This is a small modular raytracer written in C++. Along with the usual suspects, it includes SSE optimized sphere intersection calculation, raymarched implementation of the mandelbulb fractal and a portable JSON scene representation format.
To compile and run the raytracer locally, first install nlohmann/json and then execute the bash file:
run.shTo run in interactive mode, also install SFML/SFML and instead execute the bash file:
run_interactive.shIn interactive mode, press Enter to double the sample count, WASDQE to move the camera origin and IJKLUO to move the selected object.
Scenes are described in a JSON format:
(full example config.json)
{
"width": 500,
"height": 250,
"fov": 60,
"aspect_ratio": 2,
"cam_origin": [0.0, 0.0, 0.0],
"cam_at": [0.0, 0.0, -1],
"cam_step": 0.05,
"move_step": 0.05,
"sky_gradient": [[0.0, 0.0, 0.0], [0.0, 0.0, 0.0]],
"n_threads": 4,
"samples": 10,
"max_bounces": 50,
"fog_factor": 0.2,
"objects": [
{
"type": "sphere",
"pos": [-0.6, 0.0, -2.0],
"radius": 0.5,
"props": {
"smooth": 0.0,
"color": [0.8, 0.2, 0.2],
"glow": 0.0,
"reflect": 0.5
}
},
...
{
"type": "cuboid",
"pos": [0.0, -0.5, -2.25],
"w": 0.25,
"h": 0.25,
"d": 0.25,
"props": {
"smooth": 0.0,
"color": [0.2, 0.4, 0.8],
"glow": 0.0,
"reflect": 0.5
}
}
]
}