Use this forum to ask questions about DataCAD 18 and DataCAD LT 18.
#69572 by LotharQ
Wed Aug 03, 2016 3:59 pm
I'm trying to get a grasp on entering objects in parallel views but I am confused about something that I would think would be pretty simple process. Lets say that I want to enter a 3D line from the front view using absolute cartesian and I use 0,0 as my starting point. Why does Dcad start the 3d line somewhere other that absolute zero? When I am in plan view that's the point that is always used so why would it be any different in parallel views.

Thank you,
#69585 by LotharQ
Fri Aug 05, 2016 1:09 am
Thanks for responding Josh. I'm not interested in the 3D line itself. We could be talking about locating any 3D object. What I am trying to get at is that you would think, regardless of the parallel view, that the 0 X-point and the 0 Y-point would be the same location as it is in an ortho view. But when you go the front or a left view and input an object starting at 0,0 using absolute cartesian it starts the object at some random point in space. That's where I need the help. I was hoping that maybe Mark or one of the Dcad guys would respond at some point.
#70292 by Mark F. Madura
Sun Nov 27, 2016 2:26 pm
When you are creating 3D Lines, note the status of [F6] 3D Cursor. When this is enabled, DataCAD will expect three-dimensional coordinate input. The message line will say "3D cursor input. World coordinate snapping enabled."

If you toggle the [Insert] key while the 3D cursor is enabled, you'll find there are three input methods:

- Relative / Absolute Cartesian (X, Y, Z)
- Relative / Absolute Cylindrical (Distance, Angle, Z)
- Relative / Absolute Spherical (Distance, Plan Angle, Rise Angle)

If you are in Absolute Cartesian and enter 0, 0, 0 for the coordinate, this will in fact coincide with the drawing's origin.

When the 3D cursor is not enabled, you are working on the active construction plane which has it's own relative x, y, and z coordinates. On the 3D Menus, 3D Views, Controls menu, there is a Reset option to coordinate the construction plane origin and snap grid with the Ortho (Plan) view. This is where you'll also find the option to set the viewing center.

When the 3D Cursor is enabled, you can also use three-dimensional Object Snapping. When the 3D Cursor is off, you are snapping to the construction plane.

If you create three-sided polygons using the 3D Entity, Polygons, Inclines 3 Edge Poly, the 3D Cursor is enabled automatically. The 3D Cursor is optional when creating 3D Lines, Contours, and 3D Markers. All other 3D entities must be entered relative to the current construction plane.

I did create a video on using DataCAD's 3D Rotate Command which may find helpful.

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