Flattening Drawings Automatically

Use the Flatten command to automatically flattening drawings.

You can flatten all entities of the drawing or only a specified subset. For example, the SmartSelect command lets you select sets of entities by category.

Note: After flattening, resulting 2D entities retain their original Layers, LineStyles, and colors.

You can do the following:

• Create a 2D representation from a 3D model

  When you flatten a 2D view or a 3D view of a 3D model, the command projects the specified 3D entities onto the current viewing plan. The model view is created using 2D entities.

• Correct drawings that have unknown Z-coordinates

  While working on a drawing, it might happen to have properties, such as thickness, elevation or other not representative property for a 2D entity.

  Use one of the following tools to check if the drawing has Z-coordinates:

  • RollView commands
  • View Navigator

Note: Accuracy loss might occur in the following situations:

• Flattening without hidden lines
• Flattening a perspective view

Properties that may add elevation or Z coordinate to a 2D entity:

Entity	Properties
Polyline, Hatch, Cloud	Elevation
Line	Start Z, End Z
Circle, Arc, Ellipse	Center Z
Spline	Fit Point Z
Annotative Entities	Position Z

To flatten a drawing with unknown Z coordinates:

1. Do one of the following:
   On the menu, click XtraTools> Modify> Flatten.
   On the ribbon, click XtraTools> Modify> Flatten.
   • On the ribbon, click Home > Tools > Flatten.
   • Type Flatten.
2. Select all entities of the drawing with Z coordinate different than 0.

Alternatively, you can use the SmartSelect command to select the entities with varying Z-coordinates.

3. Press Enter.
4. To specify whether to remove hidden lines, type Yes or No.

   The drawing is flattened. All Z coordinates are 0.

Example:

Top view of a seemingly 2D drawing	3D view shows entities with Z coordinate
Flattened top view	3D view shows that all entities are in the same plane

To flatten a 3D view of a model:

1. In the graphics area, set up a suitable 3D view. Use the Views command.
2. Do one of the following:
On the menu, click XtraTools> Modify> Flatten.
On the ribbon, click XtraTools> Modify> Flatten.
• On the ribbon, click Home > Tools > Flatten.
• Type Flatten.
3. Select all entities of the drawing.

   Alternatively, you can use the SmartSelect command to select the entities to flatten.

4. Press Enter.
5. To specify whether to remove hidden lines, type Yes or No.

The 3D view is flattened onto the current viewing plane. The 2D representation is created using 2D entities.

Example:

A cylinder and a circle with thickness

3D view of the model	Flattened 3D view

Access

Command: Flatten