Simply Maya User Community - View Single Post - Im slightly stuck with Vectors

A =(1 -2 3) (3 1 5) (0 1 -3) B = ( 1 -8) (-9 8 )(2 4 )
Find A x B

Originally Posted by silverspawn

find the cross product of those two matrices?
im not sure i understand your equation though. I thought cross product is done between vectors and the way you typed A and B doesn't make sense. are the stuff in () columns or rows?
a matrix is a 'grid' of numbers like

Code:

3 5 6
4 4 4
1 2 2

the cross product of two vectors gives you the vector that's perpendicular to the two vectors...

2 (a) write out the rotation matrix that rotates an 2D object counterclockwise by 45 degrees by the coordinate origin.

b) suppose the three vertices of a triangle are A(0,0), B(10,5) and C(5,8) .Where are the vertices after the triangle is rotated counterclockwise 45 degrees by the coordinate origin?

Originally Posted by silverspawn

2a is trivial, you can look on the internet for what the rotation matrix is. (wikipedia has such info)
once you've done that and told us what you've found then someone could give you an example on how to resolve 2b