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Use the GDC 2021 Session Viewer to browse and sort the ever-growing list of sessions by day, time, pass type, topic, and format. All registered attendees will be able to build their personal schedule directly within the event platform, once live early July 2021. All times are listed in Pacific Time.

Model Collision: Balancing Speed and Size in 'Black Ops Cold War'

Andrew Shurney  (Lead Software Engineer, Activision: Central Tech)

Date: Friday, July 23

Time: 8:30am - 9:30am

Pass Type: All Access Pass, Core Pass

Topic: Programming

Format: Session

Vault Recording: Video

Audience Level: N/A: I prefer to present live on-site but I am open to delivering a virtual presentation

With the promises of infinite system memory and disk bandwidth devoured by 4k assets, it is once again beneficial to balance performance against utility and memory footprint. Occasionally, however, by taking advantage of ubiquitous hardware features and paying close attention to your data bit by bit, gains can be made on both fronts. This session is a highly technical deep dive into the process of optimizing the high-accuracy model collision in Call of Duty: Black Ops Cold War to reduce memory footprint to less than one-fifth it's size while simultaneously conferring a two-fold speed increasing.


Attendees should leave this talk with ideas for optimizing their triangular collision representations as well as a better understanding in general of making good use of every available bit with respect to alignment and hardware constraints.

Intended Audience

Collision programmers are the primary audience with backend engineers also obtaining some useful information in terms of in-memory database representation. Only a basic understanding of linear algebra, bit manipulation, and SIMD code is required.