Spherical Blend TextureEdit
This technique maps a spherical blend texture to the outsides of an object.
Create a new material and name it something intelligent. Create a new texture for this material, change the texture type to Blend, and then in the texture properties, change the blend shape to "Sphere".
This is a technique that a rather famous blender user called "@ndy" uses. Very simple and effective.
All you need to do is place a Hemi light BEHIND the object you want to light in respect to the active camera.
Breakdown: First add a Hemi lamp to your scene:
Next, Select the lamp THEN press and hold down the Shift key, and select the Camera. Press Control-C to bring up the copy attributes menu, and copy location AND rotation.
Now select JUST your lamp, press R to rotate it, then press the X key TWICE to rotate around the local X axis. Using your numpad, key in "180" to rotate the object 180Degrees.
All that remains to do is to press G to grab the lamp, then press Z TWICE to move along the local Z axis, and move the lamp until it is past and behind the object of interest. your resulting setup should look something like this:
- Color ramp with input set to normal.
Pretty straighforward, but many advise against it.
- Minnaert shader
Available in 2.37, "Darkness"<1 actually brightens edge. A cool shader, but not very useful for this purpose.