[2017 GDC] Radeon ProRender and Radeon Rays in a Gaming Rendering Workflow
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This document discusses how AMD's Radeon ProRender and Radeon Rays technologies can be used in gaming rendering workflows. Radeon Rays is a GPU-accelerated ray tracing engine that can be used for lightmapping and global illumination calculations. Unity was integrated with Radeon Rays to enable faster lightmap baking. Radeon ProRender is a path tracing renderer that can provide interactive global illumination for content creation, though it is not fast enough for real-time game rendering.
![P O L A R I S T E C H D AYP O L A R I S T E C H D AY
Using Unity’s lightmap G buffer rendering functionality
World position
Surface normal
These are enough to do AO computation
Primary rays are generated by cosine weighted sampling
Makes the integration simple (simply count without any PDF
computation)
AO is calculated as
1 – [# of occluded rays] / [# of casted rays]
1 – sum( weight( hit distance ) ) / [# of casted rays]
Ambient Occlusion Mode](https://image.slidesharecdn.com/2017gdcrprrr-170303185636/85/2017-GDC-Radeon-ProRender-and-Radeon-Rays-in-a-Gaming-Rendering-Workflow-20-320.jpg)
[2017 GDC] Radeon ProRender and Radeon Rays in a Gaming Rendering Workflow
- 1. P O L A R I S T E C H D AYP O L A R I S T E C H D AY Radeon ProRender and Radeon Rays in a Gaming Rendering Workflow Takahiro Harada, AMD 2017/3
- 2. P O L A R I S T E C H D AYP O L A R I S T E C H D AY Introduction Radeon ProRender & Radeon Rays Radeon Rays Unity + Radeon Rays Integration to real time applications Radeon ProRender Agenda
- 3. P O L A R I S T E C H D AYP O L A R I S T E C H D AY Introduction
- 4. P O L A R I S T E C H D AYP O L A R I S T E C H D AY Ray Tracing Solution from AMD A GPU accelerated ray triangle intersection engine For low level engine developers OpenCL, Vulkan, C++ backends Full open source A GPU accelerated light transport simulator Computes global illumination using Monte Carlo ray tracing (path tracing) Intersection, shading, lighting, sampling, all in High level API Set up a scene, call render() Returns you a nice render For high level engine developers OpenCL, C++ backend Open source planned
- 5. P O L A R I S T E C H D AYP O L A R I S T E C H D AY Not locking users to AMD platform Trying to make it run as many platforms as possible Using OpenCL 1.2, industry standard API We implement at least GPU optimized OpenCL code CPU optimized C++ code better control, optimization compared to relying on OpenCL to run on the CPU Our solutions are competitive if compared on a CPU based solution As OpenCL is dynamically loaded, OCL isn’t necessary If it cannot find OCL, it’ll fall back to the CPU implementation Most likely they run on your machine as they are AMD’s Approach
- 6. P O L A R I S T E C H D AYP O L A R I S T E C H D AY Support multiple vendors, multiple OSes (Windows, Linux, MacOS) No initial investment is necessary to use our solution It does run on CPU too If you have an AMD GPUs, it is better Better performance Better experience We do full testing on AMD GPUs Non AMD platforms, it depends on the vendor’s OpenCL implementation We do crash test on some vendor’s GPUs We disable some vendor’s GPUs unfortunately because of their OpenCL bug (compiler, runtime) AMD’s Approach
- 7. P O L A R I S T E C H D AYP O L A R I S T E C H D AY How Radeon Rays, Radeon ProRender are used in game development process This Talk
- 8. P O L A R I S T E C H D AYP O L A R I S T E C H D AY Radeon Rays
- 9. P O L A R I S T E C H D AYP O L A R I S T E C H D AY Can be used as a building block of a renderer Global illumination renderer Sound renderer (True Audio) AI Comes with a reference renderer It could be used for lightmap baking and light probe calculation Uses ray casting There are a few game companies integrating Radeon Rays We integrated Radeon Rays into Unity Radeon Rays h"ps://github.com/GPUOpen-LibrariesAndSDKs/RadeonRays_SDK/
- 10. P O L A R I S T E C H D AYP O L A R I S T E C H D AY Simple C++ API // Find closest intersection! void QueryIntersection(Buffer const* rays, int numrays, Buffer* hitinfos, ! Event const* waitevent, Event** event) const;! // Find any intersection.! void QueryOcclusion(Buffer const* rays, int numrays, Buffer* hitresults, ! Event const* waitevent, Event** event) const;! Passing an array of rays and number of rays It fills hit results Using Radeon Rays
- 11. P O L A R I S T E C H D AYP O L A R I S T E C H D AY Embree is popular, but using Radeon Rays gives you more With Radeon Rays It uses Embree for the CPU backend => Same performance is guaranteed You can turn on the GPU backend => Performance improvements when you have a GPU Using Radeon Rays
- 12. P O L A R I S T E C H D AYP O L A R I S T E C H D AY Unity + Radeon Rays
- 13. P O L A R I S T E C H D AYP O L A R I S T E C H D AY Lightmap is a solution for global illumination Global Illumination is Essential to get realism Computationally expensive Real time global illumination is still a research topic No obvious solution using rasterization yet Global Illumination
- 14. P O L A R I S T E C H D AYP O L A R I S T E C H D AY
- 15. P O L A R I S T E C H D AYP O L A R I S T E C H D AY
- 16. P O L A R I S T E C H D AYP O L A R I S T E C H D AY Monte Carlo ray tracing is a way to compute global illumination Too computationally intensive for game runtime GPU accelerated ray tracing is a hot topic these days Still not ready for real time game Potential in content creation (Radeon ProRender) Lightmap is solution for real-time global illumination Global Illumination
- 17. P O L A R I S T E C H D AYP O L A R I S T E C H D AY Lightmap Many games today uses lightmaps Lightmap Texture storing global illumination Although there are some limitations, it’s widely used Precompute global illumination Ray traced global illumination Saved in texture “lightmap” At runtime, simply put it as a texture, fetch it The precomputation takes forever for a complex game scene Hours to days Radeon Rays can help you from this pain
- 18. P O L A R I S T E C H D AYP O L A R I S T E C H D AY A fast lightmap baking solution Runs on GPU 10 – 20x performance improvement Before 1 day baking => 1 hour with Radeon Rays Faster solution => Faster iteration => Better content creation Lightmap Baker using Radeon Rays
- 19. P O L A R I S T E C H D AYP O L A R I S T E C H D AY Collaboration of Unity & AMD Implemented in a branch of Unity 5.X Based on the existing CPU lightmap baker Using infrastructure for lightmap baking in Unity The logic needs to be changed to fill the GPU better Before: for each lightmap, for each texel, execute After: for each lightmap, execute all the texels in the lightmap in parallel Implemented 2 modes Ambient occlusion and Global illumination Unity Lightmap Baker using Radeon Rays
- 20. P O L A R I S T E C H D AYP O L A R I S T E C H D AY Using Unity’s lightmap G buffer rendering functionality World position Surface normal These are enough to do AO computation Primary rays are generated by cosine weighted sampling Makes the integration simple (simply count without any PDF computation) AO is calculated as 1 – [# of occluded rays] / [# of casted rays] 1 – sum( weight( hit distance ) ) / [# of casted rays] Ambient Occlusion Mode
- 21. P O L A R I S T E C H D AYP O L A R I S T E C H D AY AO ray doesn’t bounce, but it does in GI Maximum bounces is a user defined parameter Ray termination Supported light types Point light Spot light Directional light Area light Emissive shader IBL Global Illumination Mode
- 22. P O L A R I S T E C H D AYP O L A R I S T E C H D AY Surface properties are filled at lightmap G buffer rendering stages World position Surface normal (with normal maps) Diffuse albedo Necessary for color bleeding Emission View dependent effect are ignored glossy, specular reflections Global Illumination Mode
- 23. P O L A R I S T E C H D AYP O L A R I S T E C H D AY for lightmap in lightmaps! ray = generatePrimaryRay( lightmap )! for bounce < maxBounce! hit = RR::intersect( ray )! // emissive! texel += evaluateEmissive( hit )! // ibl! shadowRay = generateRayIBL( hit )! shadowHit = RR:intersect( shadowRay )! texel += evaluateIBL( hit, shadowHit )! for light in lights // point, spot, directional! shadowRay = generateRayLight( hit, light )! shadowHit = RR:intersect( shadowRay )! texel += directIllumination( shadowHit, light )! ray = generateNextRay( ray, hit ) Global Illumination Mode
- 24. P O L A R I S T E C H D AYP O L A R I S T E C H D AY 288k Tris 497k verts Directional lights Point lights Radeon Rays 160-170MRays/s (a few sec for IBL + emissive) Existing CPU code <10MRays/s Lightmap Visualization
- 25. P O L A R I S T E C H D AYP O L A R I S T E C H D AY GI + Texture Final Render
- 26. P O L A R I S T E C H D AYP O L A R I S T E C H D AY This project is still in progress We are going to improve to make it Robust Better convergence Progressive rendering, so that it can run async with other work A big advantage over CPU Finally
- 27. P O L A R I S T E C H D AYP O L A R I S T E C H D AY Other Radeon Rays Adaptions
- 28. P O L A R I S T E C H D AYP O L A R I S T E C H D AY Real-time rendering plugin for Autodesk Revit Exploring the model with high quality rendering Use of custom fork of Radeon Rays
- 29. P O L A R I S T E C H D AYP O L A R I S T E C H D AY Real-time rendering plugin for Autodesk Revit Exploring the model with high quality rendering Use of custom fork of Radeon Rays Radeon Rays is used to compute illumination caches Hybrid global illumination solution Hierarchy of illumination caches Screen space ray tracing World space ray tracing as a last resort BVH streaming
- 30. P O L A R I S T E C H D AYP O L A R I S T E C H D AY Radeon Rays integration Some game studios Radeon Rays integration is not for everybody If you don’t need the fine control in baking, Radeon ProRender might be the solution for you Radeon ProRender has not only ray intersection, but all the logic necessary for GI (shading, sampling etc) are there You only need to set up the scene and call rprContextRender() Lightmap render Light probe render Interactive preview Others and More
- 31. P O L A R I S T E C H D AYP O L A R I S T E C H D AY Radeon ProRender
- 32. P O L A R I S T E C H D AYP O L A R I S T E C H D AY A workflow where we bake, apply, then you can see global illumination Could be wasteful Texture resolution is too high Could be insufficient Texture resolution is too low Optimal sampling rate is difficult with lightmap solution Interactive global illumination solution with Radeon ProRender is alternative Single click “Render” Simpler workflow Progressive global illumination refinement What I have talked about are
- 33. P O L A R I S T E C H D AY MARCH 2016 | FIRERENDER, FIRERAYS Render Examples
- 34. P O L A R I S T E C H D AYP O L A R I S T E C H D AY VRay Material Converter
- 35. P O L A R I S T E C H D AYP O L A R I S T E C H D AY VRay Material Converter
- 36. P O L A R I S T E C H D AYP O L A R I S T E C H D AY https://www.youtube.com/watch?v=z9wArygtwlI Radeon ProRender Demo
- 37. P O L A R I S T E C H D AYP O L A R I S T E C H D AY A fast GPU accelerated global illumination renderer Not fast enough for game runtime There is a potential in game content creation acceleration Provided as SDK for developers (C API) Plugins for creators Radeon ProRender is
- 38. P O L A R I S T E C H D AY MARCH 2016 | FIRERENDER, FIRERAYS Features } Camera 360 PerspecRve VR } Geometry Instancing Mesh Subdivision } Lights Area IES Spot Point
- 39. P O L A R I S T E C H D AY MARCH 2016 | FIRERENDER, FIRERAYS Features MATERIALS } BSDFs } Basic components Diffuse reflecRon } Shader graph } Arbitrary connecRon of shader nodes for flexible shading system Diffuse refracRon Glossy reflecRon Glossy refracRon Spec. reflecRon Spec. refracRon SSS Input Lookup ArithmeRc Procedural Example Example Example Blend BSDFs
- 40. P O L A R I S T E C H D AYP O L A R I S T E C H D AY Radeon ProRender Plugins From AMD From third party 3DS Max Maya Solidworks Blender Coming soon!!
- 41. P O L A R I S T E C H D AYP O L A R I S T E C H D AY Portal Displacement mapping CPU + GPU VRay Material Converter 3DS Max Plugin New Features
- 42. P O L A R I S T E C H D AYP O L A R I S T E C H D AY Portal Displacement mapping CPU + GPU VRay Material Converter 3DS Max Plugin New Features
- 43. P O L A R I S T E C H D AYP O L A R I S T E C H D AY Portal Displacement mapping CPU + GPU VRay Material Converter 3DS Max Plugin New Features
- 44. P O L A R I S T E C H D AYP O L A R I S T E C H D AY Thanks to Nicholas Timmons, Dmitry Kozlov for Unity integration Acknowledgement