COSC342代做、代写ray tracer、代写Python，Java编程语言、c/c++程序代做

日期：2019-05-18 02:25

COSC342 Assignment 2a

Due: 11:59pm, Monday 20th May 2019

Building a ray tracer

For this assignment you are asked to write parts of a ray tracer. Starting code

for this assignment is available on Blackboard. You must use the skeleton

code and only modify the clearly indicated sections of the project.

We will mark your assignment against a reference implementation, so that we

can independently test different elements of your code.

1. Starting with the skeleton program that we have provided, write and test

routines that ray trace and shade the objects in the scene, meeting the

requirements below. The skeleton program defines the required user interface,

reads scene information from a file, and sets up many useful data

structures. The format of the scene files and the functions and methods

provided in the skeleton code are documented online.

2. Test your program with our sample files (text files in the skeleton code)

and with scenes of your own design. Choosing appropriate test cases is

part of the assignment.

3. Write a short report, describing how your program works and how you

tested it. Describe any known flaws in your program.

4. Submit through Blackboard:

The source code for your solution to the assignment.

A sample image file and the scene description file to generate it.

A short report as a PDF file. (This should usually be up to two pages

in length, and should not be more than three pages long.)

We only need the files you have modified, as we will be testing them in

that framework. Please DO NOT Submit:

Build directories, executables, or intermediate object files

Source control files or operating system generated files (e.g. .DS_Store

from OS X)

The default late penalties of 10% per working day apply.

1 of 2 v1.0

Requirements for your ray tracer

We require that you complete the following tasks within the structure of the

skeleton code provided. Some of these will be covered in labs.

1. The skeleton provides only ambient lighting. You should add Lambertian

(diffuse) and Phong (specular) illumination.

2. Implement shadows and mirror reflections.

3. Implement rendering for Plane, Cube, Cylinder, and Parabaloid objects.

4. Implement illumination from DirectionalLightSources and SpotLightSources.

See the code documentation for more detail on the required components.

Note that the scene file parser already recognises syntax relevant to the above

tasks. The skeleton code is designed to provide you with implementation hints,

and to allow you to focus on the graphics implementation required. See the To

Do list in the documentation for information about which methods you need to

update.

Marking scheme

4 marks Report, with an emphasis on testing.

2 marks Your sample scene image and associated scene description file.

1 marks Diffuse (Lambertian) shading.

1 marks Specular (Phong) shading.

2 marks Shadows correctly cast by objects.

2 marks Mirror reflections correctly computed.

1 mark Correct rendering of planes.

1 mark Correct rendering of cubes.

2 marks Correct rendering of cylinders.

2 marks Correct rendering of parabaloids.

1 mark Correct lighting from spotlights.

1 mark Correct lighting from directional light sources.

Note that many of the components are independent. For example, you could

complete diffuse shading, shadows, and cube rendering without cylinders, specular

reflection, or mirror reflections. However, it may be difficult to test if your

object normals are correct with just ambient lighting.

Final notes

Remember this is an assignment in graphics, not in production programming.

You will not get any extra credit for extravagant solutions. High marks will

be given for a well explained solution that is easy to follow. Programs must be

commented of course, but no more than necessary for us to be able to understand

them.

You may discuss conceptual issues relating to this assignment with others,

but all the work you hand in must be your own, except for the parts of the given

skeleton program.

2 of 2 v1.0