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Sandbox for graphics paper implementation

I'll randomly put something for implementing/validating graphics papers here.
Information
Category: C/C++ / GUI
Watchers: 3
Star: 10
Fork: 0
Last update: Aug 17, 2021
Resource links
https://github.com/shocker-0x15/GfxExp

Graphics Experiments

適当にグラフィックス関連の論文などを読んで実装・検証したものを置きます。

I'll randomly put something for implementing/validating graphics papers here.

実装 / Implementations

ReSTIR

Spatiotemporal reservoir resampling for real-time ray tracing with dynamic direct lighting
https://research.nvidia.com/publication/2020-07_Spatiotemporal-reservoir-resampling

example

その他 / Miscellaneous

OptiX/CUDAのラッパーとしてOptiX Utilityを使用しています。

Programs here use OptiX Utility as OptiX/CUDA wrapper.

動作環境 / Confirmed Environment

現状以下の環境で動作を確認しています。
I've confirmed that the program runs correctly in the following environment.

  • Windows 10 (21H1) & Visual Studio Community 2019 (16.10.4)
  • Core i9-9900K, 32GB, RTX 3080 10GB
  • NVIDIA Driver 471.41

動作させるにあたっては以下のライブラリが必要です。
It requires the following libraries.

  • CUDA 11.3 Update 1
    OptiX Utilityは少し古いバージョンでも動作するとは思います。単にサンプルコードがこのバージョンに依存しているだけです。
    ※CUDA 11.3.0にはバグがあり、OptiX Utilityと一緒に使用することができません。Update 1以降が必要です。
    OptiX Utility may work with a bit older versions. The sample code just assumes this version.
    * CUDA 11.3.0 has a bug which prevents to use it with OptiX Utility. You need to use Update 1 or later.
  • OptiX 7.3.0 (requires Maxwell or later generation NVIDIA GPU)

2021 @Shocker_0x15

0 Open More issues
Closed

Question about Neural Radiance Cache

Thanks for your implementation of this algorithm!

Beginner's question: I am trying to understand the training part of the NRC algorithm. I have read the paper several times and it's still not clear to me.

Say, you have a path x0 x1 x2 (x0 - camera, x1 - surface, x2 - surface). How do you train the cache?

  1. Do you explicitly sample lights at each intermediate vertex, to get paths x0 x1 l2 (where l2 is now vertex on a light source) and x0 x1 x2 l3 and then put end vertices (in this case x1, and x2) and direction (x2 -> x1, and x1 -> x0) into cache?
  2. How does the "path extension" work?
  3. There was an issue with "flickering" that was solved by temporal smoothing. How do you solve this problem?
opened May 10, 2022 by ib00 8
Closed

bug in createGeometryInstance()

Howdy,

Thanks for making these interesting experiments available! Will you be making a license file for this project?

I think I found a bug in createGeometryInstance() starting on line 1599 of common_host.cpp where the aabb is being created.

for (int triIdx = 0; triIdx < triangles.size(); ++triIdx) {
        const shared::Triangle &tri = triangles[triIdx];
        const shared::Vertex (&vs)[3] = {
            vertices[tri.index0],
            vertices[tri.index1],
            vertices[tri.index2],
        };
        geomInst->aabb
            .unify(vertices[0].position)
            .unify(vertices[1].position)
            .unify(vertices[2].position);
    }

I think the correct code should be:

geomInst->aabb
            .unify(vs[0].position)
            .unify(vs[1].position)
            .unify(vs[2].position)
opened May 24, 2022 by Hurleyworks 3
Closed

Materials do not re-use textures leading to duplicate textures in memory.

Hi,

When using a scene such as lost-empire I get the following error : Error: CUDA call (cuArray3DCreate(&m_array, &arrayDesc) ) failed with error: 'out of memory' (C:\Users\X\Documents\Shocker\GfxExp\utils\cuda_util.cpp:693). I think what is happening is that for every material in the mtl file the map_Ka and map_Kd attributes are loaded into memory even if those same textures have been loaded into memory already for another material. This is confirmed by the console output:


[ 4][  DISK CACHE]: Opened database: "C:\Users\X\AppData\Local\NVIDIA\OptixCache\optix7cache.db"
[ 4][  DISK CACHE]:     Cache data size: "1.8 MiB"
[ 4][   DISKCACHE]: Cache hit for key: ptx-538030-keyf4770f7ee17acca7955c0792d6c5b076-sm_61-rtc0-drv496.76
[ 4][COMPILE FEEDBACK]:
[ 4][   DISKCACHE]: Cache hit for key: ptx-40534-keyf6edc5a05105d08ef92e4c8cff25c7c6-sm_61-rtc0-drv496.76
[ 4][COMPILE FEEDBACK]:
[ 4][COMPILE FEEDBACK]: Info: Pipeline has 1 module(s), 35 entry function(s), 32 trace call(s), 0 continuation callable call(s), 54 direct callable call(s), 707 basic block(s) in entry functions, 19309 instruction(s) in entry functions, 0 non-entry function(s), 0 basic block(s) in non-entry functions, 0 instruction(s) in non-entry functions

Reading: ../scenes/lost-empire/lost_empire.obj ... done.
DefaultMaterial:
Stone:
  Reading: ../scenes/lost-empire/lost_empire-RGB.png ... done.
Grass_Block:
  Reading: ../scenes/lost-empire/lost_empire-RGB.png ... done.
Dirt:
  Reading: ../scenes/lost-empire/lost_empire-RGB.png ... done.
Cobblestone:
  Reading: ../scenes/lost-empire/lost_empire-RGB.png ... done.
Oak_Planks:
  Reading: ../scenes/lost-empire/lost_empire-RGB.png ... done.
Stationary_Water:
  Reading: ../scenes/lost-empire/lost_empire-RGBA.png ... done.
Stationary_Lava:
  Reading: ../scenes/lost-empire/lost_empire-RGB.png ... done.
  Reading: ../scenes/lost-empire/lost_empire-RGB.png ... done.
Sand:
  Reading: ../scenes/lost-empire/lost_empire-RGB.png ... done.
Gravel:
  Reading: ../scenes/lost-empire/lost_empire-RGB.png ... done.
Iron_Ore:
  Reading: ../scenes/lost-empire/lost_empire-RGB.png ... done.
Coal_Ore:
  Reading: ../scenes/lost-empire/lost_empire-RGB.png ... done.
Oak_Log:
  Reading: ../scenes/lost-empire/lost_empire-RGB.png ... done.
Oak_Leaves:
  Reading: ../scenes/lost-empire/lost_empire-RGBA.png ... done.
Bed:
  Reading: ../scenes/lost-empire/lost_empire-RGBA.png ... done.
Powered_Rail:
  Reading: ../scenes/lost-empire/lost_empire-RGBA.png ... done.
Detector_Rail:
  Reading: ../scenes/lost-empire/lost_empire-RGBA.png ... done.
Sticky_Piston:
  Reading: ../scenes/lost-empire/lost_empire-RGB.png ... done.
Wool:
  Reading: ../scenes/lost-empire/lost_empire-RGB.png ... done.
Dandelion:
  Reading: ../scenes/lost-empire/lost_empire-RGBA.png ... done.
Poppy:
  Reading: ../scenes/lost-empire/lost_empire-RGBA.png ... done.
Brown_Mushroom:
  Reading: ../scenes/lost-empire/lost_empire-RGBA.png ... done.
Double_Stone_Slab:
  Reading: ../scenes/lost-empire/lost_empire-RGB.png ... done.
Stone_Slab:
  Reading: ../scenes/lost-empire/lost_empire-RGB.png ... done.
Obsidian:
  Reading: ../scenes/lost-empire/lost_empire-RGB.png ... done.
Torch:
  Reading: ../scenes/lost-empire/lost_empire-RGBA.png ... done.
  Reading: ../scenes/lost-empire/lost_empire-RGBA.png ... done.
Oak_Stairs:
  Reading: ../scenes/lost-empire/lost_empire-RGB.png ... done.
Chest:
  Reading: ../scenes/lost-empire/lost_empire-RGB.png ... done.
Redstone_Wire:
  Reading: ../scenes/lost-empire/lost_empire-RGBA.png ... Error: CUDA call (cuArray3DCreate(&m_array, &arrayDesc) ) failed with error: 'out of memory' (C:\Users\X\Documents\Shocker\GfxExp\utils\cuda_util.cpp:693)

As you can see the same textures are loaded over and over.

opened Feb 3, 2022 by l2- 3
Closed

DynamicFunction

What does DynamicFunction class do? Is it an equivalent to a function pointer on a device?

I am interested in using this abstraction (function pointer) for one of my projects. Is there a simple example of how it's used in a kernel?

Thanks!

opened May 15, 2022 by ib00 1
Closed

Question about light contribution calculation

Hi,

https://github.com/shocker-0x15/GfxExp/blob/ec95e561121812b7224579e3190d05db77ff19a4/restir/optix_kernels.cu#L868 https://github.com/shocker-0x15/GfxExp/blob/ec95e561121812b7224579e3190d05db77ff19a4/restir/optix_kernels.cu#L1403 I noticed that emittance is divided by PI even when the primary hit of the ray was an emitter. I was wondering what the reason is for this? For example if a primary ray hits an emitter with emittance (1.0, 1.0, 1.0) the shading will result in (1/pi, 1/pi, 1/pi) resulting in a visually dimmed primitive on the screen. Naturally this is only noticeable with emitters with emitting strength lower than pi.

image Here I am hovering a pixel for which the primary hit is an emitter with values (1.0, 1.0, 1.0) as you can see in the debug info. I think the pixel in that case should also have value (1.0, 1.0 ,1.0) unless I understand wrong.

This is the result when using contribution += emittance; image

opened Mar 26, 2022 by l2- 1
Open

Crash in path_tracing project in debug mode only

Hi,

I'm getting a consistent crash in all scenes I try using the path_tracing project in Debug mode only. Release mode works fine. The error message that appears using Nsight->CUDA Debugging is [Error 700: Illegal address during kernel execution].

And the debugger usually stops at this line

CUDA_DEVICE_KERNEL void RT_CH_NAME(pathTraceBaseline)() {
    pathTrace_closestHit_generic();
}

OptiX 7.40 / CUDA 11.7 Driver: 516.59 Visual Studio 2022 17.2.4 Windows 10 RTX 2070 SUPER

Can you confirm this using your environment? I wonder if it has anything to do with this thread. https://forums.developer.nvidia.com/t/illegal-address-error-when-using-both-geometrytriangles-and-geometry-nodes/218956/18

opened Jul 21, 2022 by Hurleyworks 3

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