[vtkusers] Question about synchronization bwtween 3D and 2D image

[Shade]

Dear Everyone,

My aim is to synchronize the 2D images accordint to the mouse
cursor position in 3D Render Window.

I have searching the mailing list and found some mails of the same
question, but I didn't find the exact answer.

Following is my method trying to get the silce number of the Transverse,
Coronal and Sagittal View, but it seems not correct, I don't know what's
wrong? Please help me, thank you.

void C4DView3D::OnMouseMove(UINT nFlags, CPoint point) 
{
	float fBounds[6];
	::ZeroMemory( fBounds, sizeof(fBounds) );
	this->GetVolumeMapper()->GetBounds(fBounds);

	float fX = point.x;
	float fY = point.y;
	// Convert the Y axis to make it from bottom to top
	this->m_pRenderer->LocalDisplayToDisplay( fX, fY );
	// Get the ZBuffer value of the mouse point
	// Is is the exact Z value of the Display Coordinate?
	float fZ = this->m_pRenderer->GetZ( fX, fY );

	float fpWorldPoint[4] = { 0.0, 0.0, 0.0, 1.0 };
	// Set the Display Point
	this->m_pRenderer->SetDisplayPoint( fX, fY, fZ );
	// Convert the Display Coordinate to World Coordiante
	this->m_pRenderer->DisplayToWorld();
	// Get World Coordinate of the mouse point
	this->m_pRenderer->GetWorldPoint(fpWorldPoint);
	fX = fpWorldPoint[0] / fpWorldPoint[3];
	fY = fpWorldPoint[1] / fpWorldPoint[3];
	fZ = fpWorldPoint[2] / fpWorldPoint[3];

	//Transverse
	int nSliceNumT = (int)( fBounds[3] - fBounds[2] - fY );

	//Coronal
	int nSliceNumC = (int)( fBounds[5] - fBounds[4] ) / 2  + fZ;

	//Sagittal
	int nSliceNumS = (int)( fBounds[1] - fBounds[0] - fX );

	vtkMFCRenderView::OnMouseMove(nFlags, point);
}

The result is as following:
	1. Before Rotate the X , Y value seems correct but the Z value is not correct
	2. After Rotate the X, Y, Z value all are not correct.

I also tried the vtkWorldPointPicker method, but the result is the same as above method.

Welcome any opinion and suggestion. Thank you in advance!

Best Regards,
***********************************************************
Liu Jiquan
College of Biomedical Engineering & Instrument Science
Zhejiang University
Hangzhou, Zhejiang, 310027
P.R.China
Tel: +86-571-7951792Ext.13
Fax: +86-571-7951792Ext.18
EMail:shade_cn at yahoo.com
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