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GDC 2022 Session Viewer

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Advanced Graphics Summit: Real-Time Ray Tracing in 'Hitman 3'

Alessandro Dal Corso  (Senior Render Programmer, IO Interactive)

Location: Room 3007, West Hall

Date: Monday, March 21

Time: 1:20 pm - 1:50 pm

Pass Type: All Access Pass, Summits Pass - Get your pass now!

Topic: Programming

Format: Session

Viewing Experience: In-Person

Vault Recording: Video

Audience Level: No

In this talk, Alessandro Dal Corso presents challenges and details of implementing ray tracing in HITMAN 3. The talk showcases two main techniques, ray traced reflections and sun shadows at different quality levels.

The presentation first covers adapting a rasterization-based engine into doing ray tracing work. Then, it continues on how to efficiently generate intermediate vertex buffers and build bottom level accelerations, both for simple and complex geometry. It provides details on how to adapt a complex node-based material system to work as ray tracing shaders.

The talk finally present and implementation of ray traced sun shadows, with improvements in penumbra and contact hardening. It also discusses some of the scheduling challenges that ray traced shadows bring in running them together with the reflections.

Takeaway

After this presentation, the audience will get some insights on the challenges of adding ray tracing to and existing engine, in particular one that uses a node based material system.

Intended Audience

The intended target audience for this talk is render programmers interested in the field of real-time ray tracing.