CS559
Fall 2005
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Calendar
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Lectures/Notes
Tutorials
Sample Code
Project 1
Project 2
Project 3
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CS559 Course News
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Fri, 23 Dec 2005
Grades
Either later today or Wednesday I will email everyone with their
Project 3 grade, their final exam score and grade, and their
unofficial final grade. (I am not allowed to tell you your
official final grade, only the registrar can do that).
I want to get them sent out today, but I'm not sure I will get them
all done.
Yu-Chi has the exams and the Project 3 score sheets, so if you have
questions about them, please ask me after January 8th (since I will be
traveling and he will be traveling).
Final Exam Key and Results
The answer key to the final exam is posted
here.
Mean score = 64.3 Median score = 61
I tried two grading systems: one was the "it was a hard semester, give
everyone a Holiday Gift" scale
A > 78, AB > 64, B > 55, BC > 48, low scores gvein C
The other was the "how it really should be graded" scale:
A >= 90, AB >= 80(*), B >= 65, BC >=55, C >= 51, CD >= 43,
D >= 40
In all 32 exams, only 1 person was "on the fence" so I gave them the
extra point (*).
What's amazing about this is that switching between these two grading
systems give very different final exam scores, but did not change
anyone's grades. (Actually, its not so amazing, the final
doesn't count for much. And we were very generous with the grades
for the Assignments - 2/3s of the students got As.)
So I've chosen to use the harsher scale. That way, I can feel like the
exam was graded fairly. Your exam grade indicates how well you really
did on the final. And no one's permanent record is affected.
Overall, the class grades were very good. The mean and median grade is
an AB! (I don't mind the final grades being so high - this is a hard
class, and you've all put in a lot of effort.)
Tue, 20 Dec 2005
The Final
A reminder: The final exam will be at 12:25pm on Thursday, December
22th, in room 1325 CS.
The exam is cumulative - it will cover topics from the entire course,
although there will be an emphasis on topics discussed in class after
the midterm.
A Sample Solution for HW4
Is posted here.
Note: there are some cases where I gave "more correct" answers than
the student did. For the purposes of the homework, the answers given
were fine.
And thanks to Mohamed for writing up his answers so nicely and
allowing me to share them.
Thu, 15 Dec 2005
GL Issues
Some of you have had some problems using "new" OpenGL features on the
CSL machines. Multi-texturing is one example.
The OpenGL libraries on the Storm machines should be up to date
(although, some people have had some problems that we are looking in
to). However, the header files defining the new functions are missing.
For now, you can try including the "glext.h" header in your
project. We have put a copy at
http://www.cs.wisc.edu/graphics/Courses/559-f2005/SampleCode/glext.h. There is a
chance that this might not work.
Just using a better header doesn't help. The correct solution is to
use an extension manager that determines what the driver is capable of
and provides access accordingly. If at this late of a date you're
still trying to figure this out, you're probably in trouble.
Tue, 13 Dec 2005
P3 Demo Signups
The signup sheet is posted outside of Yu-Chi's door. I will also bring
it to class on Thursday.
Articulation and P3
Just to be clear: an articulation is when two pieces of an object move
relative to one another - like a hinge. To move an articulation means
to make one piece move relative to the other. So, a windmill is an
articulated figure and having it spin around would be moving the
articulation.
Mon, 12 Dec 2005
Another Bug in the P3 Sample Code
There is a subtle bug in the P3 Sample code: If a car starts out in an
intersection, it gets confused (since the direction it leaves an
intersection depends on the direction it came from, so if it didn't
have a from direction...).
By an amazing random chance (I think its about 1 in a million), this
never happened because the random placement of cars in the example
program never put one in the intersection. If you added more cars, or
if you re-seeded the random number generator, you won't be so lucky.
The easiest solution is to avoid placing cars in intersections. I did
this by changing my "main" routine to include the following (this is
inside the loop that makes the cars):
// we need to pick a road to start on...
Road* startRoad = 0;
do {
startRoad = theRoads[rand() % theRoads.size()];
} while (startRoad->is_intersection);
new RandomDrive(c,startRoad,.2f,rand() % 2);
Late Policy for Project 3
Because of the tight timeline (projects must be graded by the end of
the semester), there will be no opportunity for "very late" projects.
All projects are due at 1pm on Friday the 16th.
For the 19 students who have turned in their previous projects on
time, there is of course no late penalty for this project (as you have
saved your one free late project for this one).
For the rest of you, we would prefer that you focused on making a good
project rather than turning it in on Tuesday morning. We will not
assess the full half-grade penalty for projects turned in between
Tuesday 9:30 (the original due date) and 1pm Friday.
In fairness to the people who have turned their previous assignments
in on time, we will take lateness into consideration into our
evaluation of Project 3. Because every Project 3 is different it is
difficult to to assign a specific number, but the penalties will
always be less than half of a letter grade.
If you prefer to turn your Project 3 in "on time" (e.g. by 9:30am
Tuesday) so it is not considered late you may. Please notify Yu-Chi as
soon as possible that you are choosing this option. Also, note that
the late penalty will be smaller than a half letter grade, so it is
probably worthwhile for you to take the extra time.
Previous grades are not be affected by this adjustment: it applies
only to Project 3.
Project 3 Grading
Will occur Friday afternoon, December 16th between 1 and 5 (more
specific details to be given later). Note: this means that no projects
can be accepted after 1pm on December 16th.
Mon, 05 Dec 2005
Course Evals
We'll do course evals in class next Tuesday (the 13th).
The lecture will be first (on computer animation) and we'll leave
some time for you to grade me.
Wed, 30 Nov 2005
Undergraduate Project Opportunities
There may be some opportunities to do graphics/visual computing projects
both within the graphics group and with other groups around campus. If
you're interested, please let us know.
Bug in GrTown Sample Code
There is a bug in the GrTown sample code. You might notice that once
the lights go on, all drawing gets messed up.
The problem is that in cars.cpp, blending is turned on to draw the headlights
but never turned off. If you insert the line of code:
glDisable(GL_BLEND);
after the "glClearColor" line in Cars.cpp in the method Car::drawAfter, things will
work correctly.
A second GrTown bug
The second bug causes the street lights not to draw, and will also
preclude any use of drawAfter in a hierarchical model. To fix it,
replace the for loop around line 108 of TownViewWidget.cpp with the
line:
drawAfterObList(theObjects,&drst);
You can also remove the declaration of the variable g (since it will
no longer be used).
Sun, 27 Nov 2005
Wed, 23 Nov 2005
Final Exam Time and Place
The final exam will be on December 22nd at 12:25pm in Room 1325 Comp Sci.
This should be a lot easier to find than the midterm room.
Mon, 21 Nov 2005
Links Broken
Links to some of the sample code (particularly for Texture Mapping) were
broken. They have been fixed.
An Issue with the GraphicsTown sample code
Note: the graphics town code is organized into subdirectories.
When you unzip it, make sure to unzip the whole archive (so you get
the proper directory structure).
Rendering Slides Available
Shaohua's slides from the rendering lecturer are available on the Lecture Notes page.
Tue, 15 Nov 2005
Project 2 Demos
Project 2 Demos will be spread out around Thanksgiving. There will be
slots: Monday the 21st (3-4:30), Tuesday the 22nd (4-5:30) and Tuesday
the 29th (4-5:30). A signup sheet will be posted by Yu-Chi's office.
Please try to sign up for one of the slots.
No Office Hours on Thursday November 17th
I will be out of town Thursday November 18th and office hours will
(therefore) be cancelled.
We will have a guest lecturer in class to talk about realistic rendering.
Project 3
Project 3 is now "officially" announced.
Mon, 14 Nov 2005
Project 3 (sortof)
A preview of project 3 has been posted (look
here.)
It is unlikely that the project description will change much, but it might.
Sat, 12 Nov 2005
A Project 2 Grading clarification
For different features that have multiple parts, sometimes the parts
do add up.
- Having both rail ties and parallel rails is worth more than having
either one, but probably not as much as having both (if it were really
amazing you could get all 17 points, but it would have to be amazing).
Just drawing a line for the rails and drawing lines for the rail ties
is a simple way to do "fancy tracks" (better is to draw polygons to
give the them some thickness).
- The other "multiple parts of one things" vary. simple physics would
be 5 points for momentum, and 5 more points for having the "ramp up".
- for multiple cars, 10 points is for having multiple cars on the
track at the same time with the correct spacing. 5 additional points
(for a total of 15) if the cars are different designs.
You should also be aware that the point values are for doing things
correctly. You will get some subset of the points for doing simpler
variants.
Wed, 02 Nov 2005
An Errata in the Curves Chapter
This is a bigger mistake that you may run into should you implement
cubic B-Splines. The matrix on page 340 is upside down (e.g. the
bottom row should be the top).
Everywhere in the chapter, I use the convention that the u
vector is [u^0 u^1 u^2 ... u^d]. Except here, so it should be fixed.
Tue, 01 Nov 2005
Calendar Changes
We have decided to change around the project and assignment due dates.
Projects 2 and 3 have been delayed 1 week. Project 2 is now due
on November 15th, and Project 3 will be due on December 13th.
Note that the due dates of the written homework assignments have been
moved up.
Project 1 Grades and Disputes
Yu-Chi will email everyone their project 1 grades. Basically, from
your demo scoresheet you can figure out what grade to expect with a
slight penalty if you didn't follow directions.
If you get your grade and it is different than what you expected, we
will explain where it came from. If you think we've made an error, we
will regrade your project, which may lead to a different result.
Similarly, if you think your exam has been misgraded, please let us
know and we'll regrade it.
Midterm Key and Grades
The answer key to the midterm is posted
here.
Yu-Chi will email everyone with their score and grade. If you'd like to
see your exam, please stop by his office.
Tue, 25 Oct 2005
Seminar of Interest
There will be a graphics seminar on Monday, October 31st at 4pm in 4310 CS that
may be of interest. The speaker is Pradeep Sen from Stanford University. He will
be speaking on "Dual Photography" - the topic of his recent SIGGRAPH paper. I
expect that the talk will be accessible to 559 students.
A Note on the Midterm - Don't Panic
Yes, the midterm was hard. Everyone thought so.
I am aware that there are some questions that were either incorrect or ambiguous.
I am also aware that the exam took much longer than I had thought. This is a problem since many
people had to leave promptly at 10:45 to get to other classes (and at least one person had to
go to another exam - YIKES!).
I haven't figured out what to do about it yet. Given all the effort that went into designing
and checking the exam (yes, there were beta-testers, and at least one of the bugs in th exam
was introduced in response to their comments), you would have thought I would have realized
that there was going to be a problem.
For the 4 people who did not show up for the exam, please confirm that you have dropped.
Mon, 24 Oct 2005
Answers to written assignment 2
Were put on the web but not linked to (oops!). They are
here.
Sun, 23 Oct 2005
Gl Tutorials
At least one student has discovered the tutorials at
http://www.xmission.com/~nate/tutors.html
and found them useful. I will try to get them installed
on the CSL machines so that you can play with them.
Fri, 21 Oct 2005
Homework 3
Written homework 3 has been posted
here.
Its not due until after the next project, however, the first 5/7ths of it
may be good practice for the exam.
Thu, 20 Oct 2005
Bezier Curves
With Bezier curves, the first derivatives are obtained by multiplying
the vector between the first two points by the degree of the curve.
I have confirmed this in 2 other textbooks, as well as by deriving the
algebra for the 2nd order case.
So, the CAPTION of Figure 15.10 is incorrect (and the literal scaling
of the little vectors that symbolize derivatives). The equations are
correct, and the text is correct.
This figure was added late in the game (it is not in the original
draft that I sent to the publisher). Still, I should have caught this
in proofreading.
(Update. I was told that this mistake was introduced at the last
minute after my last chance to proofread, so there was no way for me
to catch it.)
Tue, 18 Oct 2005
Info on the Midterm
I have made an outline of all the topics that we have covered in class
and placed it here.
I have also fixed the calendar to better reflect what we actually covered,
and to make sure that the readings actually correspond to the lectures.
Project 2
As many of you noticed, project 2 is posted. The links to it should now actually
work.
Midterm Exam
The Midterm Exam will be held in B371 Chemistry on Tuesday 10/18 at 9:30am
(it is the normal class time). The exam will be designed to take 1 hour, but
you will have the full 75 minutes. The exam is closed book/closed notes and
you should not need a calculator (you'll have to do some basic arithmetic).
All topics discussed in class (and their associated readings) are fair game.
In particular, there will be questions on curves. However, there will not
be questions about B-Splines (Section 15.6 second half), not are you responsible
for the derivations of cubic basis functions (you'll find out about these soon enough).
I expect to post a "summary" of the topics that we've discussed in class (and therefore
may appear on the exam), as well as some practice problems later this week.
Comment on Writing Assignment 2
Q1:
Please notice the equation of the convolution equation, h(t_0) =
integrate {f(t).g(-(t - t_0) }. You need to flip g(t) to g(- t) and then
shift it t_0 unit to get g(-(t-t_0)). Thus you need to transform [1 -1] to
[-1 1] before shifting it to do the convolution.
In project 1, we normally use symmetric kernel like [1 2 1] for LPF and
thus it doesn't matter whether we flip it or not. However, to do correct
convolution, you definitely need to flip the g(t) before convolution.
Q2:
The kernel coefficients must be summed up to 1 or you will increase
intensity( >1) or decrease intensity ( < 1) of the pixel. Some of you
forget to put 1/256 in front of the 5 by 5 matrix.
Mon, 17 Oct 2005
Please sign up for demos
It seems that not too many people have signed up for demos.
Please sign up soon. If you don't give a demo, we cannot grade you.
Fri, 14 Oct 2005
Sign Up for Project 1 Demos
Please sign up for a Project 1 Demo slot. The signup sheet is outside
of the door where Yu-Chi sits (1346 CS).
We really don't want to schedule more slots because people forgot to sign
up.
Thu, 13 Oct 2005
P1 Late Policy Clarification
There was a typo on the policy page that has been fixed.
Projects handed in before Friday morning at 9:30 (less than 72 hours late)
are considered late, while projects turned in after that are considered
"very late."
Because the first demo slot is Monday afternoon, no projects will be accepted
after that. The first demo is at 1:20, so make sure that you turn in a project
before then (if you intend to hand in a very late project).
A Very Cool Resource
Check out
this page at Brown University
for a variety of Java applets that are designed to help students
understand graphics concepts. There are Applets for color theory,
signal processing, ...
Highly recommended.
(this was supposed to be posted a few weeks ago, but I messed up the posting)
Signup Sheets for Project 1 Demos Posted
The signup sheets are outside of Yu-Chi's door (1346 CS). There are slots on Monday,
Wednesday, and Thursday afternoon.
Slots are 20 minutes, and we'll schedule 3 people per slot.
(The earliest slots are a little different since we alot more time
while we work the bugs out).
Mon, 10 Oct 2005
The next few assignments are posted
Assignments for the next 3 weeks have been posted on the web. You can get
to them from the calendar or the assignments page.
We have not yet posted sample code for programming assignment 5 (it will be coming
real soon now).
Thu, 06 Oct 2005
Correction on Office Hours
My office hours on the course basic information page were wrong.
It seemed that most people looked at my home page anyway (until today).
The correct office hours are Tuesday 1:45-2:30, and Thursday immediately
after class (11:00-11:45)
Wed, 05 Oct 2005
Errata in the Book
A first error caught in the book: on p. 102 in the psuedo-code, it should be
s = s + a[j] f[x-j]
(all of the i's should be j's). This should be obvious if
you understand what's going on.
Tue, 04 Oct 2005
Red Eye Examples
There are a few example red eye images
here.
More will be coming soon.
Mon, 26 Sep 2005
Project 1 Posted
Project 1 is now (pretty much) finalized. You should probably start soon.
The description is here.
The project due date is only two weeks away. Programming Assignments 2 and 3
should give you a running head start on it.
Sat, 24 Sep 2005
Project 1 Preview
A preview version of project 1 has been posted
here.
The project itself will not change much, however the web page is a
rough draft and may have typos and things that need
clarification. This should be good enough that you can get started.
I am aware that I am getting this project out late (the due date is
less than 3 weeks away). Some compensation will be made.
Email Issues
In class, we determined that there is an issue with email.
The class mailing list will deliver to your wiscmail accounts,
but all "personal" correspondence (such as yu-chi sending you
your grades for assignments) are sent to your CS email account.
If you don't read your CS email account regularly please (1) check it
to make sure you have gotten email from yu-chi about your written
homework 1 and program 1 grade and (2) arrange to forward your CS
email to your wiscmail account. To do this, go to
www-auth.cs.wisc.edu, got to the web forms page, then go to the email
preferences page.
If you have not received your W1 and A1 grades (as email to your CS
email account), please send a note to yu-chi.
Thu, 22 Sep 2005
PA1 & Forward CS e-mail
I have sent out my comment about PA1 to those who did not have enough
contribution information or did not handin enough files for me to run it.
If you did not receive anything, you did a good job in PA1.
Because part of you may not use the CS e-mail, you need to set up the
e-mail forwarding for your CS e-mail account.
Here is
the CSL document about how to set up the forwarding.
Mon, 19 Sep 2005
Misleading directions on program handins
Yu-chi told some of you that you need to turn in a ".suo" file when you
hand in a project. I told everyone that you didn't (in the program description).
So, don't worry about it: if you turn it in, its OK, if you don't, its OK.
Your solution file ".sln" and project files ".vcproj" are necessary.
Sat, 17 Sep 2005
Issue with Tutorial ZIP files
The issues witht the tutorial ZIP files have been fixed (we believe).
There have been some minor typos fixed in the tutorials as well. All
the changes have been minor.
Wed, 14 Sep 2005
Lecture Notes Ahead of Class
I have put up my notes (as power point slides) for tomorrow's lecture.
Given how little time there is, I'm not sure how valuable they will be,
but I want to try it. I will try to get more than 1 day ahead.
Tue, 13 Sep 2005
Key for HW1 Posted
An answer key for homework 1 is posted
here.
The error in the solution to Question 4 has been corrected.
Note: it is less important that you got all the right answers than that you have
the intuitions and concepts. What we wanted to ask you on the homework was
do you understand what the (determinant, cross product, ...) means?
It will be important to be able to use these concepts later in the class.
If you had no idea how to do the homework because you don't understand the basic
linear algebra concepts, things might get pretty hard for you later in the
class.
Lecture 3 Notes Posted
Lecture notes for Lecture 3 are posted. I am trying to get far enough
ahead to make lecture notes (at least a draft of them) available
a day or so ahead of the lecture.
Mon, 12 Sep 2005
Week 2 Readings
This week, we'll cover a variety of topics that fall under
the category of "Basic Image Processing."
The assigned readings are the first part of Chapter 3 (for
Tuesday) and Chapter 4 (assigned for Thursday). You should have
seen this in the calendar. It is OK to read these after the lecture
as they will present the same material in a slightly different way.
In particular, give yourself plenty of time with Chapter 4 - it covers
a lot of material.
Programming Assignment 1
Programming assignment 1 has been posted on the
assignments
page. Some tutorials to help you get started have been posted on the
tutorials
page. If you look carefully, you'll see that Tutorial 4 is a solution to
programming assignment 1.
Sun, 11 Sep 2005
Update to Homework 1
A very minor update was made to Homework #1. Due to a typesetting error,
the dot for the dot product didn't show up right. Also, a clarification:
the "n" and "p0" in 5C are the same variables as in other parts of the question.
I don't think this should effect anyone, but a student did point out these
ambiguities, so I fixed them.
Thu, 08 Sep 2005
Lecture Notes Available
As an experiment, I am trying to do my lecture notes
(my notes to myself) in a form that might be useful to someone
else. I've put the 2nd days lecture (9/8)
online.
Feedback on this experiment is most welcomed.
Wed, 07 Sep 2005
Written Assignment 1 Posted
Written Assignment 1 is posted here.
It is due on Tuesday, September 13th in class. (but you knew that from
the course
calendar)
Web Issue Fixed
Some of you might have noticed that there were issues with the course
web site (such as, all of the links being broken). I believe that
these issues are now fixed. If not, please let me know.
Mon, 05 Sep 2005
Readings for 9/6 and 9/8
As you've hopefully noticed from the course
Calendar
there are readings assigned for the first two days of class.
For 9/6, the reading assignment is the first Chapter of Shirley's
book. This reading is not required for the lecture (notice that it is
listed as *S1* in the calendar), but you should read it sometime soon.
For 9/8, the reading is the first part of Chapter 21 of Shirley's book
(the entire Chapter is optional).
CS559 Announcements Page
This is the course announcements page for CS559. The rest of the course web
pages are slowly being put into place. Most things are still subject
to change.
Yes, I know that This initial entry gets repeated as being from 1969 -
it's a bug in the web page generation software that I haven't yet
figured out.
News Pages: [ 1 ]
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