As the three final stages of the 3D animation production phase, 3D VFX, lighting and rendering are closely tied together; among which lighting has a substantial impact. Lighting is one of the most important elements of any visual representation. Lighting in 3D animation is much like lighting in photography or film making. The lighting artist sets up a combination of light sources to either draw attention to a special part of the setting, set the overall mood of the scene or represent the natural properties of the scene such as time of the day.
The role of 3D lighting can be of even more significance in 3D commercials, product visualizations or hyper realistic 3D animations. The lighting artist can significantly bring out various details of the objects; everything looks unappealing and boring without proper lighting.
What is 3D lighting?
3D Lighting is the collection of tools and techniques used to simulate light in a computer-generated 3D environment. 3D Lighting techniques offer a huge amount of flexibility regarding the level of detail and functionality. They also operate at different levels of complexity. Lighting artists can choose from a variety of light sources, effects, tools and techniques that suit their needs.
Just like photography or filming, the lighting stage of the 3D animation pipeline is all about making a 3D scene or sequence visible in a specific way through setting up different sources of light. Lighting is especially important in a 3D animation, because it must support the story, convey the mood of a shot and also visually depict the location, time of day, and even the weather convincingly.
These factors have a much heavier weight when it comes to longer projects. Creating a consistent lighting scheme across the entirety of a 3D feature film or television show is one of the biggest challenges the lighting department of a 3D animation studio will be up to.
Different types of light sources in a 3D environment
The kind of light we see around us in the real world, is in fact a complex combination of ambient light plus different additional light sources. A huge part of the light we see every day is the actual light from a distant burning-star illuminating our sky and bouncing countless times in the environment.That’s why out of direct light, objects are rarely completely dark.
High-end rendering engines, produce high-quality ambient lighting that can create extremely convincing scenes. Standard rendering engines however create a somehow similar effect by adding a lighting value to all the pixels in the image. Global Illumination (GI) and Skydome are two of the most used algorithms used in 3D animation studios like Dream Farm for creating convincing ambient lighting in 3D environments.
Skydome Lighting: Skydome is an effective tool to simulate light from a dome above the scene; representing the sky. It can even be used with HDR images to perform image-based lighting too. Skydome is mostly used for outdoor scenes but can also be implemented for indoor scenes when needed.
Global Illumination: Global illumination algorithms calculate light travelling throughout the entire scene. Such algorithms not only take direct illumination into account, but also calculate indirect illumination in which light rays from the same source are reflected by other surfaces in the scene. Thus, they create a very realistic illumination which pretty much resembles what we see in the real world.
Different types of light sources can be used in combination with these two. Take a quick look at some of them to better understand unique properties and potentials of each; combined with GI and Skydome. Experimenting with these tools and techniques can take you to a point where you can effectively simulate the real world lighting in a virtual environment:
1. Directional Light
A directional light (also known as infinite light) is great for simulating the sun or moonlight, because the light it creates travels in parallel rays; like a far away light source. This light source strikes the polygons in the scene with equal intensity.
2. Point light
Point light (also known as omni light), emits light from a single small point, in all directions. It is often used to create fill light because it has no specific shape or size. The closer the object is to the light source, the brighter it appears. A light bulb is an example of Omni/point lights in real world.
3. Area Light
An area light emits light from a specified surface with a specific shape and size; such as a window, fluorescent light fixture or back-lit panel. In other words, an area light is a physically based light that casts directional rays from within a specified boundary; creating soft and realistic shadows. These properties make it a popular choice in product lighting or architectural visualization. Area lights do have an overall direction, but they don’t emit parallel rays like a directional light.
A very popular category of lights in any 3D animation software is spotlight. A spotlight produces a cone of light in a single direction; with the light getting more intense closer to the source and to the center of the cone. The lighting artist can control the cone angle, determine the size of the light or soften the outside edge of the cone to create different looks. A flashlight is an obvious example of spotlights in real world.
3 Basic lighting techniques in a 3D environment
There are three basic lighting techniques which are widely used in photography, film, theater and painting. These three simple lighting techniques can be applied to a virtual 3D environment as well, to create a basic lighting for 3D animations. However, 3D lighting is not limited to these three techniques and can be much more complicated.
1. Three-point Lighting
Three-point lighting is probably the most common one, which obviously uses three light sources:
- The key light: which is the most intense one among the three and the primary source of light; placed to one side of the subject.
- The fill light: which is less intense, placed on the opposite side of the key light to slightly fill in the shadow cast from the key light.
- The rim light: which is placed behind the object to separate it from the background by adding a highlight around it.
2. Two-point Lighting
Two-point lighting is most similar to what we see everyday: A primary source of light (the sunlight) and a second light surrounding it (sky’s ambient lighting).
3. One-point Lighting
The one-point lighting setup has only one light source without any complementary one to fill the shadows. This is an extreme technique used to create a very dramatic effect.
The job of a 3D lighting artist in an animation studio
Lighting is an important element for any 3D animation. 3D animation lighting professionals are very similar to film lighting artists and artistic painters. They must be able to create a specific mood in a shot or sequence or show every detail of an object by lighting.
The 3D lighting artist is also responsible for the coherence of the lights on each sequence and the whole 3D animation; especially in bigger productions. Once productions reach a certain size, quality and time factors make it impossible for animation studios to produce full projects by 3D generalists. That’s why bigger 3D animation studios diversify their CG workforce into professional teams consisting of dedicated modelers, riggers, animators, texture artists and lighting professionals.
It will be important for a 3D lighting artist to pick a software such as Autodesk Maya and master it. Their knowledge and experience in whichever software they use to light up the characters and sets, should be used to contribute to the 3D animation’s atmosphere. But it won’t be enough. They must understand how light behaves and have a comprehensive knowledge of light, color and how different material or textures work under different types of light.
After all, technique is fundamental for a 3D lighting professional, but artistic sense and creativity are also needed. These qualities combined with adequate practice, make a specialized lighting artist incredibly valuable to any 3D animation studio.
3D lighting is an important aspect of every 3D animation project. This is the process in which the light sources of the 3D environment, shades, shadows and reflections are created. 3D animation lighting is much like photography or film: A combination of light sources to either draw attention to a special part of the setting, set the overall mood of the scene or represent natural properties such as time of the day or even weather.
The next step in the 3D animation pipeline would be 3D rendering. As mentioned before, 3D VFX, lighting and rendering are closely tied to one another and might require multiple revisions to work best together. Therefore it is essential for a 3D animation studio to create a proper relationship between professional teams.
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