Basics:

There is a detailed article of Nvidia to start learning raytracing. But here are some key points to consider:

• Enable VK_NV_ray_tracing device extension.
• Build Bottom Level Acceleration Structure- holding actual scene geometry and vertex data
• Build Top Level Acceleration Structure- holding instance data and transformation matrix
• Update a single set of descriptor set containing all necessary information to render a scene. Ex., all the material textures, acceleration structure, output image, vertex and index buffers, uniforms data
• 3 Shaders: Ray Generation, Miss and Closest Hit
• Create Shader Binding Table containing shader handles of the 3 shaders mentioned above

Here is my implementation to render a triangle.

Problems encountered:

• RayTracingPipelineNV creation error.

  
  

  A programmer's nightmare: "This was a nullptr" or "Exception thrown: read access violation"
  Yes I've been there too more often than not! This took me quiet some time to understand and resolve.
  
  You see that for loop; I didn't explicitly assign initial values to every variables in shader stage info struct, so they were garbage. It's like Vulkan's moto: Be Explicit.
  Well this was a minor problem but it took a while to get here. More accurate: Initialize structs with {}.
  

  VkPipelineShaderStageCreateInfo shaderStages{};

• Infamous black screen.
  You should know where to look at! I didn't.
  Initially I didn't implement a camera. So, I was putting origin for ray generation in shader vec3(0,0,0). And guess where my traingle was getting rendererd. Origin!