I'll put course announcements here rather than in Virtual Office Hours.
Please check here frequently, clicking on Reload to make sure you
see a current copy of this page.
(6/7) I had said that I'd post the labs by today, but that has
not yet been done. The homework posted does reflect what we think
we have. Late homework will still be accepted.
(6/3) On DD-9, the explanation of rotating the viewplane is for
row vectors, so it is transposed from the explanation in class.
(6/3) This is a little late, but for lab 3, on p. AA-8 of the
handout of Handout AA, in the middle, I notice that the comment about
the output would have been more complete if it included an end-of-line.
(6/3) Our TA Feng will have an extra discussion section for review
this Thursday, 1:00-2:00 in MS 6627.
(6/3) Problem DD-7 mentions some points in "homogeneous
coordinates", which we aren't covering. These have four numbers
instead of three. They are easy to interpret, though: A
quadruple with 0 as the fourth number means that the first three
are a vector, giving a direction for parallel rays (so the
projection is one of the two parallel possibilities). A
quadruple with 1 as the fourth number means that the first three
are an ordinary point (so the projection is perspective). For
example, (5,5,5,0) h means the direction vector
(5,5,5), while (5,5,5,1) h means the point (5,5,5).
(6/3) As announced in class, Assignment 9 can be handed in Friday
instead of Wednesday.
(5/23) In Problem DD-3, don't worry about subclassifications.
(5/23) Although Lab 3 has a target date of Friday, May 30, you
may submit it Monday, June 2 with no penalty. (This is the last lab
assignment.)
(5/23) In Handout DD, p. 14, the explanation of rotations is
for using row vectors instead of column vectors as we are doing this
quarter. The formula using column vectors is given in Handout AA.
For these rotations, for now use the formula as given in Handout AA;
we'll get to the explanation in class soon.
(5/23) To see an example of the results of Lab 3, look at the
.ps file in the handout.
(5/23) In Lab 3, the .cmd file has now been updated. (Thanks to
C.T. for pointing out the need for this.)
(5/14) In Handout Z with Assignment 7, the last row should
be from Handout Y, not Handout W. A corrected version has been posted.
(5/13) In Assignment #6, let's make W-10(b) "not to hand in".
(5/13) Errata: In Handout W, p. W 6, in the least-squares
setup in the middle, there are some missing exponents with
value 3, and the last c sub 3 should be d sub 3. Also, on
p. W 7 at the top, as mentioned in class, the first
equation should have just A^t P on the right.
(5/13) In Lab 2, the instructions say to call the file "proj3.mws",
but that's from a previous course offering. Please call it
"lab2.mws".
(5/9) Misprint in Handout W as given out today: At the top of
p. W-7, the equation should read A t A C = A t
P .
(3/31) See the
Errata for the text by Farin and Hansford.
The errata are wrong in one respect: On p. 10, the volume
of a tetrahedron is 1/6 the value of the determinant.
Also, Example 1.5 should have answer 2. Here the authors mean
signed volume; usually we'd take the absolute value.