Learning vtkjs之ImplicitBoolean

隐式函数布尔操作

介绍

vtkImplicitBoolean 允许对隐式函数（如平面、球体、圆柱体和盒子）进行布尔组合。操作包括并集、交集和差集。可以指定多个隐式函数（所有函数都使用相同的操作进行组合）。

支持的操作：'UNION'（<=0），'INTERSECTION'（=1），'DIFFERENCE'（>=2）

效果

核心代码

主要是隐式函数添加，然后执行操作，可视化是需要借助vtkSampleFunction来采样的

javascript 复制代码

	const lCylCut = vtkImplicitBoolean.newInstance({
      operation: Operation.UNION,
      functions: [cyl, pLeft],
    });
    const rCylCut = vtkImplicitBoolean.newInstance({
      operation: Operation.INTERSECTION,
    });
    rCylCut.addFunction(lCylCut);
    rCylCut.addFunction(pRight);

完整逻辑

javascript 复制代码

 	const fullScreenRenderer = vtkFullScreenRenderWindow.newInstance({
      background: [0, 0, 0],
      rootContainer: vtkContainerRef.current,
    });
    const renderer = fullScreenRenderer.getRenderer();
    const renderWindow = fullScreenRenderer.getRenderWindow();

    const actor = vtkActor.newInstance();
    renderer.addActor(actor);

    const mapper = vtkMapper.newInstance();
    actor.setMapper(mapper);

    // Build pipeline. Boolean together some implicit functions and then sample, isosurface them
    const pLeft = vtkSphere.newInstance({
      center: [-6.0, 0, 0],
      radius: 0.8,
      
    });
    const pRight = vtkPlane.newInstance({
      normal: [1, 0, 0],
      origin: [5, 0, 0],
    });
    const cyl = vtkCylinder.newInstance({
      radius: 0.5,
      center: [0, 0, 0],
      axis: [1, 0, 0],
    });
    const lCylCut = vtkImplicitBoolean.newInstance({
      operation: Operation.UNION,
      functions: [cyl, pLeft],
    });
    const rCylCut = vtkImplicitBoolean.newInstance({
      operation: Operation.INTERSECTION,
    });
    rCylCut.addFunction(lCylCut);
    rCylCut.addFunction(pRight);

    const sample = vtkSampleFunction.newInstance({
      implicitFunction: rCylCut,
      sampleDimensions: [100, 100, 100],
      modelBounds: [-7.5, 7.5, -1, 1, -1, 1],
    });
    const mCubes = vtkImageMarchingCubes.newInstance({ contourValue: 0.0 });

    // Connect the pipeline proper
    mCubes.setInputConnection(sample.getOutputPort());
    mapper.setInputConnection(mCubes.getOutputPort());

    renderer.resetCamera();
    renderWindow.render();

全部代码都放到github上了
新坑_Learning vtkjs_git地址

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