[vtkusers] vtkPicker returned actor

[Lonni Besançon]

Hi David,

Thanks a lot for everything.
I will try that tomorrow morning. Getting kinda late here. I’ll keep you posted.

Thanks again.

Have a good evening(?)


Best 






> On 01 Mar 2016, at 00:19, David Gobbi [via VTK] <ml-node+s1045678n5736943h26 at n5.nabble.com> wrote:
> 
> Hi Lonni,
> 
> Regarding picker->PickTextureOn(), I looked through the code and the
> docs, and it only moves the results of GetPointIJK(), GetCellIJK(), and
> GetPCoords() into the vtkTexture input data space.  GetMapperPoint() still
> returns the coord in the vtkPolyDataMapper input space.
> 
> So to get the data coords in the texture's data space, you'd have to do
> something like this pseudocode:
> 
> ix, iy, iz = picker->GetCellIJK()
> px, py, pz = picker->GetPCoords()
> x = origin[0] + (ix + px - 0.5)*spacing[0]
> y = origin[1] + (iy + py - 0.5)*spacing[1]
> z = origin[2] + (iz + pz - 0.5)*spacing[2] 
> 
> The above should give accurate data coords within the image space of
> the vtkTexture's input.
> 
> 
> Moving on to your latest email:
> 
> If you are getting the position with picker->GetMapperPosition(), and if I
> understand your pipeline properly, then the only matrix you need to apply
> to that position is the ResliceAxes matrix.  If that's not working, then maybe
> I still don't completely understand your pipeline (but I'm getting exhausted).
> 
> If you were getting the position in world coordinates, with GetPickPosition(),
> then you would have to apply the inverse of the actor matrix to move from
> world coordinates to data coordinates.  But rather than use GetPickPosition(),
> I believe it is better to instead get the data coords as I outlined above.
> 
>  - David
> 
> 
> 
> 
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