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How to Plot Hidden Lines

Posted on September 21st, 2018. Last updated on May 16th, 2022.

How you plot hidden lines in AutoCAD depends upon whether you are plotting from model space or paper space. Plotting from paper space is recommended.

Plotting Hidden Lines From Paper Space

To plot hidden lines in paper space, you need to tell the viewport you are plotting to hide the entities in it before plotting them.

  1. Type MVIEW at the command line.
  2. Type S for shadeplot.
  3. Type H for hidden
  4. Select the viewport.

This setting will be saved with the drawing.

Plotting Hidden Lines From Model Space

To plot hidden lines in model space, you need to set the Shade plot setting to Legacy hidden.

  1. Type PLOT at the command line.
  2. Expand the Plot – Model dialog box so that the Shaded viewport options are visible. Do this by pressing the arrow in the bottom right of the dialog box, as shown below.
  3. Set Shade plot to Legacy hidden.

This setting will be saved with the drawing.

If you plot from the command line, you need to select a detailed plot configuration. One of the prompts will be Enter shade plot setting. Answer Legacy hidden to that prompt to plot with hidden lines.

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Common Problems with Hidden Lines

If you experience issues plotting hidden lines, check your scale, SPLFRAME, and HIDEPRECISION settings.


How to View Hidden Lines

Use the standard CAD command HIDE to view hidden lines, and the REGEN command to hide them again.


How to Make Dashed Ductwork

You can set your ductwork to be drawn with dashed lines using the Layers customization command.


Duct-Mounted Diffusers

Design Master HVAC does not have a command specifically for inserting or connecting duct-mounted diffusers and grilles. However, you can approximate them by inserting the diffuser close to the duct to which it is mounted.


Ductwork Double Lines Are Overextended

If double lines are being drawn past where the duct centerline ends, you may need to straighten some of your ducts.


Bring Objects in Front of Ductwork

Use the Move Entity Above/Below Ductwork commands to set whether objects on the drawing should be hidden by ductwork when using the standard CAD HIDE command.