C++ / OpenCL Ray Tracer

C++ / OpenCL Ray Tracer based on Peter Shirley's Ray Tracing in One Weekend

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Usage

The ray tracer function is contained in the RayTracer.h file.

To initialize a ray tracer, create a new instance: RayTracer* tracer = new RayTracer(DIMENSIONS, QUALITY, CAMERA)^†.

†: Camera setting is optional

Then, set the camera parameters for the output image (only necessary if not initialized in first step): tracer->SetCamera(...).

Next, use the following format for each object in the render: tracer->AddItem(new OBJECT).

Then, call the render function to output an image: tracer->Render(FILENAME) or tracer->clRender(FILENAME).

Use Render() to render in C++ on the CPU or clRender() to render in OpenCL on the GPU.

Finally, destruct the instance: delete tracer; or ray_tracer->ClearItems();.

Optionally, you may display the performance data or automatically open the image in the default image viewer by calling: ray_tracer->ShowPerformance(); or ray_tracer->OpenImage();

Example:

#include "ray_tracer.h"

int main() {

	RayTracer* tracer = new RayTracer({ 200, 100 });
	tracer->SetCamera(Vector3D(10, 0, 0));
	tracer->AddItem(&Sphere(Vector3D(0,0,0), 1, new Dielectric(1.3)));
	tracer->Render("ImageName");
	delete tracer;

	return 0;
}

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Variable Descriptions

• OBJECT:
  • Sphere:
    • Description: Sphere Object
    • Format: Sphere(Vector3D(LOCATION), SIZE, MATERIAL)
    • Example: Sphere(Vector3D(0), 1, new Lambertian(Vector3D(0.51, 0.7, 1.0)))
  • Box
    • Description: Box Object
    • Format: Box(Vector3D(BOUND1), Vector3D(BOUND2), MATERIAL)
    • Example: Box(Vector3D(-1), Vector3D(1), new Lambertian(Vector3D(1, 0, 0)))
• LOCATION: (X,Y,Z) location of object (double).
• SIZE: Sphere radius (double).
• MATERIAL:
  • Lambertian
    • Example: new Lambertian(Vector3D(COLOR)).
    • COLOR: (R,G,B) color value, 0.0 - 1.0 (Vector3D).
  • Metal
    • Example: new Metal(Vector3D(COLOR), FUZZ).
    • COLOR: (R,G,B) color value, 0.0 - 1.0 (Vector3D).
    • FUZZ: Fuzz / Blur Level, 0.1 - 1.0 (double).
  • Dialectric:
    • Example: new Dielectric(REFIDX).
    • REFIDX: Refractive Index. Recommended 1.0 - 2.4 (double).
• DIMENSIONS: Output image size in pixels. Width x Height (SDims).
• QUALITY: Number of rays per pixel (double).
• CAMERA
  • Format: Camera(DIMS, LOOKFROM, LOOKAT, UP, APERTURE, FOV)
  • Example: Camera(dims, Vector3D(3, 1, 3), Vector3D(0, 0, 0), Vector3D(0, 1, 0), 0.1, 30)
  • DIMS: Output image size in pixels. Width x Height (SDims).
  • LOOKFROM: (X,Y,Z) location of camera (Vector3D).
  • LOOKAT (Optional): (X,Y,Z) location where camera is pointed (Vector3D).
  • UP (Optional): (X,Y,Z) location of camera y-shift (Vector3D).
  • APERTURE (Optional): Camera lens aperture (double).
  • FOV (Optional): Camera lens field of view in degrees (double).
• FILENAME: Name for ouput ppm file. Do not include .ppm (string).

Note: Vector3D can be intialized with one or three paramaters. If one paramater is supplied, all three will use that value. i.e: Vector3D(1) == Vector3D(1,1,1).