Watch RayTracer

A simple ray tracer for iOS 9.0 and watchOS 2.0 written in Objetive-C.

Why?

I wanted to be the first one to run a ray tracer on a watch. It works, however it may take a while to render a single frame on the Apple Watch.

Example

Creating a scene

RTCamera * camera = [RTCamera cameraWithEye:[RTPoint pointWithX:-5.0 Y:8.0 Z:5.0] lookAt:[RTPoint pointWithX:0.0 Y:5.0 Z:0.0] up:[RTVector vectorWithX:0.0 Y:1.0 Z:0.0] fov:45.0 zvp:0.1];
    
RTBackground * background = [RTBackground backgroundWithCanvas:[RTCanvas canvasWithImage:[UIImage imageNamed:@"photosphere"]]];
    
RTMaterial * sphereMaterial = [RTMaterial materialWithAmbient:[RTComponent componentWithRed:0.1 green:0.1 blue:0.1] diffuse:[RTComponent componentWithRed:0.8 green:0.8 blue:0.08] specular:[RTComponent componentWithRed:0.98 green:0.98 blue:0.8] shininess:300.0 reflection:0.9 transparency:0.0];
    
RTSphere * sphere = [RTSphere sphereWithMaterial:sphereMaterial position:[RTPoint pointWithX:0.0 Y:5.0 Z:0.0] radius:1.0];

RTMaterial * boxMaterial = [RTMaterial materialWithAmbient:[RTComponent componentWithRed:0.1 green:0.1 blue:0.1] diffuse:[RTComponent componentWithRed:0.5 green:0.5 blue:0.5] specular:[RTComponent componentWithRed:0.8 green:0.8 blue:0.8] shininess:300.0 reflection:0.75 transparency:0.0];

RTBox * box = [RTBox boxWithMaterial:boxMaterial position:[RTPoint pointWithX:0.0 Y:4.0 Z:0.0] size:[RTVector vectorWithX:3.0 Y:0.5 Z:3.0]];
    
RTLight * light = [RTLight lightAtPosition:[RTPoint pointWithX:2.0 Y:11.0 Z:6.0] withAmbient:[RTColour colourWithRed:255.0 green:255.0 blue:255.0] diffuse:[RTColour colourWithRed:255.0 green:255.0 blue:255.0] specular:[RTColour colourWithRed:255.0 green:255.0 blue:255.0]];
    
RTScene * scene = [RTScene sceneWithCamera:camera bakground:background objects:@[sphere, box] lights:@[light]];

Rendering that scene

Rendering with anti-aliasing and more reflections

RTRayTracer * rt = [RTRayTracer niceRayTracerWithScene:scene dimension:[RTDimension dimensionWithSize:CGSizeMake(100, 100)]];

UIImage * result = [[rt trace] image];

Rendering without anti-aliasing and with less reflections

RTRayTracer * rt = [RTRayTracer fastRayTracerWithScene:scene dimension:[RTDimension dimensionWithSize:CGSizeMake(100, 100)]];

UIImage * result = [[rt trace] image];

Requires

• XCode 7.1 (iOS 9.0 + watchOS 2.0)

Developer

Fabio de Albuquerque Dela Antonio

Credits

Photo sphere by Steve Troletti