Cornell box done in glTF format, with caustics.

Large-format screenshots may require a TDR time extension, if your framerate dips below 1 FPS, like on my 3060:

KeyPath : HKEY_LOCAL_MACHINE\System\CurrentControlSet\Control\GraphicsDrivers
KeyValue : TdrDelay
ValueType : REG_DWORD (32bit)
ValueData : Number of seconds to delay. 2 seconds is the default value.

Based off of Sascha Willems' raytracingreflections code.

Model by Rob Rau.

To obtain and compile the demo code:

Obtain the files

1. Download the base code from: https://github.com/SaschaWillems/Vulkan

2. Extract Vulkan-master directory to your hard drive (e.g. C:/dev/Vulkan-master/)

3. Open command prompt, change directory to C:/dev/Vulkan-master/

4. Type: cmake -G "Visual Studio 17 2022" -A x64

5. Download the assets (models and textures) from: https://github.com/SaschaWillems/Vulkan-Assets

6. Extract the model and textures subdirectories and the assorted files to C:/dev/Vulkan-master/assets/

7. Download the OLD GLM library from: https://github.com/g-truc/glm/tree/1ad55c5016339b83b7eec98c31007e0aee57d2bf

8. Extract the contents of glm-1ad55c5016339b83b7eec98c31007e0aee57d2bf/glm subdirectory to C:/dev/Vulkan-master/external/glm

Building the executables

1. Open the solution file C:/dev/Vulkan-master/vulkanExamples.sln

2. Change build setting to Release mode, x64

3. Select the Build -> Build Solution menu item (be patient, this takes a long time the first time)

4. Run an example (e.g. C:/dev/Vulkan-master/bin/Release/raytracingreflections.exe)

Replacing the source files

1. Copy VulkanglTFModel.cpp and VulkanglTFModel.h to C:/dev/Vulkan-master/base

2. Copy closesthit.rchit, miss.rmiss, raygen.rgen and shadow.rmiss to C:/dev/Vulkan-master/shaders/glsl/raytracingreflections

3. Copy raytracingreflections.cpp to C:/dev/Vulkan-master/examples/raytracingreflections

4. Make directory C:/temp/rob_rau_cornell/gltf/

5. Copy cornell.bin, cornell.gltf, ColorMapWithOpacityAlpha512.png and GlowMapWithReflectionAlpha512.png to C:/temp/rob_rau_cornell/gltf/

6. Delete all projects from the solution, except for ALL_BUILD, base, raytracingreflections and ZERO_CHECK.

7. Rebuild solution

8. Make a batch file rtreflect.bat in C:/dev/Vulkan-master/bin/Release/ with the following contents:

glslc.exe "C:\dev\Vulkan-master\shaders\glsl\raytracingreflections\closesthit.rchit" --target-env=vulkan1.2 -o "C:\dev\Vulkan-master\shaders\glsl\raytracingreflections\closesthit.rchit.spv"
glslc.exe "C:\dev\Vulkan-master\shaders\glsl\raytracingreflections\miss.rmiss" --target-env=vulkan1.2 -o "C:\dev\Vulkan-master\shaders\glsl\raytracingreflections\miss.rmiss.spv"
glslc.exe "C:\dev\Vulkan-master\shaders\glsl\raytracingreflections\raygen.rgen" --target-env=vulkan1.2 -o "C:\dev\Vulkan-master\shaders\glsl\raytracingreflections\raygen.rgen.spv"
glslc.exe "C:\dev\Vulkan-master\shaders\glsl\raytracingreflections\shadow.rmiss" --target-env=vulkan1.2 -o "C:\dev\Vulkan-master\shaders\glsl\raytracingreflections\shadow.rmiss.spv"
raytracingreflections.exe