Velocity V and HPB Q [SOLVED]

[Helper]

On 08/08/2014 at 05:24, xxxxxxxx wrote:

I have a particles velocity vector

I want to change that to a new velocity vector  - by changing the Pitch Angle

From the Velocity Vector  I can get the HPB

I can then change the HPB angles

Q: How do get the new velocity vector, given the updated HPB.

tia

[Helper]

On 12/08/2014 at 08:44, xxxxxxxx wrote:

I've got a little further with this, but the more I read the more I think I'll need quaternions.

And it doesn't appear that they are supported in C4Ds Python SDK.

Any chance of that happening for R16?

[Helper]

On 13/08/2014 at 05:49, xxxxxxxx wrote:

Anybody there?

[Helper]

On 19/11/2014 at 06:44, xxxxxxxx wrote:

All I can tell you is I've been looking for them too and it seems they are not in the Python API...

[Helper]

On 20/11/2014 at 03:36, xxxxxxxx wrote:

I think you might need to get into Matrix transformations for that..

[Helper]

On 20/11/2014 at 08:53, xxxxxxxx wrote:

Hello,

you can create a vector by creating a Matrix from your HPB values and applying this Matrix to a default vector:

  
  # create Matrix  
  m = c4d.utils.HPBToMatrix(hpb)  
    
  # default vector  
  vec = c4d.Vector(0,0,1)  
    
  # apply  
  vec = m * vec  

best wishes,
Sebastian