Search Unity

  1. Unity 2019.1 is now released.
    Dismiss Notice

Assets GPU Occlusion Culling without baking and raycasting — free demo package is available!

Discussion in 'Works In Progress' started by drcrck, Jan 25, 2019.

?

Price?

Poll closed Feb 22, 2019.
  1. 10

    17 vote(s)
    29.8%
  2. 20

    12 vote(s)
    21.1%
  3. 30

    17 vote(s)
    29.8%
  4. 40

    3 vote(s)
    5.3%
  5. 50

    8 vote(s)
    14.0%
  1. drcrck

    drcrck

    Joined:
    May 23, 2017
    Posts:
    253


    GDOC is a dynamic GPU occlusion culling solution that increases FPS by hiding objects that are not visible by the camera, drastically reducing draw calls.

    Compared to the built-in occlusion culling, GDOC works at runtime and doesn't need baking.

    Features
    — No baking, works with procedurally generated or streamed scenes
    — No raycasting, doesn’t need colliders
    — Supports dynamic occluders and occludees
    — Most of the work is done on GPU
    — Culls shadow casters for 1 directional light
    — Supports LWRP
    — Supports VR multi pass & single pass (non-instanced)

    Testing scene: Viking Village City
    Made from assets from the Viking Village demo:



    MeshRenderers: 111k
    MeshFilter triangles: 670kk
    Particle systems: 18k
    Point lights: 6k (no shadows)

    The scene is generated at runtime, nothing is baked.
    All meshes cast realtime shadows from 1 directional light that moves around the scene.

    Comparison in editor:



    It's not really fair because scene view kills the performance.
    Check out the video to see how it works in builds.


    Requirements
    Supported platforms: DX11 on Windows x64
    Not supported yet: Vulkan, HDRP, Linux/Mac, consoles
    Won’t be supported: OpenGL, Metal, mobile devices

    Best practices
    To achieve the best results with GDOC, make sure:
    1. Scenes are big and have many objects that can be potentially occluded (like in the demo scene)
    2. Objects exist in the scene hierarchy as MeshRenderers or other supported components
    3. You have a Directional Light with realtime shadows
    4. The number of draw calls is high and seems to be the main bottleneck

    You can PM me in case you're not sure if it will work well for your game

    Purchase GDOC on the Asset Store: http://u3d.as/1rYU

    Download demo build:
    https://drive.google.com/file/d/1BIoSZBDR1B0B5TJJTRxal7uptgWFNuCp

    Demo package
    https://drive.google.com/file/d/1dehcHM6Yxdb-MzKLVbxbzQIJSYKWM-WJ
    Note: this package is intended for evaluation purposes only. It has all features of the full version, but also has a watermark and doesn't work in builds

    Join Discord
    https://discord.gg/hMUTyfZ

     
    Last edited: Apr 3, 2019
  2. razzraziel

    razzraziel

    Joined:
    Sep 13, 2018
    Posts:
    66
    tip: you should compare it with Unity defaut oc.
     
  3. drcrck

    drcrck

    Joined:
    May 23, 2017
    Posts:
    253
    Built-in OC doesn't cull shadow casters, so if you have sun with realtime shadows, it's not a competitor
    Check out this screenshot:

    It culls things fine for regular rendering, but does nothing for the shadow pass
    And it leads to 1500+ extra drawcalls that contribute nothing to the final picture

    Same situation but with gDOC (to be named... :D ):

    And you see that all shadows that can't be seen by the camera are disabled 8)
     
  4. Lymdun

    Lymdun

    Joined:
    Jan 1, 2017
    Posts:
    4
    Very interesting, hope to see your OC soon on the store!
     
  5. drcrck

    drcrck

    Joined:
    May 23, 2017
    Posts:
    253
    First post updated with a new demo scene — it has more than 100000 mesh renderers with realtime shadows
     
  6. NUKKschocke

    NUKKschocke

    Joined:
    Oct 17, 2018
    Posts:
    19
    Oh boy have I got a scene to test this out on for YOU. :D
    I'm working on a huge scene for a real world city building project with millions of tris visible almost every frame and full of geometry not optimized for an interactive Unity environment. Our standard baked occlusion culling isn't really doing the best job, we think, so I'm always on the lookout for new solutions.

    I'd love to test this ASAP!
     
    soleron likes this.
  7. Ascensi

    Ascensi

    Joined:
    Sep 7, 2013
    Posts:
    565
    @drcrck does this support Multiplayer/multi cams/display?
     
  8. drcrck

    drcrck

    Joined:
    May 23, 2017
    Posts:
    253
    I'm afraid it can't optimize your scene for you. If baked OC doesn't improve performance, this one can't as well. Can you show some screenshots of your scenes?

    No, it currently supports only 1 non-vr camera. More features will be added later.
     
  9. eaque

    eaque

    Joined:
    Aug 20, 2014
    Posts:
    532
    Hi,

    Great work!
    Is it compatible with something like vegetation studio which already uses gpu ?
     
  10. Firlefanz73

    Firlefanz73

    Joined:
    Apr 2, 2015
    Posts:
    987
    Looks interesting!

    I have a game where the whole world is made of dynamic chunks, which are itself set together to one mesh from voxels, some just cubes others meshes.

    I can either set each chunk to be static, or turn that off and have all materials gpu instanced, both works fine.

    I have a Problem with the Performance (each chunk is 10x10x10 blocks) when viewing distance gets higher, could this help in my case, too?

    I would really like to give it a try if you are unsure and give you Feedback :)
     
  11. drcrck

    drcrck

    Joined:
    May 23, 2017
    Posts:
    253
    No, but I need it too, so I'll add it later

    You can easily test this manually: disable chunks which are inside the camera frustum, but occluded by other objects (i.e. can't be seen by the camera). Are there such chunks? Does disabling improve performance?
     
  12. Firlefanz73

    Firlefanz73

    Joined:
    Apr 2, 2015
    Posts:
    987
    I once tried this myself, but I do not know if I did it right.
    I realized no big change if I do this or not:

    Code (CSharp):
    1.     private void CheckChunksVisible()
    2.     {
    3.         //https://forum.unity.com/threads/check-if-object-is-visible-to-main-camera.462777/
    4.         //https://answers.unity.com/questions/8003/how-can-i-know-if-a-gameobject-is-seen-by-a-partic.html
    5.  
    6.         Plane[] planes = GeometryUtility.CalculateFrustumPlanes(Camera.main);
    7.         foreach (var chunk in ChunkManager.Chunks)
    8.         {
    9.             //if (chunk.Value != null && chunk.Value.FlaggedToUpdate || chunk.Value.FlaggedToRemove) {
    10.             chunk.Value.GetComponent<Renderer>().enabled = GeometryUtility.TestPlanesAABB(planes, chunk.Value.GetComponent<Mesh>().bounds); // oder chunk.ChunkCollider oder chunk.GetComponent<MeshCollider>
    11.         }
    12.     }
    13.  
    In the player's update method:

    Code (CSharp):
    1.             Vector3 screenPoint = Camera.main.WorldToViewportPoint(targetPoint.position);
    2.             if (screenPoint.z > 0 && screenPoint.x > 0 && screenPoint.x < 1 && screenPoint.y > 0 && screenPoint.y < 1)
    3.             {
    4.                 currentGazeTimeInSeconds += Time.deltaTime;
    5.                 if (currentGazeTimeInSeconds >= holdGazeTimeInSeconds)
    6.                 {
    7.                     currentGazeTimeInSeconds = 0;
    8.                     CheckChunksVisible(); // todo Thread? StartCoroutine?
    9.                 }
    10.             }
    11.             else
    12.             {
    13.                 currentGazeTimeInSeconds = 0;
    14.             }
    15.  
    I could do this with StartCoroutine. I just don't know if the method CheckChunksVisibleis useful this way. Or if there is a better way. Maybe also hide chunks that are behind other chunks etc.

    I thought your asset is doing this on the GPU?

    Thanks!
     
    Last edited: Feb 1, 2019
  13. drcrck

    drcrck

    Joined:
    May 23, 2017
    Posts:
    253
    No, what you're doing is regular frustum culling, it's already done by Unity. Doing it twice can't increase FPS :)

    What I mean is to select 1 camera position and compare FPS with all chunks enabled and some chunks manually disabled in the hierarchy. Not the ones which are outside camera frustum, but the ones which are inside, but can't be seen. Example: https://i.imgur.com/N0Zmdbb.png

    That's exactly what OC does

    Yeah but the outcome is disabled chunks. And you can do it yourself to approximate the potential effect of OC.
     
  14. Firlefanz73

    Firlefanz73

    Joined:
    Apr 2, 2015
    Posts:
    987
    If I disable my some of my chunks it get's more performant, yes :)

    I believe when walking on the surface, a big problem is chunks that are under the "surface ground chunks" which I cannot see anyway but I guess they are all rendered…

    Does your asset help with These? Then I guess my performance should be a lot better (for GPU, the other stuff is already good)…

    Does your asset work with transparent parts also? In my case like a Ground chunk under a water chunk? Or a large Building but with big windows on all sides?

    I would really like to test and give you feedback and when it is helping and not too expensive I will gladly buy it. :)

    Thanks
     
  15. drcrck

    drcrck

    Joined:
    May 23, 2017
    Posts:
    253
    Then it will help. Especially if you have realtime shadows from the sun, so invisible underground chunks are also rendered into the shadowmap.

    It shouldn't be an issue
     
    Firlefanz73 likes this.
  16. Firlefanz73

    Firlefanz73

    Joined:
    Apr 2, 2015
    Posts:
    987
    Yes I have these! I am using "Enviro" and also additional torch (point) lights etc.
     
  17. drcrck

    drcrck

    Joined:
    May 23, 2017
    Posts:
    253
    Free demo is available!
    Requirements: Windows x64, DX11, Unity 2017+
    PM me if you'd like to check it out
     
    Last edited: Feb 8, 2019
    Firlefanz73 likes this.
  18. drcrck

    drcrck

    Joined:
    May 23, 2017
    Posts:
    253
    The demo was updated and now supports ILL2CPP
     
  19. FiveFingerStudios

    FiveFingerStudios

    Joined:
    Apr 22, 2016
    Posts:
    319
    I’d love to check out the demo. I’ll send you a PM
     
  20. drcrck

    drcrck

    Joined:
    May 23, 2017
    Posts:
    253
    By default, it consumes 0.050 ms per frame to scan currently active scenes to detect new objects and process them according to the layer rules you mentioned and other settings.

    Also it spends another 0.050 ms to validate active occludees and remove them from the GPU buffers when their gameobjects are removed from the scene.

    You can change the time limits or completely disable the first feature if it doesn't fit your game (there are other ways to manage objects).

    The real time consumer is dynamic occludees because their transforms must be checked every frame and all changes must be sent to GPU. It's expensive and most likely it's faster to simply draw them, especially for instanced objects. More details in documentation (soon™).

    Other than these 3 things, nothing important is done on CPU.
     
  21. FiveFingerStudios

    FiveFingerStudios

    Joined:
    Apr 22, 2016
    Posts:
    319
    My game is currently CPU bound so that is the biggest concern for my game. That's very little CPU time, so that's great.

    Have you done any tests to see how much of a savings there are for not rendering vs running the occlusion code on the GPU?

    Also, keep up the great work....I think it could really help a lot of developers
     
  22. drcrck

    drcrck

    Joined:
    May 23, 2017
    Posts:
    253
    It helps in this case too, since Unity doesn't need to process disabled objects (do frustum culling, sorting, building command buffers and so on) and it saves some CPU time (mostly on the rendering thread)

    "not rendering" means an empty scene? :D I'm not sure I understand what exactly you want me to test
     
  23. FiveFingerStudios

    FiveFingerStudios

    Joined:
    Apr 22, 2016
    Posts:
    319
    Sorry, I meant rendering calculations to determine if a renderer should be enabled or not vs just rendering it.

    A bad question since it depends on what. The renderer is rendering, amount of materials, light pass, etc

    I noticed that some of my renderers where being occluded when they should not be, the seamed to be smaller items. I could seem to get them to stay visible without turning off and on.
     
  24. drcrck

    drcrck

    Joined:
    May 23, 2017
    Posts:
    253
    "just rendering" might be faster if the percent of occluded objects is very low (for example, you're looking at forest trees from above — all trees are visible, OC does nothing)

    It's either Visibility Threshold (it's like global LOD for all objects, decrease the value if you don't see some small distant objects when you should) or simply a bug of the version you used
     
  25. FiveFingerStudios

    FiveFingerStudios

    Joined:
    Apr 22, 2016
    Posts:
    319
    Yea, I have it reduced it to zero already to might be a bug.

    Curious, how are you handling cutout shaders, like a chain link fence?

    Also, when do you plan on releasing it to the asset store?
     
    Last edited: Feb 10, 2019
  26. drcrck

    drcrck

    Joined:
    May 23, 2017
    Posts:
    253

    First post updated with a new demo scene! This time it has 100000+ mesh renderers, 18000+ particle systems, 6000+ point lights and 1 directional light with realtime shadows.

    PM me if you want to test it in your project!
     
    Last edited: Feb 11, 2019
    Osher, zmaxz, christoph_r and 2 others like this.
  27. drcrck

    drcrck

    Joined:
    May 23, 2017
    Posts:
    253
    Comparison with the built-in OC

    This scene is smaller, but the camera is above the roofs so it's actually harder to render, even after OC.

    Note:
    1. LODs are not used. With LODs, the performance will be better in all cases and the difference will be less drastic.
    2. FPS is as it's shown in Stats, and timings are from RenderDoc, so they might not match.

    No OC (4.2 FPS):

    GBuffer: 48 ms
    Lighting: 20 ms (point lights from torches + shadow map from the moon)
    Particles: 32 ms




    Built-in OC (6.4 FPS):

    GBuffer: 37 ms
    Lighting: 20 ms
    Particles: 23 ms

    I think it might be better with non-default baking settings but it would take too much time to try it.



    GDOC (63.5 FPS):

    GBuffer: 17 ms
    Lighting: 5 ms
    Particles: 1 ms

     
    Last edited: Feb 13, 2019
    Bodyclock and Firlefanz73 like this.
  28. zornor90

    zornor90

    Joined:
    Sep 16, 2015
    Posts:
    128
    Hey, out of curiosity would using this package raise minimum system requirements and / or require a certain amount of GPU? It seems really cool (tried out the demo), but I'm wondering if it would behave differently on someone who had a 1 GB or 2 GB GPU from a few years ago as opposed to my 1080TI

    We have a lot of players who play on laptops and I want to make sure that adding this won't make our game unplayable for them

    EDIT: Also we stream assets in and out as the player moves through the world, will that cause any issues with this camera component still having references to deleted objects? We use prefabs not scenes for our streaming system
     
    Last edited: Feb 13, 2019
  29. drcrck

    drcrck

    Joined:
    May 23, 2017
    Posts:
    253
    The last video was recorded on GTX 960 2GB
    Also I tested it on Intel HD Graphics 530 and it worked, giving significant fps boost (numbers were like 1 fps vs 40 fps, this scene without LODs is definitely too hard for an intel gpu, even with OC)

    It automatically deletes removed objects and processes newly created (if background scan is enabled)
     
    zornor90 and spaceemotion like this.
  30. zornor90

    zornor90

    Joined:
    Sep 16, 2015
    Posts:
    128
    Okay that's awesome to hear - one more question, will this work alongside software like GPU Instancer? https://assetstore.unity.com/packages/tools/utilities/gpu-instancer-117566
     
  31. drcrck

    drcrck

    Joined:
    May 23, 2017
    Posts:
    253
    It works with anything that exists in the scene hierarchy as GameObjects
     
  32. FiveFingerStudios

    FiveFingerStudios

    Joined:
    Apr 22, 2016
    Posts:
    319
    How are you handling meshes that use cutout shaders? Can those be excluded?
     
  33. drcrck

    drcrck

    Joined:
    May 23, 2017
    Posts:
    253
    They don't require any special handling, it just works — all shaders end up in the same depth buffer and once it's rendered, you can't tell was it a cutout shader or a complex mesh.
     
  34. FiveFingerStudios

    FiveFingerStudios

    Joined:
    Apr 22, 2016
    Posts:
    319
    I guess I should have been more specific.

    Is there any fine grained control over which meshes can be occluders? I know you are using layers, but there are some gameObjects that require special handling and need to be the same layer because of lighting.

    For example:
    A chainlink fence shouldn't be able to hide any objects behind it since its mostly gaps and you would be able to see occlusion at work.
     
  35. drcrck

    drcrck

    Joined:
    May 23, 2017
    Posts:
    253
    No, it's not possible in this method — the whole depth buffer is the occluder, and cutout chainlink or mesh chainlink look the same there, regardless of their shaders

    They don't survive depth downsampling so it's not an issue

    upload_2019-2-15_3-44-20.png
    upload_2019-2-15_3-44-40.png
    upload_2019-2-15_3-44-55.png

    But it's not a special handling of cutout shaders, it would work the same way if it was a complex mesh

    --
    Brand new GDOC Discord: https://discord.gg/hMUTyfZ
     
    Last edited: Feb 14, 2019
  36. FiveFingerStudios

    FiveFingerStudios

    Joined:
    Apr 22, 2016
    Posts:
    319
    Awesome!
     
  37. tspk91

    tspk91

    Joined:
    Nov 19, 2014
    Posts:
    70
    Hi, how do you make objects not render? Changing .enable of renderers? And does this have delay from GPU to CPU or everything is done in one frame? Really cool plugin, at last modern occlusion culling in Unity.
     
  38. drcrck

    drcrck

    Joined:
    May 23, 2017
    Posts:
    253
    Yes, changing enable and shadowCastingMode

    It does, so I'm using some techniques to make the delay acceptable in most cases.

    There are only 2 ways to eliminate the GPU→CPU delay:
    1) Wait for GPU to readback the results (not an option actually due to extreme performance impact).
    2) Draw everything indirectly. It requires very deep integration into the engine, especially for lights and other objects that are not mesh renderers. Good option but not possible for an asset.
     
    tspk91 likes this.
  39. Peter77

    Peter77

    Joined:
    Jun 12, 2013
    Posts:
    3,348
    Does it work with LOD Group?

    Additionally, we sometimes use a lower LOD to render the shadow, using such MeshRenderer/LODGroup setup:
    • Render mesh of LOD0 using mesh_lod0.fbx (MeshRenderer.castShadows=Off)
    • Render shadow of LOD0 using mesh_lod1.fbx (MeshRenderer.castShadows=shadowsOnly)
     
  40. drcrck

    drcrck

    Joined:
    May 23, 2017
    Posts:
    253
    Yes, it was implemented in the latest version, now it correctly works with this setup

    New demo is available in GDOC Discord: https://discord.gg/GhKTEXy
     
  41. Firlefanz73

    Firlefanz73

    Joined:
    Apr 2, 2015
    Posts:
    987
    I was on #General, didn't look at #News.

    I ran around a lot. After a longer while again I had a hole in the landscape. I pressed F1, and it was gone. Again I pressed F1 and gDoc was working again, no hole. Happened only one time.

    No crash yet...
     
  42. mons00n

    mons00n

    Joined:
    Sep 18, 2013
    Posts:
    215
    What are the chances of getting something like this to run on mac/linux builds?
     
  43. drcrck

    drcrck

    Joined:
    May 23, 2017
    Posts:
    253
    It will be added in future releases, but no ETA yet.
     
    mons00n likes this.
  44. drcrck

    drcrck

    Joined:
    May 23, 2017
    Posts:
    253
  45. chrisk

    chrisk

    Joined:
    Jan 23, 2009
    Posts:
    368
    Hi,
    I tested the demo package on my large outdoor map with 1km x 1km but it doesn't seem to make much difference.
    I'm using Vegetation Studio Pro for trees and foliages though.

    Is it supposed to work well in outdoor terrain scene? Yeah, it's not flat terrain so visiblity is somewhat limited.

    Thanks.
     
  46. drcrck

    drcrck

    Joined:
    May 23, 2017
    Posts:
    253
    Hi,
    Currently it works only with objects that exist in the scene hierarchy (but not Terrain as there's no API to work with its chunks)
    Vegetation Studio integration will be added in future versions
     
  47. chrisk

    chrisk

    Joined:
    Jan 23, 2009
    Posts:
    368
    I see. I'll try to test once again when VSP support is in. Thanks.
     
  48. drcrck

    drcrck

    Joined:
    May 23, 2017
    Posts:
    253
    GDOC is now available on the Asset Store!
    http://u3d.as/1rYU

    This is the very first release so expect some bugs
    Please report them in #bug-reports on Discord: https://discord.gg/hMUTyfZ
    Or in this thread

    To achieve the best results with the current version, make sure:

    1. Scenes are big and have many objects that can be potentially occluded (like in the demo scene)
    2. Objects exist in the scene hierarchy as MeshRenderers or other supported components
    3. You have a Directional Light with realtime shadows
    4. The number of drawcalls is the main bottleneck

    You can PM me in case you're not sure if it will work well for your game
     
  49. dirkjacobasch

    dirkjacobasch

    Joined:
    Apr 24, 2018
    Posts:
    123
    Hi,
    Will it be possible to use multiple cameras in a later update?
     
  50. drcrck

    drcrck

    Joined:
    May 23, 2017
    Posts:
    253
    Yeah it might be added in future versions
     
    Last edited: Mar 10, 2019
    dirkjacobasch likes this.