# rongxuancheng/the_code_of_rtweekend architecture

> Architecture diagram of the GitHub repository rongxuancheng/the_code_of_rtweekend, generated by GitDiagram from its file tree, README and a sample of source files (last updated 2026-09-30). It is an AI-made overview: check details against the source.

- Interactive diagram: https://gitdiagram.com/rongxuancheng/the_code_of_rtweekend
- Repository: https://github.com/rongxuancheng/the_code_of_rtweekend

## Overview

This is a small C++ path-tracing renderer. Its workflow is to assemble a scene of spheres and materials, configure a camera, trace and shade sampled rays, then write a P3 pixel stream to standard output. The graph reflects the sampled headers and source; no README is present, and no additional capabilities are inferred.

Main entry points: [`include/camera.h`](https://github.com/rongxuancheng/the_code_of_rtweekend/blob/main/include/camera.h) (Camera Renderer), [`src/main.cpp`](https://github.com/rongxuancheng/the_code_of_rtweekend/blob/main/src/main.cpp) (Scene Setup), [`include/hittable_list.h`](https://github.com/rongxuancheng/the_code_of_rtweekend/blob/main/include/hittable_list.h) (Object List), [`include/material.h`](https://github.com/rongxuancheng/the_code_of_rtweekend/blob/main/include/material.h) (Surface Materials)

## Diagram (Mermaid)

```mermaid
flowchart TD

subgraph group_app["Application"]
  node_main["Scene Setup<br/>[main.cpp]"]
end

subgraph group_render["Rendering"]
  node_camera["Camera Renderer<br/>[camera.h]"]
  node_output["P3 Output<br/>[color.h]"]
end

subgraph group_scene["Scene Model"]
  node_world["Object List<br/>[hittable_list.h]"]
  node_hittable["Hit Interface<br/>[hittable.h]"]
  node_sphere["Sphere Geometry<br/>[sphere.h]"]
  node_material["Surface Materials<br/>[material.h]"]
end

subgraph group_core["Ray Math"]
  node_ray["Ray<br/>[ray.h]"]
  node_vector["Vector Math<br/>[vec3.h]"]
  node_interval["Intervals<br/>[interval.h]"]
  node_runtime["Renderer Utilities<br/>[rtweekend.h]"]
end

node_user(("Invoker"))

node_user -->|"starts"| node_main
node_main -->|"assembles scene"| node_world
node_main -->|"creates spheres"| node_sphere
node_main -->|"creates materials"| node_material
node_main -->|"configures and renders"| node_camera
node_camera -->|"queries hits"| node_world
node_world -->|"dispatches hit"| node_hittable
node_sphere -->|"implements hit"| node_hittable
node_camera -->|"scatters rays"| node_material
node_camera -->|"writes pixels"| node_output
node_sphere -->|"checks bounds"| node_interval
node_world -->|"narrows hit range"| node_interval
node_camera -->|"generates rays"| node_ray
node_material -->|"creates scattered rays"| node_ray
node_ray -->|"uses coordinates"| node_vector
node_output -->|"formats color vectors"| node_vector
node_camera -->|"uses sampling helpers"| node_runtime
node_material -->|"uses random helpers"| node_runtime

click node_main "https://github.com/rongxuancheng/the_code_of_rtweekend/blob/main/src/main.cpp"
click node_camera "https://github.com/rongxuancheng/the_code_of_rtweekend/blob/main/include/camera.h"
click node_output "https://github.com/rongxuancheng/the_code_of_rtweekend/blob/main/include/color.h"
click node_world "https://github.com/rongxuancheng/the_code_of_rtweekend/blob/main/include/hittable_list.h"
click node_hittable "https://github.com/rongxuancheng/the_code_of_rtweekend/blob/main/include/hittable.h"
click node_sphere "https://github.com/rongxuancheng/the_code_of_rtweekend/blob/main/include/sphere.h"
click node_material "https://github.com/rongxuancheng/the_code_of_rtweekend/blob/main/include/material.h"
click node_ray "https://github.com/rongxuancheng/the_code_of_rtweekend/blob/main/include/ray.h"
click node_vector "https://github.com/rongxuancheng/the_code_of_rtweekend/blob/main/include/vec3.h"
click node_interval "https://github.com/rongxuancheng/the_code_of_rtweekend/blob/main/include/interval.h"
click node_runtime "https://github.com/rongxuancheng/the_code_of_rtweekend/blob/main/include/rtweekend.h"

classDef toneNeutral fill:#f8fafc,stroke:#334155,stroke-width:1.5px,color:#0f172a
classDef toneBlue fill:#dbeafe,stroke:#2563eb,stroke-width:1.5px,color:#172554
classDef toneAmber fill:#fef3c7,stroke:#d97706,stroke-width:1.5px,color:#78350f
classDef toneMint fill:#dcfce7,stroke:#16a34a,stroke-width:1.5px,color:#14532d
classDef toneRose fill:#ffe4e6,stroke:#e11d48,stroke-width:1.5px,color:#881337
classDef toneIndigo fill:#e0e7ff,stroke:#4f46e5,stroke-width:1.5px,color:#312e81
classDef toneTeal fill:#ccfbf1,stroke:#0f766e,stroke-width:1.5px,color:#134e4a
class node_main toneBlue
class node_camera,node_output toneAmber
class node_world,node_hittable,node_sphere,node_material toneMint
class node_ray,node_vector,node_interval,node_runtime toneRose
class node_user toneIndigo
```

## Components

### Application

- [Scene Setup](https://github.com/rongxuancheng/the_code_of_rtweekend/blob/main/src/main.cpp): `src/main.cpp`

### Rendering

- [Camera Renderer](https://github.com/rongxuancheng/the_code_of_rtweekend/blob/main/include/camera.h): `include/camera.h`
- [P3 Output](https://github.com/rongxuancheng/the_code_of_rtweekend/blob/main/include/color.h): `include/color.h`

### Scene Model

- [Object List](https://github.com/rongxuancheng/the_code_of_rtweekend/blob/main/include/hittable_list.h): `include/hittable_list.h`
- [Hit Interface](https://github.com/rongxuancheng/the_code_of_rtweekend/blob/main/include/hittable.h): `include/hittable.h`
- [Sphere Geometry](https://github.com/rongxuancheng/the_code_of_rtweekend/blob/main/include/sphere.h): `include/sphere.h`
- [Surface Materials](https://github.com/rongxuancheng/the_code_of_rtweekend/blob/main/include/material.h): `include/material.h`

### Ray Math

- [Ray](https://github.com/rongxuancheng/the_code_of_rtweekend/blob/main/include/ray.h): `include/ray.h`
- [Vector Math](https://github.com/rongxuancheng/the_code_of_rtweekend/blob/main/include/vec3.h): `include/vec3.h`
- [Intervals](https://github.com/rongxuancheng/the_code_of_rtweekend/blob/main/include/interval.h): `include/interval.h`
- [Renderer Utilities](https://github.com/rongxuancheng/the_code_of_rtweekend/blob/main/include/rtweekend.h): `include/rtweekend.h`

### Other components

- **Invoker**

## Connections

- Invoker → Scene Setup: starts (evidence: `src/main.cpp`)
- Scene Setup → Object List: assembles scene (evidence: `src/main.cpp`)
- Scene Setup → Sphere Geometry: creates spheres (evidence: `src/main.cpp`)
- Scene Setup → Surface Materials: creates materials (evidence: `src/main.cpp`)
- Scene Setup → Camera Renderer: configures and renders (evidence: `src/main.cpp`)
- Camera Renderer → Object List: queries hits (evidence: `include/camera.h`)
- Object List → Hit Interface: dispatches hit (evidence: `include/hittable_list.h`)
- Sphere Geometry → Hit Interface: implements hit (evidence: `include/sphere.h`)
- Camera Renderer → Surface Materials: scatters rays (evidence: `include/camera.h`)
- Camera Renderer → P3 Output: writes pixels (evidence: `include/camera.h`)
- Sphere Geometry → Intervals: checks bounds (evidence: `include/sphere.h`)
- Object List → Intervals: narrows hit range (evidence: `include/hittable_list.h`)
- Camera Renderer → Ray: generates rays (evidence: `include/camera.h`)
- Surface Materials → Ray: creates scattered rays (evidence: `include/material.h`)
- Ray → Vector Math: uses coordinates (evidence: `include/ray.h`)
- P3 Output → Vector Math: formats color vectors (evidence: `include/color.h`)
- Camera Renderer → Renderer Utilities: uses sampling helpers (evidence: `include/camera.h`)
- Surface Materials → Renderer Utilities: uses random helpers (evidence: `include/material.h`)