You can convert the Surfer GRD to an AutoCAD SCR script file that will draw the 3D wireframe in AutoCAD by following these steps:
- The AutoCAD wireframe has a limit of 256 grid lines in the X and Y direction. If your grid is larger, use the Grids | Resize | Extract or Grids | Resize | Mosaic commands to reduce the size of the grid.
- Click Grids | Edit | Convert and convert the GRD file to DAT XYZ (*.dat) file.
- Open the DAT file in the Notepad or WordPad.
- First, the X, Y and Z values need to be comma delimited. If they are not comma delimited, click Edit | Replace, enter a space for Find what and enter a comma for Replace with. Click Replace All to replace all the spaces with a comma, and then click Cancel to close the dialog.
- Insert a blank row at Row 1, and add the SCR header:
- 3dmesh nRows nColumns
- where nRows and nColumns are the number of rows and columns in the grid file. Simply have a single space between these values in the header (no commas).
- If you have blanked nodes in the grid, use the Edit | Replace function in Notepad to replace the blanked Z values (1.70141E+38) with the minimum Z value for the grid file.
- Click File | Save As to save the changes to a file name with the SCR extension and enclosed in double-quotes (e.g. "wireframe.scr").
- Run the SCR file in AutoCAD. For example, in AutoCAD 2002, click Tools | Run Script.
- You can use the 3D Orbit tool in AutoCAD (View | 3D Orbit) to change the rotation and tilt.
Updated February 10, 2017