Core Pure Flashcards
1
Q
Possible values for arg z
A
-π < arg z <= π
(can be π, cannot be -π)
2
Q
What does negative determinant mean?
A
Orientation is reversed (order of vertices reversed as well)
3
Q
Inverse of 2D matrix
A
1/detM * (swap the leading diagonal, negate the others)
4
Q
Significance of zero determinant for a 2D transformation
A
- all points on the plane are mapped to a straight line through the origin
- and each set of object points which are mapped to a single image point all lie on a straight line
5
Q
Significance of determinant for a 2D transformation
A
determinant represents the area scale factor