How can I set the RGBA color for points in polyData

654545342 · August 2, 2022, 7:49am

How can I set the RGBA color for points in polyData
What is the range of RGBA values

Nicolas_Schmidt · August 2, 2022, 3:30pm

Take a look at the code here:

Kitware/vtk-js/blob/626483b671805873ba0af32f6884a09c39108e37/Sources/Rendering/Core/AxesActor/index.js#L26-L44


      
          function addColor(ds, r, g, b) {
            const size = ds.getPoints().getData().length;
            const rgbArray = new Uint8Array(size);
            let offset = 0;
          
          
  while (offset < size) {
              rgbArray[offset++] = r;
              rgbArray[offset++] = g;
              rgbArray[offset++] = b;
            }
          
          
  ds.getPointData().setScalars(
              vtkDataArray.newInstance({
                name: 'color',
                numberOfComponents: 3,
                values: rgbArray,
              })
            );
          }

The values are [0 - 255].