通过 SetSampleDistance () 来设置每条射线的采样步长，默认值为1，单位为世界坐标系单位，数值越小越精细

通过 SetImageSampleDistance () 来设置图像采样距离，默认值为1，即投射光线的间隔数值越小越精细

核心代码如下

const cropFilter = vtkImageCropFilter.newInstance();

const reader = vtkHttpDataSetReader.newInstance({ fetchGzip: true });

const actor = vtkVolume.newInstance();
const mapper = vtkVolumeMapper.newInstance();
mapper.setSampleDistance(1);
actor.setMapper(mapper);

actor.getProperty().setUseGradientOpacity(0, true);//设置渐变色

cropFilter.setInputConnection(reader.getOutputPort());
mapper.setInputConnection(cropFilter.getOutputPort());

增加功能前

增加功能后