PathTracer Learning

• PathTracer Learning — Master Index

  • A deep-dive learning graph for building a GPU path tracer in Godot, based on the NVPathtracer contributor discussions and modern rendering research.
  • This graph covers everything from foundational math to Vulkan ray tracing pipelines and Godot engine internals.

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• Learning Phases

  • PathTracer Learning - Phase 1 - Math for Graphics
    • Vectors, matrices, coordinate systems, radiometry, probability theory
  • PathTracer Learning - Phase 2 - CPU Ray Tracing
    • Build a software ray tracer first — understand the algorithm before GPU
  • PathTracer Learning - Phase 3 - GPU and Vulkan
    • Vulkan ray tracing pipeline, shader binding tables, acceleration structures
  • PathTracer Learning - Phase 4 - Godot Internals
    • RenderingDevice, RenderSceneBuffers, how Godot’s renderer is structured
  • PathTracer Learning - Phase 5 - Advanced Topics
    • ReSTIR, DLSS, denoising, production-quality rendering

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• Key Algorithm Pages

  • PathTracer Learning - Path Tracing Algorithm
    • The core rendering equation and how path tracing solves it
  • PathTracer Learning - BLAS and TLAS
    • Bottom-level and top-level acceleration structures for RT
  • PathTracer Learning - Vulkan RT Pipeline
    • VK_KHR_ray_tracing_pipeline — stages, SBT, ray generation
  • PathTracer Learning - DLSS and Denoising
    • Temporal accumulation, DLSS 3.5 Ray Reconstruction
  • PathTracer Learning - ReSTIR
    • Reservoir-based spatiotemporal importance resampling

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• Math & Radiometry Concepts

  • PathTracer Learning - Concept - Dot Product
  • PathTracer Learning - Concept - Cross Product
  • PathTracer Learning - Concept - Solid Angle
  • PathTracer Learning - Concept - Radiometry
  • PathTracer Learning - Concept - Monte Carlo Integration
  • PathTracer Learning - Concept - Importance Sampling
  • PathTracer Learning - Concept - MIS

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• Geometry & Intersection Concepts

  • PathTracer Learning - Concept - Ray Definition
  • PathTracer Learning - Concept - Ray-Triangle Intersection
  • PathTracer Learning - Concept - AABB
  • PathTracer Learning - Concept - BVH Construction
  • PathTracer Learning - Concept - BVH Traversal
  • PathTracer Learning - Concept - Camera Model

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• Shading & Material Concepts

  • PathTracer Learning - Concept - BRDF
  • PathTracer Learning - Concept - Microfacet Theory
  • PathTracer Learning - Concept - Fresnel Effect
  • PathTracer Learning - Concept - Normal Mapping
  • PathTracer Learning - Concept - Environment Map

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• Path Tracing Concepts

  • PathTracer Learning - Concept - Russian Roulette
  • PathTracer Learning - Concept - Next Event Estimation
  • PathTracer Learning - Concept - Temporal Accumulation
  • PathTracer Learning - Concept - Temporal Rejection
  • PathTracer Learning - Concept - Tone Mapping
  • PathTracer Learning - Concept - Anti-Aliasing

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• Vulkan Concepts

  • PathTracer Learning - Concept - Async Compute
  • PathTracer Learning - Concept - Device Address Bit

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• Reference

  • PathTracer Learning - Books and Tutorials
  • PathTracer Learning - Chat Analysis
    • Notes from the actual Godot NVPathtracer contributor chat

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• Projects

  • PathTracer Learning - Project - Math Library
  • PathTracer Learning - Project - CPU Path Tracer
  • PathTracer Learning - Project - Vulkan RT

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• Progress Journal

  • 2026_03_20
  • 2026_03_23