Night Scene Lighting

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

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RoomNight.png

There are 3 types of lights in use in the night 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 ambient light bouncing throughout the room.

  3. Spot Light Stationary - These are placed above the picture frames in the room, and more are placed within the lamp in the corner, simulating light exiting the top and bottom of the lamp shade.

Setup Considerations

The Night scene (RoomNight.umap) is similar to the Daylight scene. The Stationary Directional Light provides additional lighting, as if from a moon or street light. Here you can see the balcony both with and without this light:

Moon Directional Light On

Moon Directional Light Off

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

IESProfile.png

IESResult.png

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.

InverseSquaredFalloff.png

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.

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