Lighting and rendering technology for an advanced custom graphics engineShipped Title: Red Dead Redemption 2 (PS4 and Xbox One).• Implemented Physically Based Rendering (PBR) shader pipeline based on the most recent graphics research.• Developed artist-placed reflection probe tech for more accurate reflection and lighting in PBR pipeline.• Substantially improved the LOD lighting system for both indoor and outdoor lights visible at great distances.• Developed vehicle lighting system that allows in-game authoring of lights easily for many vehicles at the same time. Substantial work optimizing lighting for moving interiors (trains, for example).

Graphics tools and technology for a new startup game studio using Unreal Engine 4. Expanded into gameplay tasks as the need arose.Project: Blunderbuss - third person team-based action game.• Wrote shaders and gameplay logic to implement post processing and special effects.• Gameplay features for target selection.• Helped define technical budgets for Art team as well as the target min-spec for the game.• GPU performance profiling and optimization on PC hardware

My primary focus is to develop high-end rendering capabilities for a cross-platform third person shooter MMO.Shipped Title: Defiance (Xbox 360, PS3, PC)• Rewrote most of the shadow map implementation to use higher quality, yet less expensive filtering techniques. Heavily optimized lighting shaders to avoid any branching during shadow mapping in large scenes.• Depth of Field-- Used Edge Post (PS3 SPU's) to update DoF implementation to selectively blur only portions of the screen as requested by Art.-- Updated console blurs to more closely mimic the more expensive PC blurs by sampling along texel boundaries to leverage hardware bilinear filtering to get more blur taps for "free".• Wrote very fast, custom renderer to draw graphics to the screen as quickly as possible during game start up to satisfy TCR/TRC requirements.

Designed and implemented large portions of Monolith's cross-platform (Xbox 360, PS3, and PC) rendering engine. Worked closely with technical artists and lighting artists to give them the tools and features they need to make great-looking, high-performing content.• Replaced traditional forward renderer first with a light-prepass and then a fully deferred renderer.• Extended and modernized proprietary shader compiler to support multiple render targets and the decoupling of techniques from the engine runtime along with other features.• Replaced stencil volume shadows with brand new shadow mapping solution supporting different filtering techniques.• Implemented video playback system to work across multiple threads while feeding information back into the game thread when necessary.

Developed high-performance, cross-platform rendering algorithms for Aliens RPG (canceled after 2+ years in development) within Obsidian’s proprietary engine (Xbox 360, PS3, and PC).• Implemented GPU Skinning on all platforms through the use of vertex textures on the PS3, Xbox360 and PC systems.• Designed and developed a Screen-Space Ambient Occlusion Algorithm.• Implemented a deferred shadow map system along with different filtering algorithms to use it with (ESM, Parabolic, and CSM).• Designed systems from scratch taking into account the strengths of each console and adapting the architecture to meet those strengths.• Wrote memory tracking code to produce reports to track memory usage over the project lifecycle.

Worked on DirectX documentation. Focused mainly on Direct3D 9 and 10 with emphasis on resource manipulation and performance.

Rendering technology and tools for Xbox 360 version of Madden Football.

Part-time work doing research on Higher Order Surfaces and non-graphics applications of the GPU (mainly image processing pixel shaders).

Worked on diagnostic OpenGL display drivers for proprietary hardware.