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<div>Hi David,</div>
<div><br>
</div>
<div>I had been trying to do that where in I got the orientation from the vtkImageSlice (I wish it returned the orientation as a rotation matrix but I wrote the wiki convert Euler-Rotation matrix code) but now that you are speaking of the same solution, I think
I would look into what I was doing again and perhaps there was something slightly off. </div>
<div><br>
</div>
<div>Thank you for your advice! I would take every word of it! :)</div>
<div><br>
On Mar 28, 2013, at 8:47, "David Gobbi [via VTK]" <<a href="/user/SendEmail.jtp?type=node&node=5719696&i=0" target="_top" rel="nofollow" link="external">[hidden email]</a>> wrote:<br>
<br>
</div>
<blockquote style='border-left:2px solid #CCCCCC;padding:0 1em' type="cite">
<div>On Wed, Mar 27, 2013 at 6:41 PM, Debjit Ghosh <<a href="/user/SendEmail.jtp?type=node&node=5719693&i=0" target="_top" rel="nofollow" link="external">[hidden email]</a>> wrote:
<div class="shrinkable-quote"><br>
> I am not sure I explained myself right. <br>
> <br>
> I am currently slicing the volume by setting the camera's Position, Focal <br>
> Point and View Up. The normal of the plane is calculated by the sensor's <br>
> rotation matrix as follows: <br>
> <br>
> double *default_norm = {0,0,-1}; <br>
> double *normal; <br>
> <br>
> matrix->MultiplyPoint(this->default_norm, normal); <br>
> <br>
> //Calculate the focal point <br>
> double focalPt[3]; <br>
> double centerofvol[] = {dimX/2, dimY/2, dimZ/2}; <br>
> vtkSmartPointer<vtkPlane> plane = vtkSmartPointer<vtkPlane>::New(); <br>
> plane->SetOrigin(dimX/2, dimY/2, 0); <br>
> plane->SetNormal(normal); <br>
> plane->ProjectPoint( centerofvol, focalPt ); <br>
> <br>
> position[0] = focalPt[0] + distfromcam * this->normal[0]; <br>
> position[1] = focalPt[1] + distfromcam * this->normal[1]; <br>
> position[2] = focalPt[2] + distfromcam * this->normal[2]; <br>
> <br>
> cam->SetPosition(position); //Orientation of the slice plane <br>
> cam->SetFocalPoint(focalPt); //Point at which my plane is fixed <br>
> cam->SetViewUp(0,0,-1); <br>
> <br>
> This was working perfectly and I don't need to touch it at all except that, <br>
> the echocardiology demands that the volumes be rotated a certain way and <br>
> this I do using keyboard units sitting next to an echo expert. So let's say <br>
> at (30, 0, 180), the slices are now real as the echocardiogram would have <br>
> been and these values are going to be saved for future use. <br>
> <br>
> Until here the slicing works beautifully. But after I have set the slice's <br>
> orientation using RotateX, RotateY, RotateZ the problem starts where the <br>
> image is rotating around in the screen or is upside down or diagonal etc <br>
> based on the angles the slice has been rotated to. <br>
> <br>
> ---------------------------------- <br>
> <br>
> From what you said, and based on what I did, there isn't an anatomical <br>
> vector as such to to project to a plane. I would need to find out the view <br>
> up vector from the new orientation of the volume and then plug it into the <br>
> camera settings in place of leaving it as {0,0,-1}. <br>
> <br>
> How would I find the view up vector based on the new orientation of the <br>
> volume to say (30, 0, 150) or something...? </div>
<br>
If you already had a system where the view up vector was set correctly <br>
before the rotation was applied, then can't you just apply the rotation to <br>
vector you use as the view up vector? <br>
<br>
I always think of these visualization problems by considering what <br>
my degrees of freedom are, and what my constraints are. As long as <br>
I'm doing all my rotations with either matrices or quaternions, the math <br>
works out nicely because everything is linear. I almost never express <br>
orientations as a series of x,y,z rotations because it makes the math <br>
much more complicated... <br>
<br>
- David <br>
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