miniRT

Project at 1337. A minimal raytracing engine wrote in C and MiniLibX.

Index

Description
Raytracing
Installation
Definitions
Images
Ressources

Description

Summary: This project is an introduction to the beautiful world of Raytracing. the miniRT is my first ray tracer coded in C, normed and humble but functionnal.

Raytracing

Ray tracing is a rendering technique that can produce incredibly realistic lighting effects. Essentially, an algorithm can trace the path of light, and then simulate the way that the light interacts with the virtual objects it ultimately hits in the computer-generated world.

Installation

The scene must be correctly formatted.
This project is using the Minilibx using the Metal framework and therefore should work only on macOS 10.13+.
You should follow this guide if you want to compile it on Linux.

Clone the repo:

https://github.com/Xperaz/minirt.git

cd into it and run make bonus to compile it:

cd minirt && make bonus

Now try some tests:

./miniRT_bonus ./maps/aladin_room.rt

There are some scenes in the maps folder that showcase minirt.

Definitions

Ambient lighting: A {ratio} {color}

Ambient lighting ratio in range [0.0,1.0].
R,G,B colors in range [0-255].

Camera: C {position} {orientation} {FOV}

X,y,z coordinates of the view point.
A vector with the the x,y,z axis in the range [-1,1].
Horizontal field of view in degrees in range [0,180].

Light: L {position} {ratio} {color}

X,y,z coordinates of the light point.
The light brightness ratio in range [0.0,1.0].
R,G,B colors in range [0-255].

Sphere: sp {position} {diameter} {color}

X,y,z coordinates of the sphere center.
The sphere diameter.
R,G,B colors in range [0-255].

Plane: pl {position} {orientation} {color}

X,y,z coordinates.
A vector with the the x,y,z axis in the range [-1,1].
R,G,B colors in range [0-255].

Cylinder: cy {position} {orientation} {diameter} {height} {color}

X,y,z coordinates for the cylinder center.
A vector with the the x,y,z axis in the range [-1,1].
The cylinder diameter.
The cylinder height.
R,G,B colors in range [0-255].

Cone: {position} {orientation} {diameter} {height} {angle} {color}

X,y,z coordinates for the cone center.
A vector with the the x,y,z axis in the range [-1,1].
The cone diameter.
The cone height.
the tangent of half angle of the cone.
R,G,B colors in range [0-255].

Example maps/columns.rt file:

A 0.2      255,255,255

l     -12,7,-10      0.6      255,255,255
l      12,7,-10      0.6      255,255,255
l      0,7,-10      0.6      255,255,255

C     0,5,-14      0,0,1      70

sp      0,1,-1      1.2          125,25,25

cy      -5,0,-2      0,1,0      2.8     20        140,140,140

cy      -5,0,10      0,1,0      2.8     20         140,140,140

cy      5,0,-2      0,1,0      2.8      20         140,140,140

cy      5,0,10      0,1,0      2.8      20        140,140,140

sp      -5,0,10      4.2         140,140,140

sp      5,0,10      4.2                140,140,140

sp      -5,0,-2      4.2         140,140,140

sp      5,0,-2      4.2          140,140,140

sp      -5,10,10      4.2         140,140,140

sp      5,10,10      4.2         140,140,140

sp      -5,10,-2      4.2         140,140,140

sp      5,10,-2      4.2         140,140,140

pl      0,0,0      0,1,0            104,104,104      

pl      0,0,16      0,0,-1           25,25,178      

pl      0,10,0      0,-1,0            128,0,0

Images

Ressources

https://www.gabrielgambetta.com/computer-graphics-from-scratch/basic-ray-tracing.html
https://www.youtube.com/watch?v=1HYhrx9bzP8
https://computergraphicsguide.blogspot.com/2015/08/raycasting-and-phong-shading.html
https://www.youtube.com/playlist?list=PLAqGIYgEAxrUO6ODA0pnLkM2UOijerFPv
http://hugi.scene.org/online/hugi24/coding%20graphics%20chris%20dragan%20raytracing%20shapes.htm
https://www.youtube.com/watch?v=gGKup9tUSrU&ab_channel=CemYuksel
https://www.scratchapixel.com/lessons/3d-basic-rendering/introduction-to-ray-tracing
http://raytracerchallenge.com/
https://mrl.nyu.edu/~dzorin/rend05/lecture2.pdf
https://mrl.nyu.edu/~dzorin/rend05/lecture1a.pdf
https://mrl.nyu.edu/~dzorin/rend05/

Xperaz/minirt

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