János Turánszki
@turanszkij
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Developer of Wicked Engine. Previously at PlayStation Devtech and Neocore Games. El. Psy. Kongroo.
Joined July 2009
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I'm trying to take Wicked Engine to the next level, so created a Patreon page where people can support the project:
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A simple way to draw anti aliased geometry. It doesn't require using MSAA or any shader trickery, just good old alpha blending and vertex colors:
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A combination of CPU and GPU physics: CPU for the falling capsules and collision with terrain (Bullet physics), and custom GPU colliders for colliding with grass particle system.
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If you want to render a cube without normals, uvs or anything, I really like the following hack: draw a 14-vertex triangle strip and use the following code in the VS. Really useful for decals, envprobe proxies, occludees, etc. I didn't come up with it:
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Trying to implement SSGI (Screen Space Global Illumination) in Wicked Engine:
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When you are developing graphics on Nvidia GPU, you can easily do something that looks correct, but breaks on AMD. These are the things that even the debug layer cannot validate:
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First look at Dynamic Diffuse Global Illumination (DDGI) in Wicked Engine:
(DX12, Vulkan, software and hardware raytracing implementations)
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Simple water ripple effect can be created by blending normal map sprites together:
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Finally, Vulkan video works in Wicked Engine! Videos can be added to any object in the scene. Lots of HD videos can be decoded in real time at once:
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Removed DX11 from Wicked Engine, to allow more efficient use of Vulkan and DX12. Lots of rewrites to make use of bindless, persistent mapping, visibility buffers and more. Surfel GI is also in. And leaving some path traced renders here:
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Extending point lights in Wicked Engine with a radius and length. Ray traced shadows with AMD denoiser:
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Sparse textures on terrain surface. Chunks close to the camera use up to 16k * 16k texture resolution (1 chunk = 64*64 meters). But the texture memory usage is reduced (< 256 MB), because only those parts are allocated which the GPU uses.
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The voxelized scene for path finding can also be used for character occlusion testing:
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Read below how you can create progress bar animations with using a gradient image like this:
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Wrote a new blog post: Improved normal reconstruction from depth
Mainly used this technique to improve SSAO, check it out:
#gamedev
#graphics
#programming
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I added stars to the sky. They are created by a per pixel gradient noise:
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Virtual textures updated to support 64k * 64k resolution close to camera. Now it uses texture atlas based on Far Cry 4 presentation. Sparse mapping is no longer updated per frame, but only used for aliasing, to write block compressed textures. Textures use max 340 MB memory.
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Searching for cover in voxel path finding, debugging view:
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Wicked Engine now supports the emitted particle systems in all raytracing effects. Some images from path tracing renderer:
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I'm working on sparse texture for terrain (megatexture). GPU can request tiles for specific mip levels to be mapped/unmapped. Adding these debug visualizers was a must. Works in Vulkan and DX12, now I will need to scale it up and optimize.
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Completely rewritten for the rain effect since last video as a particle system (previously it was a scrolling noise). Now it also generates splashes for each particle that hits an object:
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200 dynamic point light shadows in Sponza:
I changed the shadowmap storage from texture arrays to an atlas, so each light can have dynamic resolution shadow. Also, there is no separate texture for cubemaps any more, they are packed with the others.
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Running through Sponza with many shadow casting lights. Read about some tricks below that Wicked Engine uses to render lots of dynamic shadow maps:
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Volumetric lights with transparent shadow maps, read below how they are rendered:
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Wicked Engine is coming to Steam on September 1:
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I'm testing voxelization on CPU, want to use it for path finding:
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Breakdown of how my SSGI was rendered:
1) Depth and light buffer are downscaled and de-interleaved into multiple resolution texture arrays. Each resolution has 16 layers containing sample information of a higher resolution. Normal buffer is downscaled into just mips.
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Improved fog now works consistently with the sky and clouds. Volumetric clouds can also receive shadows now. This is Wicked Engine's weather system upgraded by Kliaxe:
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You can notice that the image is made up of two triangles if you focus on the distortion on the left. It is caused by UV interpolation in hardware, and you can fix this by computing UVs in the pixel shader instead. This blog by Nathan Reed describes how:
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Added multi-scale mean estimator to DDGI (also used in surfel GI), this makes it faster react to lighting changes. And now it also uses real-time BC6 compression.
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Fighting game in Sponza:
(Haven't tested much with two players, the handling is awkward)
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The grass particles look pretty nice with raytraced ambient occlusion and shadows:
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The voxelized path finding in Wicked Engine supports ground and air traversal:
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After 3 days of matrix multiplication order hell, managed to implement animation retargeting. Works with humanoid rigs that have different proportions and sources (Mixamo animation to VRM model):
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Added better directional irradiance to surfel GI, and it's compressed to BC6 in real time. The bottom shows a debug view:
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Added support for OpenImageDenoise 2.0 GPU API to Wicked Engine (path trace, lightmaps). The new GPU denoiser is a lot faster than the CPU one. It required one API change, to upload and download image data using oidn::BufferRef instead of raw pointers.
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Diffuse GI with surfels (WIP)
After much tweaking, still too much noise and performance could be better, but starting to look good.
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Updated FPS sample for Wicked Engine now has enemy logic:
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I think I've found the worst example ever for water refraction shader. I like this game, but come on. :D
So I thought I describe quickly how to fix it:
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It's a rainy day in Sponza. I'm trying to create a rain effect in Wicked Engine:
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After 5 years, I'm updating the voxel GI in Wicked Engine again, adding anisotropic voxels and clip maps. Not complete yet because the performance is awful, but it works now:
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Wrote a new blog post to start the year: Tile-based optimization for post processing. I hope someone will find it useful.
#gamedev
#graphics
#programming
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Terrain generation is not very good at large scale yet. Current solution is simply uniform sized chunks in a hash map. I would like to have planet sized terrain next.
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Thread on how to create this stencil highlight effect:
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Even with the dynamic DDGI probe offsets, sometimes they can get stuck in closed tight spots. Now if the scene has a voxelization, the probes can use it to unstuck themselves into the nearest empty voxel:
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In the Unity controversy some people are finding out about Wicked Engine in search of a new engine. Here is a little highlight showcase, and a thread of how Wicked Engine is different to Unity:
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Last year I did a BVH builder on GPU, here are some timings (DX11, GTX 1050):
- City (94K tris): 2.6 ms
- Sponza (262K tris): 9.4 ms
- Living room (580K tris): 14 ms
- Lumberyard Bistro (3.8M tris): 102 ms
How to implement BVH building on GPU:
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New blog is out: Entity-component system
- simple implementation
- data oriented design
- scene graph use case
- serialization
#gamedev
#programming
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I released 3 presentations from the development process of Surfel GI in Wicked Engine (inspired by Pica-Pica tech demo). They were made for the D5 Render company who was sponsoring the experiment last summer:
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You can read my new blog about Vulkan video decoding here:
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Added a little bending to the grass by camera up vector. This helps when looking at the billboards from above:
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This shows how the opening doors open a walkable pathway for NPCs by re-voxelizing the scene, and also they don't get stuck on tight paths inside the house.
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Started a new FPS sample for Wicked Engine. Managed to put in everything that I planned in a weekend's work:
- keyboard and controller support
- hard coded weapon animations
- movement, crouching, jumping
- muzzle flash particle system
- aim down the sights
- bullet holes
- sound
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I created a very simple DDS image writer for C++. Single header, no dependency, supported image types:
- Texture1D
- Texture2D
- Texture2DArray
- TextureCube
- TextureCubeArray
- Texture3D
- mipmaps
- any DXGI format
No legacy, only compatible with DX10+.
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Surfels remember their primitive ID and barycentrics, so they can stick to dynamic geometry. I used a triangle visibility buffer and bindless descriptors to implement it.
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Variable Rate Shading is now available in Wicked Engine (DX12 mode). Shading resolution can be reduced for materials, particle systems, and screen space velocity. It was surprisingly painless to implement. As always, implementation on Github:
#gamedev
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Adding material paint support for the terrain virtual texture system. It can use "unlimited" amount of layers:
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Last week someone by the username Kliaxe dropped in an upgraded Screen Space Reflections implementation to Wicked Engine. It is based on the Siggraph 2015 presentation "Stochastic Screen Space Reflections".
Slides:
Wicked Engine:
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After some refinements and fixes, the path simplification can avoid these harder cases like short turns around corners, or long path smoothed too much near a wall. I think I'm done with this debug scene.
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Testing a method to blend objects into the terrain surface. This allows the terrain virtual texture and height to be sampled at pixels' world position and blended in to the object's texture. The terrain normal is computed from the height and also blended with the object normal.
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I created this procedural terrain generator in Wicked Engine:
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My first time implementing path finding, this is the A* algorithm on the dynamically voxelized scene in Wicked Engine:
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I created a new blog post about vertex buffers, focusing on different formats and packing:
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Upgraded Wicked Engine's profiler with this little graph recently. Makes it very obvious to spot performance spikes compared to just listing the times:
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Experimented today with volumetric cloud parameters in Wicked Engine
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Wicked Engine now works on the PlayStation 5!
Also a big website update:
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Managed to improve the performance and quality of SSGI. Now it doesn't use dithering, but a wider uniform sampling. Also caching more stuff in groupshared memory. Still have to apply too much blur, so sadly much of the shape of shadows is lost. But pretty stable in motion now.
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The number structures you need to create for decoding H264 video in Vulkan vs. DX12:
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My former colleague, single-handedly developing a realistic racing simulator with his own engine (using DirectX 8 for graphics!). Very much worth a follow.
Dealing with track recovery for a few days now. I added some debug keys to take over AI vehicles so I can ruin their control, or just set up unwanted situations. Not always perfect, but it's kinda ok for my hobby game :)
#gamedev
#IndieGameDev
#simulator
#hungame
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Pulled some all nighters during the holidays to implement the "scatter-as-you-gather" depth of field and motion blur effects from Jorge Jimenez's Siggraph 2014 talk. Some optimizations are still missing, but I'm happy with the look. :)
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Some improvements to the transparent shadow mapping technique to better handle the volumetric lights. Updated my old blog too:
#gamedev
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Simplification and smoothing the pathfinding result. For every voxel waypoint, DDA line drawing algorithm is used to detect occlusion of upcoming waypoints, this way many of them can be removed. The path is then smoothed by a Catmull-Rom spline.
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My new blog is out: "Thoughts on light culling: stream compaction vs flat bit arrays"
Revisiting forward+ with some neato results, enjoy :)
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Wicked Engine has been released on Steam just now:
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My new blog post just materialized: Simple job system using standard C++ :)
#gamedev
#programming
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Added the FidelityFX denoiser to Wicked Engine (for raytraced shadows and ambient occlusion)
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Needed to debug raytracing in Wicked Engine terrain again. Nvidia Nsight raytracing debugger was very useful. A little fly-through video of using the tool:
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Progress of Wicked Engine's GUI from 2016 to 2022. I'm developing it alongside the rest of the engine, from scratch. Made some big improvements this week:
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