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<h1 align="center" style="font-size: 4rem; margin-bottom: 0.5rem"> RT_GPU </h1>
<p align="center">
<img src="assets/sponza_image.png" alt="Raytracer Screenshot" width="90%" style="border-radius: 8px;">
</p>
<p align="center">
<b>🌌 Real-Time GPU Raytracing Engine</b>
<br>
</p>
<p align="center">
<video width="80%" controls>
<source src="assets/sponza.avi" type="video/mp4"> Your browser does not support the video tag.
</video>
</p>
## 1. Introduction
### 🎯 Project Description & Purpose
@ -133,16 +150,16 @@ void main() {
### 🔷 Supported Primitives
Our RT comes with a variety of built‑in geometric primitives, each traced mathematically in the compute shader:
| Primitive | Description & Notes | Preview |
| ---------- | --------------------------------------------------------- | ----------------------------------- |
| **Cube** | Axis‑aligned cube. | `![Cube](assets/cube.png)` |
| **Cylinder** | Finite cylinder with end caps; parameterized by radius, height and rotation. | `![Cylinder](assets/cylinder.png)` |
| **Plane** | Infinite plane defined by a point & normal. | `![Plane](assets/plane.png)` |
| **Portal** | Any paired "windows" implementing non‑Euclidean teleportation. See "Advanced Features" below. | `![Portal](assets/portal.png)` |
| **Quad** | Rectangular object useful for billboards or area lights. | `![Quad](assets/quad.png)` |
| **Sphere** | Round object useful for sphere light. | `![Sphere](assets/sphere.png)` |
| **SpotLight** | Directional point with cone angle, used for volumetric scattering. | `![SpotLight](assets/spotlight.png)` |
| **Triangle** | Single triangle, primitive building block for custom meshes and SAH‑BVH traversal. | `![Triangle](assets/triangle.png)` |
| Primitive | Description & Notes |
| ---------- | --------------------------------------------------------- |
| **Cube** | Axis‑aligned cube. |
| **Cylinder** | Finite cylinder with end caps; parameterized by radius, height and rotation. |
| **Plane** | Infinite plane defined by a point & normal. |
| **Portal** | Any paired "windows" implementing non‑Euclidean teleportation. See "Advanced Features" below. |
| **Quad** | Rectangular object useful for billboards or area lights. |
| **Sphere** | Round object useful for sphere light. |
| **SpotLight** | Directional point with cone angle, used for volumetric scattering. |
| **Triangle** | Single triangle, primitive building block for custom meshes and SAH‑BVH traversal. |
> 📌 *Each primitive stores its own transform (position, rotation, scale) and material index; the compute shader branches on `obj.type` for intersection tests.*
@ -156,8 +173,8 @@ Materials in RT are defined by a compact struct in C++ and mirrored in GLSL for
typedef struct s_Material {
glm::vec3 color; // Base albedo
float emission; // Emissive strength
float roughness; // [0=mirror … 1=matte]
float metallic; // [0=dielectric … 1=metal]
float roughness; // [1=mirror … 0=diffuse]
float metallic; // [probability of reflecting]
float refraction; // IOR for transmissive materials
int type; // 0=Lambert,1=Dielectric,2=Transparent,3=Checker...
int texture_index; // Albedo texture lookup
@ -227,6 +244,12 @@ Our RT uses [stb_image](https://github.com/nothings/stb/tree/master) to load 2D
### 🌌 Non‑Euclidean Portals
Portals link two planes in space, allowing rays (and the camera) to teleport seamlessly.
<div align="center">
</div>
#### **GLSL**: portalRay()
```glsl