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This scene has 5 point lights, one sphere and a back plane. Note the shadows created by the lights. Simple
point lights have infinite intensity, so no matter how far
away an object is from the light, it still gets lit the same. Download
the scene and
camera files here SCENE and CAMERA |
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These are similar to point lights, except thier intensity is reduced by the inverse square of the distance
between the intersection point and the light. The area in the middle of the back plane is more bright than the
corners. It's tough to get the intensity right for these types of lights. Download the scene and camera files here SCENE and CAMERA |
 
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The shadows created by point lights are sharp, but with area lights soft shadows begin to appear.
Unfortunately, rendering scenes with area lights is costly. My current implementation of rectangular area lights is
not 100% correct, but it's good enough to get soft shadows. Take a look at the time comparisons between scenes
rendered with different numbers of samples. Download the
scene and camera files here SCENE and CAMERA
| Samples |
Time |
| 10 |
1.28s |
| 50 |
4.76s |
| 200 |
17.77s |
| 1000 |
87.02s |
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