Code comments

examples/raytracinggltf/raytracinggltf.cpp

@@ -1,5 +1,5 @@
 /*
- * Vulkan Example - Rendering a glTF model using hardware accelerated ray tracing example /for proper transparency, this sample does frame accumulation)
+ * Vulkan Example - Rendering a glTF model using hardware accelerated ray tracing example (for proper transparency, this sample does frame accumulation)
  *
  * Copyright (C) 2023 by Sascha Willems - www.saschawillems.de
  *
@@ -705,6 +705,10 @@ class VulkanExample : public VulkanRaytracingSample
 	{
 		uniformData.projInverse = glm::inverse(camera.matrices.perspective);
 		uniformData.viewInverse = glm::inverse(camera.matrices.view);
+		// This value is used to accumulate multiple frames into the finale picture
+		// It's required as ray tracing needs to do multiple passes for transparency
+		// In this sample we use noise offset by this frame index to shoot rays for transparency into different directions
+		// Once enough frames with random ray directions have been accumulated, it looks like proper transparency
 		uniformData.frame++;
 		memcpy(ubo.mapped, &uniformData, sizeof(uniformData));
 	}