When using the Preintegrated Skin Shading Model, you have access to the following inputs: In the image below, the character's flesh uses the Preintegrated Skin Shading Model. While not physically perfect, this Shading Model often gives nice results for human skin with better performance than the Subsurface method. The Preintegrated Skin Shading Model is very similar to the Subsurface model, but prioritizes lower performance cost while sacrificing some accuracy.
When using the Subsurface Shading Model, you have access to the following inputs: In the Ice Elemental below, a dark blue-green color (with a variety of calculations based on lighting) is used to give a sense of translucent depth to the surface.įor more information, see the Subsurface Shading Model documentation. When light scatters through the surface, the Subsurface Color becomes visible.įor human skin, you can often get good results using a dark red color, which simulates blood circulating beneath the surface. This input defines the color of the matter just beneath the surface of the object. The Subsurface model (as well as the Preintegrated Skin model described below) relies on the Subsurface Color input. Subsurface scattering is readily apparent on objects such as ice, wax candles, and skin. This is a real-world phenomenon in which light penetrates a surface and then diffuses throughout it. The Subsurface Shading Model simulates the effect of subsurface scattering. When using the Default Lit Shading Model, you have access to the following inputs: This shading model makes use of direct and indirect lighting, as well as specularity for reflections. When using the Unlit Shading Model, you have access to the following inputs:ĭefault Lit is the default shading model and is likely the one that you will use most often. Emissive Materials can cast light into the scene if Lumen is enabled, or with Lightmass when Use Emissive for Static Lighting is turned on. It appears to illuminate, but no lighting or shadows are cast by this object. Instead, its high Emissive value results in a glow effect, which is also picked up by the dirt mask applied to the camera. Note that in this example, the Material is not casting light into the scene. The Unlit Shading Model only outputs Emissive for color, making this perfect for special effects such as fire or any light emitting object. For example, the Clear Coat, Hair, and Cloth Shading Models are tailored to provide natural results for those specific types of Materials. Unreal also includes Shading Models designed for specific surface types. For instance, the Default Lit Shading Model is a general purpose model you will likely use for most of your surfaces. Unreal Enigne has many Shading Models designed to achieve specific looks for the Materials you set up. Or, put another way, it controls how the input data that makes up the Material is used to create the final look. Shading Models control how your Material reflects incoming light.
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