CS 488 Ray Tracer Project

Objective 1: New Primitives

I added two new primitives: cylinders and cones.

Objective 2: Constructive Solid Geometry (CSG)

First row: difference

Second row: union and two differences on the same primitive

Third row: intersection

Objective 3: Texture Mapping

Objective 4: Refraction

Objective 5: Soft Shadows

Objective 6: Reflection

Objective 7: Perlin Noise

Objective 8: Depth of Field

Objective 9: Uniform Spatial Subdivision

Results for 8 threads and 4096 voxels (on the macho cows scene):

	With no optimizations	No subdivision, with bounding boxes	With subdivision, with bounding boxes
Real	> 2m45.648s	0m46.611s	0m33.821s
User	> 20m27.353s	3m5.321s	2m8.716s
Sys	> 0m2.371s	0m0.365s	0m0.170s

We can see that subdivision provides roughly a 40% increase in speed.

Objective 10: Final Scene

Bonus Feature: Multithreaded Rendering

n is the number of threads (Tests performed on a quad-core early 2013 Macbook Pro)

	n=1	n=4	n=8	n=16	n=32
Real	1m55.321s	1m5.880s	0m40.337s	0m32.612s	0m30.009s
User	1m55.245s	2m4.765s	2m34.474s	3m17.845s	3m43.431s
Sys	0m0.071s	0m0.089s	0m0.180s	0m1.181s	0m1.191s

We can see that the effective real time decreases as we increase threads, with no significant gain around 16 threads.