Graham Wakefield

I've just uploaded a set of quaternion helper objects for Max. You 

http://www.maxobjects.com/?v=libraries&id_library=111

Quaternion helper objects. Convert between quaternion, Euler, 

cartesian and axis/angle representations.

"Represent, store and transform a quaternion"

"The mul messsage, with a quaternion argument, rotates the stored 

quaternion by the argument. bang outputs the stored value. reset sets 

it to zero rotation. quat takes an optional int argument - how often 

quaternions are normalized. Reduce to improve object efficiency, but 

increase to avoid floating point error creeping into the angles. 

Convert an axis/angle rotation (e.g. the output of jit.gl.handle) to 

Convert Euler rotations (azimuth/elevation/tilt or heading/attitude/ 

Convert quaternion to axis/angle rotation (e.g. most jit.gl rotate 

Select a unit vector in the quaternion rotation

quat2car returns a unit vector representing a principal axis of the 

rotation, which can be useful to accumulate positions of moving 

objects for example. Argument 'x', 'y', 'z, '-x', '-y' or '-z' 

Convert quaternion to Euler angles (azimuth/elevation/tilt or heading/ 

attitude/bank or yaw/pitch/roll). NOTE: there is a loss of 

information in the conversion from quaternion to Euler angles. This 

behaviour is matched by the original Shoemake algorithm.

I've just uploaded a set of quaternion helper objects for Max.  You  
can find more info here:

Quaternion helper objects. Convert between quaternion, Euler,  
cartesian and axis/angle representations.

quat
"Represent, store and transform a quaternion"
"The mul messsage, with a quaternion argument, rotates the stored  
quaternion by the argument. bang outputs the stored value. reset sets  
it to zero rotation. quat takes an optional int argument - how often  
quaternions are normalized. Reduce to improve object efficiency, but  
increase to avoid floating point error creeping into the angles.  
Default every 30 operations."

axis2quat
Convert an axis/angle rotation (e.g. the output of jit.gl.handle) to  
quaternion

euler2quat
Convert Euler rotations (azimuth/elevation/tilt or heading/attitude/ 
bank or yaw/pitch/roll) to quaternion

quat2axis
Convert quaternion to axis/angle rotation (e.g. most jit.gl rotate  
arguments)

quat2car
Select a unit vector in the quaternion rotation
quat2car returns a unit vector representing a principal axis of the  
rotation, which can be useful to accumulate positions of moving  
objects for example. Argument 'x', 'y', 'z, '-x', '-y' or '-z'  
specifies which axis is the 'front'

quat2euler
Convert quaternion to Euler angles (azimuth/elevation/tilt or heading/ 
attitude/bank or yaw/pitch/roll). NOTE: there is a loss of  
information in the conversion from quaternion to Euler angles. This  
behaviour is matched by the original Shoemake algorithm.

quatpov
Rotate a cartesian point by a quaternion


ANN: Quaternion objects for max