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Eliminating duplicated geometry

From: AutoCAD: Tips, Tricks, and Industry Secrets

Video: Eliminating duplicated geometry

When working in a production environment it's important that your drawings contain only necessary linework. You want to make sure that you eliminate any duplicated geometry. Having unnecessary redundant linework makes your file sizes larger. They can skew your quantity calculations and in the event your geometry is going to be cut out using a CNC machine, duplicates can render a drawing unusable. In this lesson we're going to learn how to remove any duplicated or unnecessary geometry from a drawing. On my screen I have an architectural example.

Eliminating duplicated geometry

When working in a production environment it's important that your drawings contain only necessary linework. You want to make sure that you eliminate any duplicated geometry. Having unnecessary redundant linework makes your file sizes larger. They can skew your quantity calculations and in the event your geometry is going to be cut out using a CNC machine, duplicates can render a drawing unusable. In this lesson we're going to learn how to remove any duplicated or unnecessary geometry from a drawing. On my screen I have an architectural example.

This geometry represents some linework that you might find in a kitchen. I am going to start by erasing one of these tools. I'll launch the Erase command. I'll select the stool and press Enter-- and that didn't work. Let's try it again. I'll launch the Erase command, I'll select the stool, and I'll press Enter. Has this ever happened to you? At first you might think there is a problem with the Erase command. In reality there is nothing wrong with erase. The problem is I have multiple insertions of the same block.

If I make a crossing window over the stool, you can see I have six more at this location. Let's press Escape. I am going to make a crossing window over this geometry and I can see I have five stools at this location. After seeing this, I have to question if I have any other duplicated line work in this file. Let's hover over the edge of the countertop. I can see this is a nice closed polyline. If I hover over this edge, I can see that I have a line segment that's duplicating part of this geometry.

Let's hover over the wall. It looks like this portion of the wall is a polyline. If I however over this side, I can see that I have another extra line segment on this side of the drawing. So it's obvious now that I have to scan this drawing and remove all of the duplicated geometry. The tool I am going to use is on the Express Tools tab. It's in the Modify panel. I am going to select Delete Duplicates. The official name for this command is Overkill. I will then select all of the objects in the drawing and I'll press Enter.

AutoCAD then brings up a dialog box. Since we're asking AutoCAD to delete duplicates, these settings control how similar the objects have to be before one of them is removed. Notice that I have several Ignore settings. Let's say for a second that I have two identical circles and each circle is on its own layer. If I check to ignore the layer property, AutoCAD will eliminate one of those circles. I can do the same thing with LINETYPE, COLOR, LINEWEIGHT and PLOTSTYLE. Now I know for a fact in this drawing I have not forced any line types or colors or any of these properties on my objects.

However I am going to check Ignore LAYERS, in the event I have duplicated geometry on two different layers. Let's look at Numeric fuzz. How geometrically similar the objects have to be. If this is set to 0, the objects will have to be identical to 14 spaces to the right of the decimal. Now since we're dealing with a microscopic level of precision, I am going to click in this field and I'll set this to 0.00001.

This says that if the geometry differs in the fifth decimal space, the entities are close enough to be called identical. At the bottom of the dialog box we can control how AutoCAD deals with lines, arcs, and polylines. For instance, if I check END to END, AutoCAD will combine collinear objects that meet END to END into a single entity. If I check OVERLAP, AutoCAD will combine collinear objects that overlap into a single entity. Probably the most powerful option is this one, PLINES. If I check this, AutoCAD will remove any overlapping redundant geometry in my polylines.

It will also compare my polylines to the individual lines and arcs in the drawing. If I have a line or arc that duplicates a segment within a polyline, AutoCAD will revise the polyline to remove the duplicated segment. For the purposes of this example, I'm going to leave all of these checked except for END to END. Let me drag this dialog box down. That's because I do have two collinear objects that meet END to END right here and I'd like those to remain as separate objects. Now that I'm finished, I'll click OK and if we look at the command line we can see that 16 duplicates were deleted.

Let's verify some of this geometry. I am going to make a crossing window over the stool and I can see that I have a single block reference. Let's hover over the countertop. I can see the polyline was broken at this single line segment. If I do a crossing window across this geometry, I can see that I only have one entity there. Likewise if we take a look at the wall segment I can see the polyline was broken at this individual line and if I do a crossing selection, I can see I only have one entity there as well.

So in the event your drawing has some unnecessary geometry, give it a quick scan with the Overkill command. Using Overkill, you can ensure that your drawings are geometrically cleaned of any duplicated linework.

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This video is part of

Image for AutoCAD: Tips, Tricks, and Industry Secrets
AutoCAD: Tips, Tricks, and Industry Secrets

66 video lessons · 8325 viewers

Jeff Bartels
Author

 
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  1. 1m 28s
    1. Welcome
      53s
    2. Using the exercise files
      35s
  2. 47m 11s
    1. Adding relevant data to Quick Properties and tooltips
      5m 38s
    2. Creating custom ribbon tabs and panels
      8m 55s
    3. Creating macro-enabled tools
      10m 29s
    4. Increasing speed with command aliases
      4m 44s
    5. Finding commands and system variables using Auto Complete
      2m 35s
    6. Optimizing the size of palettes
      3m 17s
    7. Accessing drawings using Favorites
      2m 25s
    8. Controlling notification bubbles
      2m 24s
    9. Restoring hidden messages
      3m 53s
    10. Following a blog from within AutoCAD
      2m 51s
  3. 1h 0m
    1. Disabling mode settings on the fly
      3m 28s
    2. Finding hatch boundaries in busy drawings
      3m 32s
    3. Generating boundaries from difficult shapes
      2m 20s
    4. Calculating the overall length of multiple entities
      6m 16s
    5. Calculating the area of multiple shapes
      4m 42s
    6. Flattening geometry to a single elevation
      4m 0s
    7. Trimming all entities to one side of an object
      2m 42s
    8. Eliminating duplicated geometry
      5m 10s
    9. Creating true offsets
      3m 44s
    10. Finding errors when joining multiple entities
      6m 48s
    11. Moving and copying entities using Windows shortcuts
      2m 24s
    12. Solving expressions using the command prompt calculator
      5m 1s
    13. Using the Calculator palette
      10m 25s
  4. 21m 17s
    1. Bringing all text objects to the front
      1m 20s
    2. Underlining single-line text
      1m 21s
    3. Managing numbered and lettered lists
      3m 36s
    4. Creating superscript and subscript text
      3m 18s
    5. Removing formatting from MTEXT
      3m 26s
    6. Using fields to identify who revised a drawing
      3m 10s
    7. Squeezing text into tight spaces
      3m 5s
    8. Hiding extra annotative scales
      2m 1s
  5. 16m 55s
    1. Creating "one-click" dimensions
      1m 52s
    2. Dimensioning angles greater than 180 degrees
      1m 40s
    3. Creating dynamic dimension breaks
      2m 20s
    4. Making linear dimensions act like aligned dimensions
      2m 44s
    5. Finding dimensions with false values
      1m 38s
    6. Creating parent/child dimension styles
      4m 45s
    7. Making dimensions easier to read
      1m 56s
  6. 14m 40s
    1. Making global edits to attribute data
      4m 1s
    2. Clipping references using curved geometry
      2m 21s
    3. Exchanging one block symbol for another
      3m 3s
    4. Using drag-and-drop to insert content
      3m 17s
    5. Creating a block library in two clicks
      1m 58s
  7. 10m 42s
    1. Making global changes to layer names
      3m 19s
    2. Converting all object properties to BYLAYER
      1m 43s
    3. Navigating layer lists using the keyboard
      2m 5s
    4. Producing a hard copy of the layer settings
      1m 34s
    5. Removing stubborn layers
      2m 1s
  8. 25m 1s
    1. Accessing viewports within viewports
      3m 21s
    2. Creating viewports with islands
      6m 5s
    3. Creating legends using the Change Space tool
      3m 55s
    4. Rotating viewport content to match layout
      4m 55s
    5. Importing layouts from template files
      2m 3s
    6. Visualizing multiple design alternates
      4m 42s
  9. 30m 18s
    1. Consolidating backup files into a single folder
      2m 48s
    2. Launching applications from within AutoCAD
      3m 53s
    3. Creating custom linetypes
      5m 9s
    4. Incorporating symbols into custom linetypes
      2m 48s
    5. Salvaging data from a corrupt drawing
      3m 57s
    6. Applying hyperlinks to drawing objects
      3m 34s
    7. Converting drawings from name-based to color-based plot styles
      2m 0s
    8. Identifying the owner of a drawing
      1m 18s
    9. Incorporating drawings into PowerPoint presentations
      4m 51s
  10. 31s
    1. Goodbye
      31s

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