代写COM6503、代写Java/Python程序

日期：2022-11-13 11:50

COM6503: 3D Computer Graphics: Assignment

Dr Steve Maddock

Deadline: 3pm, Wednesday 7 December

1. Introduction

The assignment involves using modern OpenGL to render a scene. Scene graphs are required in the modelling

process and animation controls are required for hierarchical models.

Learning outcomes: After completing this assignment, you will be able to:

Use data structures and mathematics in representing and manipulating 3D objects

Produce interactive software that makes use of a graphics API

Figure 1. The scene

A window as big as the wall.

There is a cloudy sky outside.

The view is changing over time.

Should this be a texture on a

polygon at a certain distance or

should it be a skybox?

Egg-like object on a rectangular base on

a table. The egg-like object has both matt

and shiny parts. The egg occasionally

rotates and jumps.

Anglepoise lamps can adopt different

poses to point their heads in different

directions. The square LED bulb in a

lamp’s head functions like a spotlight in

the scene. I’ve shown one in yellow to

highlight it.

Desk, floor and walls

need texturing, e.g.

wood, wallpaper, etc

Each anglepoise lamp is a slightly

different size and has some

different pieces attached to it.

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2. The scene to create

A company is creating an advert for a range of new

angle-poise lamps that look like alien animals. Your task

is to create a scene for this.

Figure 1 shows a room scene containing a table, an egg-

like object, two anglepoise lamps and a window looking

out onto a view. The whole scene can be modelled using

transformed planes, cubes and spheres.

The lamps are inspecting the egg. The base of each lamp

is fixed, but each lamp can each articulate its joints so

its head points in different directions. The egg-like

object occasionally jumps and twists (rotates), as

though there is something inside trying to get out.

3. Requirements

You must satisfy all the following requirements.

3.1 The room

Three walls and a floor for the room should be

modelled.

The walls and floor should be texture mapped to look

like a meeting room. For example, the floor could be

made of wood. The walls should have a texture

pattern on them.

3.2 The window

The back wall in the room is a large window.

An outside scene can be seen through the window,

for example, this might be a garden scene or a city

scene or some advertising text (e.g. “new alien animal

anglepoise lamps”) that scrolls past the window.

Consider how you might do this:

o Should the scene be a texture map pasted onto

the wall to look like a fake window and a scene?

o Or should there be no wall and instead a texture

map pasted onto another surface that is a certain

distance outside the window (as illustrated in

Figure 1)? Should there be a small frame for the

window?

o Or should a skybox be used that is outside the

whole room?

Depending on the approach you choose, how does it

look when the camera moves position in the room

when looking out of the window? (Is it possible to

stand in the room and not see the scene outside

through the window?)

The scene outside the window should change whilst

the program is running, e.g. the clouds might move.

The quality of what you produce for this part of the

scene will be part of the marking.

3.4 An anglepoise lamp

The hierarchical model of a basic angle-poise lamp

should be made up of five parts: a base, a lower arm,

an upper arm, and a head, which contains a

protruding lightbulb (a nose) in the shape of a cube

(the details of the lighting technology used are not

important). There are also some additional pieces –

see below.

The lamp base is in a fixed position in the room. (If

you wish, you can animate the base to move a little

bit, e.g. slide around, but this is not required for the

assignment.)

Three parts of the lamp can articulate as illustrated in

Figure 2. The lower arm can rotate about the

connection point with the base in two directions (in a

circular way, and the lower arm can also articulate

with respect to the base like an elbow joint), the

upper arm can rotate about the lower arm (again, like

an elbow joint) and the head can rotate about the

upper arm (again like an elbow joint).

The lightbulb shines in the same direction that the

head is pointing in.

There should be some decorative pieces that make

the lamp look unusual or like an animal (see Figure 2).

Do not just copy the decorative pieces used in Figure

2; invent your own pieces. For example, you might

make the ears more interesting, or add pointy hair, or

horns, or a larger nose, or a different tail.

Use simple objects for the individual parts, i.e. scaled

spheres or cubes. For example, in Figure 2, the head

is made from a combination of a cube for the lamp

head and a cube for the bulb, with some other cubes

and spheres for the decorations. Cubes and spheres

are the only pieces needed to model the lamp. The

hierarchy and associated transformations are more

important than the quality of the pieces in the

hierarchy. I want you to demonstrate that you

understand transformations and a scene graph

hierarchy.

The pieces of the lamp must be texture-mapped. For

example, you might decide to make the pieces spotty

Figure 2. A model of an angle-poise lamp

that looks like a strange alien animal.

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to look like a particular animal. As another idea, you

might texture map a picture of feet onto the base.

The head of the lamp must include an object (e.g. a

nose bulb), modelled as a cube or sphere, which

mimics the effects of a spotlight. The object gives the

position of the spotlight and the orientation of the

head gives the direction the spotlight is pointing in.

The spotlight will thus illuminate the scene in the

direction the lamp head is pointing in. (The dotted

lines in Figure 2 are just to illustrate the direction the

spotlight is pointing in.) There must be an option in

the interface to turn the spotlight (and look of

associated object) on and off. (You are responsible for

working out how to implement a spotlight effect –

read the relevant section in Joey’s online tutorial.)

3.6 The large egg-like object

The egg-like object can be made using a cube for the

base and a sphere for the egg-like part.

The egg should be texture mapped with matt and

shiny parts. (Hint: diffuse and specular maps.) Figure

1 shows a pattern with shiny spots, but a different

pattern would also suffice.

3.7 General illumination

The scene should be illuminated with at least two

general world lights which can be positioned

anywhere in the world.

These general world lights will illuminate all parts of

the scene and help visualise the scene during

development and testing.

When you switch off the general light(s), the effects

of the spotlights on the anglepoise lamps will be

much clearer.

You do NOT have to do shadows. Do not worry about

shadow effects.

3.8 User interface

A user-controlled camera should be positioned in the

scene. Use the camera that was given in the tutorial

material – the mouse can be used to change the

direction the camera is pointing in, and the keys can

be used to move about. Do not change the key

mappings from the ones in the tutorial. If you change

the key mappings, it will make it difficult to mark. It

doesn’t matter that the camera can move and see

outside the room.

It should be possible to turn each of the general lights

on and off (or dim, i.e. reduce the intensity) from the

interface.

It should be possible to turn each spotlight (lamp

bulb) on and off.

There should be buttons to move each anglepoise

lamp into three different poses, so six buttons to do

this (three for each lamp). One pose for each lamp is

its default, looking at the egg. The other two poses

for a lamp could be anything, e.g. looking at the other

lamp or looking under the table or looking towards

the window. However, these poses should be

obviously visually different for each lamp.

3.9 Animation

This requirement is advanced and you may decide not

to do this part, although you would not be able to get

full marks.

Each lamp should smoothly animate between its

poses rather than immediately transition from one

pose to another pose.

It is perfectly acceptable to animate the Euler angles

to achieve movement of the hierarchy. Do not

consider using quaternions, as this is beyond the

requirements for this assignment.

4. Deliverables

You should submit a zip file containing a copy of your

program code (and any other necessary resources,

e.g. image files for the textures and a readme.txt file

that describes everything) via Blackboard – this can

be done via the link to the assignment handout.

You should submit whatever you have done, even if

you have not completed all the requirements – for

example, you might have produced a model of the

room and a single lamp, but not done two lamps or

the different lamp poses or animation. If you submit

nothing, you cannot receive any marks.

The program MUST compile and run from the

command window on a Windows PC or the terminal

window on a Mac. You should assume that the jogl

environment (and paths) has already been set up, so

you do not have to include this as part of what you

hand in. I won’t install ‘YetAnotherIDE’ to make your

program work; I want to run the program (and, if

necessary, check the compilation) from a command

(or terminal) window.

You must include appropriate comments in your

program to identify that you wrote the code, e.g.

/* I declare that this code is my own work */

/* Author address here> */

You can make use of all the code that I have given you

in the tutorial material. However, use your comments

to state which bits are new.

The body of the Blackboard submission message

should state that the work you have handed in is your

own (except for the bits I supplied).

The name of the main class in your program should

be Hatch. That way it is easy for me to run the

program. (In previous years, I have wasted time for

some handins trying to work out which was the main

class to run.) It would be useful to include a

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batch/script file to automatically compile and/or run

the program.

Optional: You might like to make a short video of your

animation. If you do so, DO NOT include this in the

handin as it will be too big for Blackboard to handle –

we tried using Blackboard for this in the past and it

crashed the system!! Instead, put the animation on

youtube or your personal website and give the URL of

the animation in a readme.txt file. Indeed, if you are

thinking of a career in the graphics industry, then you

should be adding such animation pieces to your

personal website (your digital portfolio) to show off

what you are capable of.

5. Marking

I will check that the program meets the requirements

listed above. To make sure you get some marks, the

program must compile and do some part of the work

requested even if it is not complete. Your program will

be run and exercised thoroughly.

Marks will be available for:

The quality of the programming (10%)

Satisfying the requirements (90%)

In assessing the quality of your program code, the

following aspects will be considered: general neatness

and organisation; use of data structures, classes and

functions; organised scene graphs; animation flexibility.

In considering the requirements, four aspects will be

considered (including the quality of the work):

(24 marks) Modelling the scene: each anglepoise

lamp must be a hierarchical model. (Consider drawing

scene graphs before starting to program.)

(24 marks) Texturing: Use of texture mapping in the

scene, e.g. basic texture mapping, use of diffuse and

specular textures, extra texturing effects such as the

changing window view.

(18 marks) Lighting and interface controls: lights

should behave correctly such that their effect is seen

on the scene. Necessary interface controls, as

described in the above specification, should also be

included.

(24 marks) Lamp pose control and animation. Are all

the poses produced and distinct? Is the animation

plausible and smooth?

6. Unfair means

The Department’s student handbooks (UG and PGT,

see below) give detailed information on the topic of

unfair means and what happens if unfair means is

used.

Some students in previous years have placed

solutions of their assignments on their personal

world-readable websites – where possible, they have

been asked to take these down. Be careful you are

not attracted to these, as using any of their code

would be regarded as use of unfair means – this has

happened in previous years and students have failed

the module as a result of doing this.

7. Late submission

Standard Department rules will be applied if the work

is handed in late – see UG and PGT handbooks below.