On 20/05/2014 at 02:07, xxxxxxxx wrote:
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Hi guys.
What is the process of converting ZXY coordinates (from BVH file) to Cinema's HPB or ZYX coordinates?
I extracted rotation matrices from BVH's ZXY Euler angles like this:
Rx(X) = | 1 0 0 |
| 0 cosX +sinX |
| 0 -sinX cosX |
Ry(Y) = | cos Y 0 -sinY |
| 0 1 0 |
|+sinY 0 cosY |
Rz(Z) = | cosZ +sinZ 0 |
| -sinZ cosZ 0 |
| 0 0 1 |
Then did matrix multiplication R = YXZ as explained in http://research.cs.wisc.edu/graphics/Courses/cs-838-1999/Jeff/BVH.html at the bottom.
Now what is the process to get back those XYZ values from this new R matrix? Iam trying to replicate same values Cinema produces, but in AE.
I have a Euler angles in BVH like this: Zrotation Xrotation Yrotation with respective values: -3.41, 14.78, -164,35
Cinema, upon importing BVH, converts them to X = 104,805; Y = 3,297; and Z = -165,221;
So I am looking for a way to replicate these values. Any ideas on what formulas should I use?
Thank you.