Rotation questions connected to Euler Angles

[XB H]

Hi there,

I am trying to use the Euler Angles's data generated by Dream3D. So I need to figure out the rotation of Euler Angles in Dream3D.

The first question is about the rotation axis sequence.

What is the rotation axis sequence of Euler Angles in Dream3D？ Maybe ZXZ?

The second question is about the rotation axis fixed or not. 

When we build a coordinate system in three dimentional space, we have three axis X, Y,

 Z. Then we rotate an object in the coordinate system. The rotation is represented by

 Euler Angles. Assume that the Euler Angles's rotation axis is ZXZ. When we rotate the

 first angle around the Z axis, and we will get a new X axis: X', and a new Y axis: Y'. So

 here comes a problem when I want to rotate the second angle. Which axis should I

 choose as the rotation axis when I rotate the second angle? The oringinal X axis or the

 new axis X' ?

Best Regard

Xiaobing Huang