Bounding Prism

Bounding Prism

Ribbon: View – Viewport Tools > Bounding Prism
Menu: View > Bounding Prism
Toolbar: View toolbar > Bounding Prism
Command line: MCLIP

For each model space viewport, you can create a bounding prism – an area in a three-dimensional space, beyond which all the graphics are not displayed.

The area is defined as a rectangular or polygonal prism with grips. The prism can be:

• created by specifying a contour on the screen,
• created on the basis of an existing polyline,
• based on a bounding box of selected objects.
  

The prism above the XY plane of the UCS is blue, below it is orange. The grey outline of the prism is displayed in the XY plane.

Drag grips to place the upper and the lower prism cutoff planes. Otherwise the upper and lower displaying area will be unlimited.




A prism is created taking into account the direction of the UCS axes. The following is an example of constructing a prism based on the same polyline, but in different UCSs.

A bounding prism is created for each viewport. It will not restrict the image in other viewports.

At the time of creating or editing a prism, it is displayed in all viewports, but its effect only applies to the screen in which it was created or was selected for editing. When you finish adjusting the prism, it will crop the image only in the viewport for which it was created

To create a new or edit an existing prism, go to the desired viewport and run the Bounding prism command.

While editing a prism, you can switch to another viewport to continue editing it from a more comfortable angle. At the same time, editing of the prism that belongs to the previous viewport (in which the Bounding Prism Bounding prism command was run) will continue in the new viewport, and not the current one. A prism in its own viewport is displayed more vividly than in the others so that it is always clear which viewport it belongs to, regardless of which viewport is currently active.

For each model space viewport, its own bounding prism should be created.

An existing prism can be changed, deleted or disabled/enabled. If the prism is disabled, graphics outside the prism become visible. Disabled prism object is still present in the model space and can be switched on later.

When saving a document, the prism is also saved.

Options:

_.New	Create a new bounding prism for the current view of the model space.
Delete	Delete the existing bounding prism in the current view of the model space.
Modify	Change the existing bounding prism in the current view of the model space. Grips appear on the prism that allow you to change its geometry.
Enable	Activate the effect of an existing prism on the current view of the model space. Enabled by default.
Disable	Inactivate the effect of an existing prism on the current view of the model space. Prism is preserved, but does not limit the space of the view.
Exit	Exit command.

Command prompts when choose the New option:

_.polyLine	Select an existing closed polyline that will define the contour of the prism. Then, using grips, set the upper and lower prism cutoff boundary, if necessary. The prism will be built in the direction of the UCS axes of the current view.
Selection	Select the objects around which a rectangular prism will be built. Then, using grips, change the upper and lower prism cutoff boundary, if necessary.
Rectangular	Draw a rectangular contour that will define the contour of the prism. Then, using grips, set the upper and lower prism cutoff boundary, if necessary.
Polygonal	Draw a polygonal contour that will define the contour of the prism. Then, using grips, set the upper and lower prism cutoff boundary, if necessary.
_ eXit	Finish the process of creating a new prism.

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