DirectX Ray-Tracing [DXR]

Discussion in 'Rendering Technology and APIs' started by OCASM, Mar 19, 2018.

  1. DavidGraham

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  2. JoeJ

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    This one is really good. Far the best utilization in a game for me yet. Those crystals... (Edit: I mean the metallic ones with dragon feflected)
     
    #242 JoeJ, Mar 18, 2019
    Last edited: Mar 18, 2019
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  3. OCASM

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    #243 OCASM, Mar 18, 2019
    Last edited: Mar 18, 2019
  4. Ike Turner

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    DXR isn't coming to Untiy until Fall 2019 (and only in preview not final release).
    Same for Unreal Engine btw. As DXR is still an early access feature in 4.2x & it usually takes between 6 to 12 months before it graduates to production ready.

    And from what I've been told AMD is also working on DXR drivers for Vega GPUs.
     
    #244 Ike Turner, Mar 18, 2019
    Last edited: Mar 18, 2019
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  5. iroboto

    iroboto Daft Funk
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    If we can ignore getting into the 'politics' of it, I'm just really glad to see DXR come back as far as Pascal, fingers crossed for Vega perhaps if we're lucky maybe even as early as Polaris.
     
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  6. Arun

    Arun Unknown.
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    So I was at the Battlefield V raytracing presentation at GTC 2019 earlier today, got a few quick pictures but was mostly struck by 2 things:

    1) coherency gathering via compute shaders (binning the rays per-raytracing and « defragging » post-raytracing... as far as I could tell the HW doesn’t really do much if any gathering itself).

    2) Raytracing black box is only a tiny part of the workload, most of the raytracing-related time is the post-processing (and preprocessing!) via compute shaders.

    Ironically PowerVR raytracing HW did a lot more HW acceleration (coherency, BVH, etc...) than it seems NVIDIA is doing. It’ll be interesting to see whether NVIDIA struck the right balance or if we’re going to have more (or less!) accélération of the raytracing pipeline in the future.
     
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  7. DavidGraham

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    Comparison between 1080Ti and 2080 in DXR games, numbers provided by NVIDIA:

     
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  8. OCASM

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    There's also going to be a Unity experimental build released on April 4th.
     
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  9. Ike Turner

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    Yup that's at the link I posted. Experimental on April 4th, Preview Fall 2019, final release probably Q1/Q2 2020. They don't seem too far from UE4 (which just reached early access/experimental now in 4.2x literally 1 year after their PR mumbo jumbo announcement) . As a matter of fact based on what they just showed during their keynote their implementation seems to be better than Epic's.

    Also interesting observation: They have never mentioned it being DXR or even VulkanRT based. Just that it was running on an NV RTX GPU (it was running on a Razer Blade 15 on stage). As a matter of fact they always said "our Real Time ray Tracing technologie". Unity loves cross-platform/API/HW stuff as seen with their new in-house ML inference engine or the fact that even thought PhysX is the default physics engine in Unity right now, they just announced that they've built their own today in collaboration with Havok.
     
    #249 Ike Turner, Mar 19, 2019
    Last edited: Mar 19, 2019
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  10. dogen

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    the sebbbi effect :wink:
     
  11. AlBran

    AlBran Ferro-Fibrous
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    Folks, this is the DXR thread, not RTX.
     
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  12. OCASM

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    Somebody didn't realize this is a DXR ray tracing demo and moved my post to another thread. I'm posting it back here:



    Also:
     
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  13. AlBran

    AlBran Ferro-Fibrous
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    It would help if you gave a description instead of just dropping a link. It’s a discussion forum, not a video site.

    You’re old enough to use words yourself.
     
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  14. OCASM

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    You can ask before taking such drastic actions, old guy.
     
  15. AlBran

    AlBran Ferro-Fibrous
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    again it’s a discussion forum. I’m already fed up with your nonsense derailing and don’t have time for this back and forth. So shove it.
     
  16. DavidGraham

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