OBJ files were first developed by Wavefront Technologies to save 3D meshes. The OBJ file format is a simple data-format that represents 3D geometry alone — namely, the position of each vertex, vertices are stored in a counter-clockwise order by default, making explicit declaration of normals unnecessary.
Example:
# List of Vertices, with (x,y,z) coordinates.
v 0.123 0.234 0.345
v ...
...
# Face Definitions
f 1 2 3
f 3 4 5
f 6 3 7
f ...
Optional information can also be stored for the face normals and textures. This information is currrently not read in.
dialog Options
Import points
This option imports the points in the OBJ file. It is currently always on and disabled.
Import surface as a Terrain TIN model.
Converts the surface to a TIN model (see TIN model). Note OBJ files can contain surfaces that have overturns and other more general 3D shapes. These surfaces are invalid TIN surface models in Terrain. A valid TIN surface can have only one Z value (elevation) for each x,y position.
