I understand the issue you’re facing in AutoCAD, where new lines drawn in a 3D environment consistently have their endpoints at elevation 0, regardless of where you start them. Let’s troubleshoot this and find a solution:
System Variable Approach:
- You can adjust the OSNAPZ system variable to control whether AutoCAD snaps to the Z value of existing objects. Here’s how:
- Open the Command Line.
- Type OSNAPZ and press Enter.
- Set the value to 0 (zero) to ensure that snapping does not consider the Z value of existing objects.
- Confirm the change.
Manually Fixing the Drawing: If the system variable approach doesn’t resolve the issue, you can manually adjust the Z values for your objects:
- Select all the objects in your drawing (or only the ones with elevations).
- Open the Properties Palette.
- Click the object drop-down list and select an object type (excluding dimensions and hatches).
- Locate the elevation-related field (e.g., Position Z for blocks, Start Z and End Z for lines, etc.).
- Change the value to 0 (zero) for each object type.
- Repeat this procedure for other object types as needed.
AutoLISP Solution:
- If you prefer an automated solution, consider using the ALLFLAT AutoLISP program by Lee Mac. It quickly flattens objects to elevation 0. You can find the code on the CADtutor forum.
- Alternatively, explore SUPERFLATTEN by Joe Burke, which also addresses this issue but has some limitations with dimensions and OLE objects.
Remember to create a backup of your drawing before making any changes.
