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fix logic for flip, remove useless member variable ( panCache ) #258

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fix logic for flip, remove useless member variable ( panCache ) #258

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3094306
fix logic for flip, remove useless member variable ( panCache )
bionoone Oct 24, 2022
06476cb
simplify code by using vtk transform matrix
bionoone Oct 26, 2022
397cb86
fix half voxel shift ( DICOM )
bionoone Oct 26, 2022
cb8997d
revert half voxel. there is probably some bug in rendering pipeline
bionoone Oct 26, 2022
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31 changes: 18 additions & 13 deletions packages/core/src/RenderingEngine/StackViewport.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -140,7 +140,6 @@ class StackViewport extends Viewport implements IStackViewport {
private _imageData: vtkImageDataType;
private cameraPosOnRender: Point3;
private stackInvalidated = false; // if true -> new actor is forced to be created for the stack
private panCache: Point3;
private voiApplied = false;
private rotationCache = 0;
private _publishCalibratedEvent = false;
Expand Down Expand Up @@ -196,7 +195,6 @@ class StackViewport extends Viewport implements IStackViewport {
this.imageIds = [];
this.currentImageIdIndex = 0;
this.targetImageIdIndex = 0;
this.panCache = [0, 0, 0];
this.cameraPosOnRender = [0, 0, 0];
this.resetCamera();

Expand Down Expand Up @@ -1667,9 +1665,11 @@ class StackViewport extends Viewport implements IStackViewport {
// it in the space 3) restore the pan, zoom props.
const cameraProps = this.getCamera();

this.panCache[0] = this.cameraPosOnRender[0] - cameraProps.position[0];
this.panCache[1] = this.cameraPosOnRender[1] - cameraProps.position[1];
this.panCache[2] = this.cameraPosOnRender[2] - cameraProps.position[2];
const panCache: [number, number, number] = [
this.cameraPosOnRender[0] - cameraProps.position[0],
this.cameraPosOnRender[1] - cameraProps.position[1],
this.cameraPosOnRender[2] - cameraProps.position[2],
];

// store rotation cache since reset camera will reset it
const rotationCache = this.rotationCache;
Expand All @@ -1691,7 +1691,7 @@ class StackViewport extends Viewport implements IStackViewport {

// We shouldn't restore the focalPoint, position and parallelScale after reset
// if it is the first render or we have completely re-created the vtkImageData
this._restoreCameraProps(cameraProps, previousCameraProps);
this._restoreCameraProps(cameraProps, previousCameraProps, panCache);

// Restore rotation for the new slice of the image
this.rotationCache = 0;
Expand Down Expand Up @@ -1976,23 +1976,24 @@ class StackViewport extends Viewport implements IStackViewport {
*/
private _restoreCameraProps(
{ parallelScale: prevScale }: ICamera,
previousCamera: ICamera
previousCamera: ICamera,
panCache: [number, number, number]
): void {
const renderer = this.getRenderer();

// get the focalPoint and position after the reset
const { position, focalPoint } = this.getCamera();

const newPosition = <Point3>[
position[0] - this.panCache[0],
position[1] - this.panCache[1],
position[2] - this.panCache[2],
position[0] - panCache[0],
position[1] - panCache[1],
position[2] - panCache[2],
];

const newFocal = <Point3>[
focalPoint[0] - this.panCache[0],
focalPoint[1] - this.panCache[1],
focalPoint[2] - this.panCache[2],
focalPoint[0] - panCache[0],
focalPoint[1] - panCache[1],
focalPoint[2] - panCache[2],
];

// Restoring previous state x,y and scale, keeping the new z
Expand All @@ -2001,6 +2002,10 @@ class StackViewport extends Viewport implements IStackViewport {
position: newPosition,
focalPoint: newFocal,
});
this.flip({
flipHorizontal: previousCamera.flipHorizontal,
flipVertical: previousCamera.flipVertical,
});

const camera = this.getCamera();

Expand Down
25 changes: 4 additions & 21 deletions packages/core/src/RenderingEngine/Viewport.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -237,36 +237,19 @@ class Viewport implements IViewport {
// proper scaling (flipping), they should be transformed to the origin and
// then flipped. The following code does this transformation.

const origin = imageData.getOrigin();
const direction = imageData.getDirection();
const spacing = imageData.getSpacing();
const size = imageData.getDimensions();

const iVector = direction.slice(0, 3);
const jVector = direction.slice(3, 6);
const kVector = direction.slice(6, 9);

// finding the center of the image
const center = vec3.create();
vec3.scaleAndAdd(center, origin, iVector, (size[0] / 2.0) * spacing[0]);
vec3.scaleAndAdd(center, center, jVector, (size[1] / 2.0) * spacing[1]);
vec3.scaleAndAdd(center, center, kVector, (size[2] / 2.0) * spacing[2]);

let flipHTx, flipVTx;

const transformToOriginTx = vtkMatrixBuilder
.buildFromRadian()
.identity()
.translate(center[0], center[1], center[2])
.rotateFromDirections(jVector, [0, 1, 0])
.rotateFromDirections(iVector, [1, 0, 0]);
.multiply(imageData.getIndexToWorld())
.translate(size[0] / 2.0, size[1] / 2.0, 0);

const transformBackFromOriginTx = vtkMatrixBuilder
.buildFromRadian()
.identity()
.rotateFromDirections([1, 0, 0], iVector)
.rotateFromDirections([0, 1, 0], jVector)
.translate(-center[0], -center[1], -center[2]);
.translate(-size[0] / 2.0, -size[1] / 2.0, 0)
.multiply(imageData.getWorldToIndex());

if (flipH) {
this.flipHorizontal = flipHorizontal;
Expand Down