Short description
- Creates a 3D offset of a selected 3D polyline.
- Converts the original 3D polyline into a temporary 2D polyline.
- Applies a user-defined offset distance.
- Reconstructs a new 3D polyline using original Z-coordinates.
- Restores system variables and cleans up temporary entities.
Command:
- Command name: OFFSET3D
- Select a 3D polyline when prompted.
- Enter the offset distance via keyboard input.
Description:
- Saves current system variables (OSMODE, PLINETYPE, VIEWDIR).
- Switches to World UCS and disables object snaps.
- Extracts all vertex coordinates from the selected 3D polyline.
- Generates a temporary 2D polyline using XY coordinates only (Z set to 0).
- Offsets the temporary 2D polyline by a specified distance.
- Reads offset vertex coordinates.
- Creates a new 3D polyline by combining offset XY values with original Z values.
- Deletes temporary 2D polylines.
- Restores original system settings.
Helper function: (if any)
- Function name: polypt
- Validates whether the selected entity is a POLYLINE.
- Iterates through all vertices until SEQEND is reached.
- Extracts X, Y, and Z coordinates (group code 10).
- Stores vertex coordinates in the global list ppt_list.
- Displays an error message if the entity is not a polyline.
Functionalities:
- 3D polyline vertex extraction.
- Temporary 2D polyline generation.
- Keyboard-driven offset distance input.
- Automated 2D offset operation.
- Reconstruction of a 3D polyline with preserved elevation values.
- Automatic cleanup of intermediate geometry.
- System variable state preservation and restoration.
Result:
- 3D polyline vertex extraction.
- Temporary 2D polyline generation.
- Keyboard-driven offset distance input.
- Automated 2D offset operation.
- Reconstruction of a 3D polyline with preserved elevation values.
- Automatic cleanup of intermediate geometry.
- System variable state preservation and restoration.
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Categories: AutoCAD_Lips
Tags: 3D