Using standard lights we have:
Omni lights with a spherical shaped beam that emits in all directions,
Spotlights with conical or pyramidal beams,
and direct light (cylinder or cube beams).
The mixture of these kinds of lights can produce an abundance of lighting and shadow effects.
Note: The following techniques may produce only lighting effect, you may need to create another group of lights to cast the shadows.
Two spot lights combined together to create a halogen light effect. Two cone layer effect.
1. Tube lights
This is based upon my own observations on a tube lights. The beam of the light looks like the picture below.
In my previous example, I just mentioned only the far attenuation, but in this case we need to use the near attenuation to create the ring effect. I use and omni and turn on the near attenuation. The area in between the near attenuation has no light so the effect looks like a ring.
The sphere light is easy to create. We just put an omni inside a sphere object (that is light source). The light emits from every surface on the sphere as its attenuation form is as same as omni, but its shadow depends on how big the light source is, so we need to adjust the shadow's softness to follow the size of the light source.
Environment light is light that is scattered around a scene. It's also considered as an area light as the light will effect in every part of the object.
A good example for this is skylight in an exterior scene:
"Skylight is the light from atmoshere, simulated by the reflectance of sunlight over the sky, cloud and everthing in the atmoshere. As the light is scattered and affected in every direction in atmosphere so we also considered it as a big dome of an area light in the scene in CG."
As mentioned in the previous example, first we imagine the area light shape as a 3d object (that we've assumed skylight shape is like a dome) and then place standard lights perpendicular to every surface on the object. In this case I choose freespots for faking the effect by placing them around the imagined dome. The dome light also result a good soft shadow effect.
1. Create a unit freespot light and change the color to light blue and enable overshoot.
Not only is skylight good for faking environment light, itis also suitable for any exterior and stand alone objects in the scene.
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