Date: Mon, 16 Dec 1996 23:39:36 GMT
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Last-modified: Mon, 08 Apr 1996 13:53:21 GMT
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Textbook Errors
Errata for Watt, "3D Computer Graphics"
Second Edition, Addison Wesley
The bulleted numbers refer to page number.
- 18
The first equation on the page has two mistakes. V^2 should read |V|^2.
Also VW should read V dot W.
- 60
The third row, second column entry of T_view should be sin(phi) not sin(theta).
- 62
The first 4x4 matrix is incorrect. It is not orthonormal
and thus cannot be the product of two rotations.
- 72
The second constraint in the middle of the page should read:
"Normalizing the range of zs values so that the range of
d<=zv<=f maps into the range 0<=zs<=1."
- 73
Matrix equation (3.1) has an incorrect last COLUMN. It should read
[0,0,1,0].
- 100
H=(L+V)/2 should read H=norm(L+V).
- 116
Equation (4.8) should have a set of brackets so that
the "1/2" multiplies the entire expression.
- 117
Figure 4.27 is confusing at best. I think that the N vector
should be H and the R vector should be V.
- 118
The third equation on the page gives mu as a function of Fo.
The mu should be eta, the index of refraction. The equation is just
a rearranged version of the one above it.
- 118
The second numbered bullet should read: "These values of eta ... "
- 120
Note that in the code the index of refraction is refered to as "mu".
- 130
In figure 5.4 the notation "Nt dot (P(t)-X)<0 implies S in inside" should read
"F is inside".
- 138
In Equation (5.2), the last "y2" in the equation for Nb
should be "ys". The "Ns" on the right of the equation for Ns should be "Na".
- 187
In Figure 6.21 the parametric directions u and v are reversed.