In complex CAD drawings, selecting the right objects is not always as simple as dragging a window around them. Mechanical details, architectural plans, dimensions, hatches and overlapping geometry can quickly make standard selection methods frustrating.
This is where the Crossing Polygon, commonly known as the CP command, becomes extremely useful. It gives you more control over what you select, especially when working inside crowded DWG files.
In this guide, we’ll look at how the CP command works in SmartCAD, why it matters, and how it can help you work faster without changing the drafting workflow you already know.
What Is the Crossing Polygon CP Command?
The CP command lets you draw a custom polygon-shaped selection boundary. Instead of being limited to a rectangle, you can click multiple points around the exact area you want to select.
Everything that is either inside the polygon or touching the polygon boundary will be selected. This makes it especially useful when you need to isolate geometry in dense drawings without accidentally selecting nearby objects.
For example, if you are editing a crowded floor plan or a detailed mechanical assembly, a normal crossing window may grab too many entities. The CP command gives you a cleaner and more precise way to work.
How to Use the CP Command in SmartCAD
The CP command is usually used inside another drafting command. In this example, we’ll use it with the Copy command.
1. Start the Copy Command
Type CO in the command line and press Enter.
2. Activate Crossing Polygon Mode
When SmartCAD asks you to select entities, type CP and press Enter.
3. Draw the Polygon Boundary
Click around the objects you want to select. You can create a flexible polygon shape instead of a standard rectangular window.
4. Confirm the Selection
After defining the polygon, press Enter. SmartCAD will instantly select all entities inside or touching the polygon boundary.
5. Complete the Command
Select your base point and place the copied objects wherever needed.
CP vs WP: Understanding the Difference
Many CAD users confuse the CP and WP commands because both use polygon-based selections. However, their behavior is different.
| Command | Behavior |
|---|---|
| CP – Crossing Polygon | Selects objects inside the polygon or touching the boundary. |
| WP – Window Polygon | Selects only objects fully inside the polygon. |
If you want faster selections in crowded drawings, CP is often the better option. If you need stricter control and want to avoid selecting anything touching the boundary, WP can be more useful.
Why Precision Selection Matters in CAD
Small workflow improvements can save a surprising amount of time over large projects. Commands like CP may look simple, but they help reduce repetitive mistakes and make editing complex drawings much smoother.
Professional CAD users often rely on advanced selection methods because modern DWG files are larger and more detailed than ever before. Efficient drafting is not only about hardware performance — it’s also about using the right tools efficiently.
This is one reason many professionals search for an affordable AutoCAD alternative that still supports familiar workflows and native DWG editing.
SmartCAD for Professional Drafting Workflows
SmartCAD is designed for engineers, architects, manufacturers and designers who want professional CAD tools without expensive subscription costs.
Because SmartCAD supports familiar commands and workflows, users can transition quickly without spending weeks relearning basic drafting operations.
Commands like Copy, Trim, Offset, CP and WP work the way experienced CAD professionals expect them to work. That familiarity helps teams stay productive from day one.
Combined with native DWG compatibility and perpetual license options, SmartCAD offers a practical solution for professionals looking for a capable modern CAD platform.
Final Thoughts
The Crossing Polygon command is one of those CAD tools that becomes more valuable the more you use it. Once it becomes part of your workflow, selecting entities inside crowded drawings feels significantly faster and more controlled.
If you regularly work with complex DWG files, learning the CP command is absolutely worth your time. Small workflow optimizations often make the biggest difference in long-term productivity.
Explore SmartCAD and improve your CAD workflow with familiar professional drafting tools.
