If neither of these options is the cause of your problem, it is possible that your meshes are too dense or too complex for Rhino to render them properly. Make sure that the “Invisible” option is not checked.
To check for this, select all of the objects in your scene and go to the Object Properties dialog.
Another possibility is that you have objects in your scene that are set to be invisible in rendered images. To check this, go to the Render tab of the Rhino options dialog and make sure that the “None” display mode is not selected. One possibility is that your Render settings are set to use the “None” display mode. There are a few reasons that might cause all of your meshes to turn black in Rhino.
