how to read file in .raw format?

Web
1

I find the vtkImageReader in c++,but not have same api in vtk.js.
when i use vtkXMLImageDataReader, parseAsArrayBuffer(bufferarray) throw a error,like this:

image
image1758×1081 29.9 KB

2

raw format is not a VTK XML format.

If you have the raw data directly can’t you just create the vtkImageData? Why would you need a reader for something that is supported natively in JavaScript?

3

Sorry, I’m just starting to learn vtk.js and can’t find an example of using vtkImageData. With vtkImageData, how to read raw data and transfer it to vtkVolumeMapper?

4 
const arrayBuffer = ...;
const arrayValues = new Uint16Array(arrayBuffer);

const imageData = vtkImageData.newInstance({
     extent: [0, 345, 0, 456, 0, 675],
     origin: [0, 0, 0],
     spacing: [1, 1, 1],
});

imageData.getPointData().setScalars(
    vtkDataArray.newInstance({ values: arrayValues, name: 'scalar' })
);
5

Hi,thank you for the example, now the image can be displayed, but there seems to be a problem, I think it should be that I have misconfigured the configuration items.I modified the extent configuration item, but the slice displayed is still wrong.

This is an example of the wrong display：

image
image2223×1189 118 KB

This is the correct display image：
image

my raw file width is 128; height is 256;depth is 128.
The data structure of the raw file is：
image

my code is：

image
image797×272 25.2 KB

I looked for the configuration items in the official documentation, but I couldn’t find any relevant instructions. Can you help me see how to configure it? thanks

6

extent: [0, res.width - 1, 0, res.height - 1, 0, res.depth - 1]

1 Like
7

Thank you very much, it can be displayed normally, the slice count starts from 0, so it needs -1 right?