We will use traditional three-point lighting, which consists of a key light, a fill light, and a rim (or back) light. For our example, we’ll illuminate a simple object to clearly show how each light contributes to the final image. In this image taken in Rhinoceros 3D, the key light (A) is a rectangular light, the fill light (B) is a spotlight, and the rim light (C) is a point light. They are arranged in a rough triangle around the model, positioned far enough away to stay out of the frame while still providing full illumination.

We’ll start with the default lighting settings. At this stage, the model appears mostly dark, lacking clarity and dimensionality.

Turn on the key light first. This is the primary light source and establishes the dominant direction of light. It should be the brightest of the three. A rectangular light works well for this because it provides diffuse, broad lighting.

Next, activate the fill light. Its purpose is to extend the illumination created by the key light to the dark side of the model. It serves as a secondary light source. A spotlight is used because it creates a direct, targeted light.

Finally, turn on the rim light. This light helps separate the model from the background by outlining its back edge. A point light works well as a rim light because it emits light in all directions, illuminating everything behind the subject.

Walking through each light individually demonstrates the role each one plays in the three-point lighting set up. While the types, position, intensity, and number of lights may vary depending on the model, three-point lighting is a reliable starting point for producing realistic, compelling renders. It helps you effectively communicate your design and gives clients a more lifelike preview of the final piece.