![]() ![]() Each patch is surrounded by its own outline. Set of patches are described by set of single patches. The surface looks the same from both sides. ![]() Open shells are displayed as zero-thickness patches. Also, you can select one or more or all patches and create a shell with defined thickness, by offsetting of selected patches. If necessary, you can convert open shells to objects with missing patches and perform these operations at converted objects. Open shells do not support any volume or moment of inertia calculations, and do not support any Boolean operations or blending. ![]() However, open shells contain also curves surrounding only one patch. ![]() Open shells are also described similarly as closed surfaces by patches and 3D curves with two adjacent patches. Thru missing patch, you can see the solid from inside – patches are inside out there. Solids with missing patches are displayed as “objects with holes”. These functions cannot work, if intersection curves created, for instance, by Boolean cut intersect an edge of a missing patch. Boolean operations and edges blending may be limited, though. Objects with missing patches support most of VariCAD 3D operations, except volume and moment of inertia calculations. Also, patches may be deleted in corresponding VariCAD command – see below. During STEP import, due to detected problems, one or several patches were deleted. This type of object was originally created as a solid, described by closed surfaces. All operations available for 3D objects in VariCAD are supported. Each such curve connects two adjacent patches. Each patch has outline created by 3D curves. Example of a closed surface, missing patch and open shellĬlosed surface means that an object – solid is completely surrounded by patches. ![]()
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