Arbortext IsoDraw > User's Reference > 3D Mode > 3D Tools > 3D Perspective Distance Tool
  
3D Perspective Distance Tool
Choosing Window > Projection > Perspective view in 3D mode activates the 3D Perspective Distance tool, which would otherwise be grayed out. Clicking on the symbol button opens the following dialog box:
Enter the required Perspective distance. Click OK to confirm your entry or Cancel to close the dialog box without making any changes. When the dialog box is closed the elements are depicted in the new perspective.
* 
You can enter values ranging from 0.1 to 10000. Note that the value for perspective distance can also be selected so that the observer is located inside the object. This can result in unwanted projections of elements located behind the observer.