Rotate Volume issue

Hi, I have a volume render, and I would like to rotate it in Desktop/VR, but I have issue in both of them, When I set myVolume.rotateX(interValue) volume is rotate but some of data is missing like this image:

the volume result in image after I rotateX 33 degree, I think this issue related to 858.

Any way, is rotate action a truth way to rotate volume? Since if I use camera view up nested of rotate, its work nice on desktop, but in VR not working truth since VR has left and right projection/view matrix and maybe I need to build a new matrix for that, Im not sure…

Additional Note: VTKJS Version: 11.1.0 Browser: Google Chrome 77.0 OS: Windows 10 64 bit.

Thanks for help.

[aneeshikmat]

Hi @jourdain

After trace rotate code, and take look at direction for input data, we can change the way for rotate data, we can build Orthogonal matrix from Rotation matrix and pass it to setDirection(), this way will make rotate work perfect with direction, I test it and implement it in my code, and all is good…

For example for my work (sample of code):

  publicAPI.customRotate = (degreeValue) => {
    var outPutMatrix = [[0,0,0],[0,0,0],[0,0,0]], outPutMatrixFinal = [[0,0,0],[0,0,0],[0,0,0]];
    var rotateX   = [[1, 0, 0], [0, Math.cos(degreeValue), -Math.sin(degreeValue)], [0, Math.sin(degreeValue), Math.cos(degreeValue)]];
    var rotateY   = [[Math.cos(degreeValue), 0, Math.sin(degreeValue)], [0, 1, 0], [-Math.sin(degreeValue), 0, Math.cos(degreeValue)]];
    var rotateZ   = [[Math.cos(degreeValue), -Math.sin(degreeValue), 0], [Math.sin(degreeValue), Math.cos(degreeValue), 0], [0, 0, 1]];
    vtkMath.multiplyMatrix(rotateX, rotateY, 3, 3, 3, 3, outPutMatrix);
    vtkMath.multiplyMatrix(outPutMatrix, rotateZ, 3, 3, 3, 3, outPutMatrixFinal);

    // return rotateX, or rotateY or rotateZ for single plan or outPutMatrixFinal for all plans;
  }

After I implement this way, Volume is rotate in Desktop/Vr without any issue, so that I share it, and no visual artifacts seen, I wish its be helpful too like your suggestions before.

Reference

[jourdain]

You can also adjust the VR camera as well. But since you want to rotate the volume at the representation level, that’s fine.

BTW, based on what I can understand from your explanations, the vtkImageData does exactly what you are looking for. But it is true, that you should also be able to define transform on Props so I’ll stop suggesting workarounds that will let you move forward.