Introduction ray-tracing and path-tracing

Introduction ray-tracing and path-tracing

• 1.
  Introduction to Ray-Tracing andPath-Tracing using WebGPU A beginner-friendly overview of real-time rendering with modern web technologies
• 2.
  What is Ray-Tracing? •- A rendering technique that simulates how light interacts with surfaces • - Traces the path of light rays from the camera into the scene • - Produces reflections, refractions, and shadows • - Used in movies and now in real-time games
• 3.
  How Does Ray-TracingWork? • - Shoots rays from the camera through each pixel • - Determines intersections with scene geometry • - Calculates light interactions (reflection, refraction, shadows) • - Uses BVH (Bounding Volume Hierarchy) for efficiency
• 4.
  Question • Why isray-tracing computationally expensive? • (A) It requires tracing multiple rays per pixel • (B) It involves complex light calculations • (C) It depends on high-memory acceleration structures • (D) All of the above • Answer: (D) All of the above
• 5.
  Introduction to Path-Tracing •- A more realistic extension of ray-tracing • - Traces multiple rays per pixel, bouncing randomly • - Uses Monte Carlo integration to approximate global illumination • - More accurate but noisier and more computationally expensive
• 6.
  Why Use WebGPUfor Ray-Tracing? • - A modern graphics API for high-performance rendering in the browser • - Better performance and flexibility than WebGL • - Supports compute shaders, essential for ray-tracing • - Works across multiple platforms (Windows, macOS, Linux, mobile)
• 7.
  Question • Which ofthe following is a key advantage of WebGPU over WebGL for ray-tracing? • (A) Built-in ray-tracing support • (B) Compute shader capabilities • (C) Fully hardware-accelerated path-tracing • (D) Supports ray-tracing on all devices • Answer: (B) Compute shader capabilities
• 8.
  Acceleration Structures inRay-Tracing • - Essential for optimizing ray intersection tests • - BVH (Bounding Volume Hierarchy) is the most used structure • - BVH reduces the number of ray-object intersection tests • - WebGPU compute shaders can build and traverse BVH
• 9.
  Implementing a SimpleRay-Tracer in WebGPU • 1. Set up WebGPU rendering pipeline • 2. Use compute shaders to trace rays • 3. Implement ray-scene intersection tests • 4. Accumulate lighting and shading effects • 5. Display the rendered image
• 10.
  Question • What isthe primary role of a BVH in ray-tracing? • (A) To increase the number of ray-object intersections • (B) To reduce the number of intersection tests • (C) To store the final rendered image • (D) To generate random ray directions • Answer: (B) To reduce the number of intersection tests
• 11.
  Challenges in Real-TimePath-Tracing • - Handling noise (requires denoising techniques) • - Performance optimization (importance sampling, adaptive sampling) • - Hardware limitations in browsers • - Managing memory and parallel computation efficiently
• 12.
  Future of WebGPURay-Tracing • - Improving performance with hardware ray-tracing support • - Advanced denoising techniques for real-time rendering • - AI-assisted acceleration (DLSS, neural rendering) • - Potential integration with game engines and WebXR
• 13.
  Any Questions? Open discussionon challenges and possibilities