes an array of edges and splits their owning bodies into child and parent bodies. Child bodies result from edges and parent bodies result from the remaining body.

If allow_disjoint is PK_LOGICAL_false, multiple child and parent bodies can be returned, depending on the connectivity of the parent and child components. In the example illustrated in Figure 71-2, one child and two parent bodies are returned. Figure 71-3 illustrates a case where allow_disjoint is PK_LOGICAL_true, and therefore only 2 bodies are returned; one child and one parent body.

Figure 71-2 Splitting a body when disjoint bodies are not allowed.

Figure 71-3 Splitting a body when disjoint bodies are allowed.

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