Preparing Rhino File

BEFORE EXPORTING you should prepare your Rhino file:

  • Convert units to centimeters
    • Unreal expects geometry to be in cm. If you don't convert before exporting, lighting and other settings may not work correctly
    • Type UNITS at the command line, or right-click the units display at the bottom of the Rhino window. Change units to centimeters and click OK
    • When prompted, JUST CLICK YES. DON'T THINK ABOUT IT. JUST CLICK YES.
  • Organize objects by layer and material
    • You will export objects so that all objects on each layer will be treated as a SINGLE OBJECT in Unreal. This means that every object that will need a separate material or texture-mapping will need to be on its own layer in Rhino
  • Apply Texture Mapping if needed
  • Flip normals so they are unified
    • All objects on a given layer (and therefore treated as a single object in Unreal) needs to have their normals facing OUTWARD. Use the DIR command to check the direction of the normals, and use the FLIP option or command to reverse the normal direction.
   
Exporting Rhino File as OBJ

There are two strategies for exporting your file:

  • Export EACH LAYER as a SEPARATE OBJ FILE
    • This requires a little bit of planning and organization at first, but makes updating simpler
    • Exporting each layer is tedious, so use the following toolbar to automate the process:
      • OBJExport Toolbar
      • Note: The default mesh options in this toolbar are set to MEDIUM. - you may need to export specific layers or objects to achieve higher quality meshes if needed.
  • Export ENTIRE RHINO FILE as a SINGLE OBJ FILE
    • This is somewhat simpler at first, but will make it difficult to make changes in the future since you will have to export the entire file every time you make changes.
  • EXPORTING MANUALLY
    • If you export your file (or parts of it) manually (that is, not using the OBJExport Toolbar) you should be sure to set your OBJ export options as follows: