Our schema allows the transfer of attributes such as “width” and “color” into Unreal Engine, along with “guide” attributes that are identified for the simulation of interpolated hairs. We provide a naming convention based schema, which facilitates the import of static grooms from DCC applications like Ornatrix, Yeti, and XGen into Unreal Engine, and offers a straightforward pathway to tie in with proprietary studio hair tools. Unreal Engine 4.24 focuses on hair rendering and simulation with easy integration into an existing pipeline using the Alembic file format. This hair groom was rendered with our multi-scattering approach to generate a more realistic look. Unreal Engine 4.24 introduces a full hair shader and rendering system with multiple scattering from light sources, ray-traced shadows and dynamics integration using visual effects editor Niagara. With our new strand-based workflow, each individual strand of hair is rendered with accurate motion, resulting in dramatically improved visual quality. The time has come for first-class real-time hair and fur implemented natively in Unreal Engine. NVIDIA HairWorks helped move the conversation forward, but its official support ended back with Unreal Engine 4.16. This approach was the best option back then even with its tradeoffs for achieving fine-strand detail, accurate shading, and physically-based simulation. While our Siren showcase was a breakthrough when it debuted in 2018, her virtual hair leveraged a traditional card-based technique, relying on textured meshes to give the approximate shape of a much larger number of individual hairs. This effort continues in 4.24 with a new feature we are proud to launch: real-time hair rendering and dynamic support in Unreal Engine.
With 4.22 and 4.23, we took a quantum leap forward with the introduction of real-time ray tracing with accurate reflections and soft shadows. In the 4.20 release, we focused on skin and eyes through lighting and subsurface scattering enhancements.
Over the years, Epic has been committed to providing industry-leading tools and capabilities for studios of all sizes to craft beautiful and believable characters. By Charles de Rousiers, Gaelle Morand, and Michael Forot Each release of Unreal Engine in recent memory has included improvements to advance the creation of the most photorealistic real-time digital humans possible.
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