Night No Lights Scene Lighting

An overview of the Night scene from the Realistic Rendering demolet included with UE4.

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There are 4 types of lights in use in the night no lights scene.

  1. Directional Light Stationary - Provides the moonlight for the scene, seen primarily on the balcony.

  2. Spot Light Static - These are placed just outside the window and simulate soft light entering the room from ambient sources.

  3. Spot Light Stationary - These are placed within the lamp in the corner, simulating light exiting the top and bottom of the lamp shade. Another is used to create a cone of light from the flashlight on the floor.

  4. Point Light Movable - These are grouped to the flashlight that lies on the floor. They simulate light bouncing from the flashlight.

Setup Considerations

This level plays a little differently from the other two. Instead of a cinematic sequence, the player moves around the room with a floating flashlight.

IES Profiles

Above the picture frames in the room are a few artificial lights. These are Stationary Spot Lights that make use of IES Profiles, which provides the banding and shape of the light. IES profiles define a shape of a light as it leaves a physical fixture or bulb. These are the same profiles used by photometric lights in 3D animation packages, and the profiles themselves can be downloaded from light manufacturer websites such as Phillips and GE .

IES Profiles



IES Profile in Content Browser

IES Profile Result

Inverse Squared Falloff

These lights also use Inverse Squared Falloff, which is a setting found in the light's Details panel under the Light Advanced category.


This is a realistic calculation of how fast light falls off as it escapes its source. Incidentally, this is also a very fast falloff rate, requiring the light radius to be high. This is important to keep in mind, as there is currently a limitation of no more than 4 shadowing stationary lights overlapping at one time. When boosting light radius to compensate for inverse squared falloff, it is easy to make several lights that overlap.

For more information, please see the Stationary Lights documentation.

The 4-light limitation is particularly pertinent in this level, as the player is carrying one of those lights (the flashlight). This means the level had to be crated in such a way that no more than three shadowing stationary lights were overlapping anywhere that the flashlight could be shone.

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