[vtkusers] Transform a clipping plane

[WangQ]

Dear Cory,
I try to use 2 perpendicular planes to clip a volume to achieve something shown in the attachment, i.e. clipping 1/4 of a volume. But the result unfortunately  is reverse, i.e. clipping 3/4 away, and showing the rest 1/4. Do you have any suggestion?
Many thanks!
Chiang
Date: Tue, 5 Jan 2016 10:28:33 -0500
Subject: Re: [vtkusers] Transform a clipping plane
From: cory.quammen at kitware.com
To: wangq1979 at outlook.com
CC: vtkusers at vtk.org

Chiang,
The transform is applied to points at which the plane function is evaluated, but it is not considered when setting up clipping planes in the mapper.
You should be able to get the same effect from your rotations by applying the transform to a point representing the tip of the plane normal.
double normal[] = {0, 1, 0};double rotatedNormal[3];transPlane->TransformPoint(normal, rotatedNormal);plane->SetNormal(rotatedNormal);
HTH,Cory

On Tue, Jan 5, 2016 at 7:32 AM, WangQ <wangq1979 at outlook.com> wrote:



Hello vtkusers,
I used vtkplane to clip a volume. Everything is find until the volume is transformed. The plane is still at the original position. I then applied vtkTransform to the plane, but the plane is still the same place. The code snippet is as below:
    vtkSmartPointer<vtkPlane> plane =        vtkSmartPointer<vtkPlane>::New();    plane->SetOrigin(0, tomo2DDims / 2, 0);    plane->SetNormal(0, 1, 0);    vtkSmartPointer<vtkTransform> transPlane = vtkSmartPointer<vtkTransform>::New();    transPlane->RotateY(90);    transPlane->RotateZ(90);    transPlane->RotateX(55);    transPlane->RotateY(3);    plane->SetTransform(transPlane);
    cutVolumeMapper->AddClippingPlane(plane);

Appreciate your help in advance!
cheers,
Chiang 		 	   		  

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Cory Quammen
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