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Learning vtkjs之ImplicitBoolean

news 2025/7/2 1:13:29

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

在这里插入图片描述

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

	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

 	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 themconst 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 propermCubes.setInputConnection(sample.getOutputPort());mapper.setInputConnection(mCubes.getOutputPort());renderer.resetCamera();renderWindow.render();