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### #4lucky6969b

Posted 23 February 2013 - 10:18 PM

I have found the formula for converting from a set of euler angles to matrix which says

[cos(h)cos(b)+sin(h)sin(p)sin(b) -cos(h)sin(b)+sin(h)sin(p)cos(b) sin(h)cos(p)] [sin(b)cos(p) cos(b)cos(p) -sin(p) ] [-sin(h)cos(b)+cos(h)sin(p)sin(b) sin(b)sin(h)+cos(h)sin(p)cos(b) cos(h)cos(p) ]

And I was twisting my fingers all night last night.

And concluded that to convert from z-up to y-up, I must

rotate x by 180 degrees(pitch), y 90 degrees(head), z -90 degrees(bank)

But In the first term _11, I found that it was a 0 when it is supposed to be a 1 there.

did I make any assumptions wrong?

Thanks

Jack

### #3lucky6969b

Posted 23 February 2013 - 10:17 PM

I have found the formula for converting from a set of euler angles to matrix which says

[cos(h)cos(b)+sin(h)sin(p)sin(b) -cos(h)sin(b)+sin(h)sin(p)cos(b) sin(h)cos(p)] [sin(b)cos(p) cos(b)cos(p) -sin(p) ] [-sin(h)cos(b)+cos(h)sin(p)sin(b) sin(b)sin(h)+cos(h)sin(p)cos(b) cos(h)cos(p) ]

And I was twisting my fingers all night last night.

And concluded that to convert from z-up to y-up, I must

rotate x by 180 degrees(pitch), y 90 degrees(head), z -90 degrees(bank)

But In the first term _11, I found that it was 0 when it is supposed to be a 1 there.

did I make any assumptions wrong?

Thanks

Jack

### #2lucky6969b

Posted 23 February 2013 - 09:59 PM

I have found the formula for converting from a set of euler angles to matrix which says

[cos(h)cos(b)+sin(h)sin(p)sin(b) -cos(h)sin(b)+sin(h)sin(p)cos(b) sin(h)cos(p)] [sin(b)cos(p) cos(b)cos(p) -sin(p) ] [-sin(h)cos(b)+cos(h)sin(p)sin(b) sin(b)sin(h)+cos(h)sin(p)cos(b) cos(h)cos(p) ]

And I was twisting my fingers all night last night.

And concluded that to convert from z-up to y-up, I must

rotate

y by +ve 90 degrees and z by -ve 90 degrees.

But In the first term _11, I found that it was 0 when it is supposed to be a 1 there.

did I make any assumptions wrong?

Thanks

Jack

### #1lucky6969b

Posted 23 February 2013 - 09:58 PM

I have found the formula for converting from a set of euler angles to matrix which says

And I was twisting my fingers all night last night.

And concluded that to convert from z-up to y-up, I must

rotate

y by +ve 90 degrees and z by -ve 90 degrees.

But In the first term _11, I found that it was 0 when it is supposed to be a 1 there.

did I make any assumptions wrong?

Thanks

Jack