CSCI 5607 Assignment 2 -Ray Tracing (Part1– Rays,Lights & Spheres)


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In this assignment, you will create a simple ray-tracing application capable of
rendering scenes consisting of spheres lit by point light sources. Scenes will be
described in a simple, easy to parse text specification file. This is part 1 of a two-part
assignment. In the second part you will extend this raytracer to incorporate triangle
meshes, more complex lighting, and other extensions for more realistic images.

Getting Started:

You already have the stb_image_write.h library from HW1. You can use
this to create BMP outputs. You may also wish to use SDL or GLFW to create an
interactive UI for displaying and modifying your scenes. All other code you should
write from scratch.

A simple scene format has been posted online [], this
contains information on the camera, all objects, lights and materials in the scene,
and output formats. You may need to extend it to implement new features, but be
sure you can also support existing files in this format. We have uploaded some
scenes consisting of only spheres to get you started []. NB:
My rendering of these scenes contains some features such as reflection and
refraction, which you do not need to implement until Part 2.

Submission Instructions:

Create a sample webpage with:
-Your source code
-Output images
-You must show at least one of the sample scenes along with several new
scenes of your own designed to show off each feature of your raytracer.
-Brief description of your implementation, any issues you saw, and a list of
any extra credit tasks you attempted
-Submission to Art Contest (optional)

Assignment Requirements:

As this is a two-part assignment, Part 1 will be graded out of 50 pts. The
number is front is how many points the feature is worth. Partial credit will be given
to features that “mostly” work. The required minimum feature set is underlined.
Scene Setup:
(5) Camera placement, film resolution, aspect ratio
(5) User specified background colors
(5) UI + OpenGL output
(5) BMP or PNG output
(5) Spheres
(5) Difference/Intersection of spheres (Constructive Solid Geometry)
(5) Ambient lights
(5) Point light sources
(5) Shadows
(5) Multiple light sources
(5) Directional light sources
(5) Spot light sources
(5) Basic Sampling
(5) Jittered Supersampling
(5) Adaptive Supersampling
(5) Motion Blur
(5) Depth of Field
(5) Color & Specularity (Phong Lighting Model)
(5) Refraction
(5) Reflection


-Test your program incrementally
-Try hard to test incrementally
-Honestly, incremental testing will really help!
-By testing incrementally I mean, you should get some very small thing
working first then move on to more complex features. First generate a black image
of the correct dimensions. Then create a scene with just a sphere. Have your
raytracer return white whenever it hits the sphere. You should see a white sphere
on a black background. Now make sure you feel confident in your ray/sphere
intersection code. Move the sphere around, make sure the right results happen.

When this works, mess around with the image aspect ratio (make it very narrow),
make sure everything works as expected. Then instead of coloring the sphere white
use the real material color. Then add support for point lights, then phong shading.
Only move on to a new feature when you’re sure everything else works so far.
-If you don’t do this, you’ll end up with a big pile of broken code and neither I
nor the TAs will be able to help you.
-Test incrementally
-Please, please test as you go along!
-See the posted HW2 strategy guide