My implementation of https://raytracing.github.io/books/RayTracingInOneWeekend.html.
Saves results in a png image file and has a lot of command-line options to tweak its output.
Doesn't have any dependency and uses standard C++ 17 code only, so it should easily compile on your platform of choice.
PathTracerInOneWE [-f **filename** -t **threads** -w **width** -h **height** -s **samples per pixel** -b **max ray bounces** -fov **field of view** -cam **camera position** -look **camera look at position** -a **aperture** -focus **focus distance**]
- filename (-f): Output filename without file extension (the program will automatically add .png). Default value: "output".
- threads (-t): Numbers of threads on which to run the rendering. If samples per pixel < threads, processor utilization will not be maximized. If set to 0, will equal the number of physical threads exposed by your machine. Default value: 0
- width (-w): Viewport width in pixels. Default value: 400
- height (-h): Viewport height in pixels. Default value: 200
- samples per pixel (-s): Self-explanatory. Dramatically affects rendering time. Default value: 50
- max ray bounces (-b): Number of bounces till ray is aborted. 1 bounce corresponds to direct lightning only. Default value: 5
- field of view (-fov): A float value for the camera field of view. Default value: 90
- camera position (-cam): Three consecutive floats for the camera position. Default value: 0 0 0
- camera look at position (-look): Three consecutive floats for the point the camera is pointing at. Default value: 0 0 -1
- aperture (-a): The aperture size of the lens (float). Default value: 0
- focus distance (-focus): Any object at this distance will be in focus (float). If set to 0, will equal the distance between the camera and the look at point. Default value: 0
Example command line and resulting output:
PathTracerInOneWE -s 40 -b 50 -fov 50 -cam -2 2 -3 -look 0 0 -1 -w 1280 -h 720
Rendering time: 33s (Core [email protected] GHz)
My project uses stb_image_write.h to save the result image to png and stb_image.h to load texture images: stb (Public Domain)