Use masks to block out areas of a surface and prevent them from being displayed or to render a section of the surface using a specified render material.
Masks can be defined from AutoCAD Civil 3D parcels and from the following types of polygon-type objects:
When you define a mask from a selected object, the mask geometry automatically updates when you make changes to the original object. If the original object is deleted from the drawing, the mask is also deleted.
The display of the mask is based on the display settings of the referenced surface style. The display type is either trimmed to the segments of the mask or crosses the segments:
* Border display is not affected by masks.
The following illustration is an example of crossing display (triangles):
The following illustration is an example of trimmed display (contours):
Topics in this section
- Types of Masks
Define one of the two types of surface masks: outside or inside.
- Creating a Mask
Create masks by selecting existing parcels or AutoCAD polygon-type objects.
- Viewing Masks
Select and view masks in the Prospector tab item view.
- Changing the Display Order of Render Only Masks
Use the Mask Display Order dialog box to change the display order of a selected render-only mask.
- To view and modify a mask’s properties
Use the Mask Properties dialog box to edit a mask’s properties. You can also modify the extents, location, and positioning of a mask using the appropriate AutoCAD command (depending on the type of the originating object).
- Deleting a Mask
Use the Prospector tab to remove a mask from a surface by deleting the mask or by deleting the AutoCAD object that it was created from.