You're looking at a scene created in WTStudio. To see the various effects that different light types will have on your scene, simply select a light type from the drop-down box. In each case, the light is positioned in the middle of the columns, just above the plant. If you're not seeing any shadows, it's because the light maps haven't been produced yet - just give your computer a moment to continue chugging. (This is an option in WTStudio - you can choose to generate the light maps on the fly to save on download time.) Below is a brief description of each type of light shown in this lab. To see the scene from specific angles, simply drag the mouse.
Ambient
Ambient lights apply the specified color of light to all surfaces in the scene,
regardless of how far they are from the light or the orientation of their surface
normals. Usually they are only used in conjuction with other types of lights as
a "filler" for otherwise pitch black areas. Position and orientation of Ambient
lights do not matter. In WTStudio, Ambient lighting is a property of the world.
Point
These cast light in all directions from their location. The light intensity attenuates
(falls off) over distance from the light, based on the light function.
Parallel Point
These are just like Point lights, but the intensity remains constant into
infinity. Keep in mind that the brightness of a face will still depend upon the surface
normal's angle with the light rays.
Directional
Directional lights create light rays in only one direction within the range of
the light (infinity by default).
For this reason, the orientation of a directional light
is critical, but the position only matters if you have set a range on the light.
In WTStudio, you must specify a face of your cut Brush
to be Transparent for Directional light to enter.
Spot
Spot lights are exactly what your intuition tells you. They affect
only a defined area of your scene. Spot lights are
modeled by defining two areas of brightness: an inner cone of light called the
umbra, and an outer cone called the penumbra. Similar to Point lights, Spot lights
attenuate over distance.