Three.js-几何体

几何体

自定义几何体的原理

给不同的面设置不同的颜色/材质

https://jsfiddle.net/vptec390/2/

原理是给每个顶点设置一个颜色

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const geometry = new THREE.BoxGeometry( 0.2, 0.2, 0.2 ).toNonIndexed();
    
    // vertexColors must be true so vertex colors can be used in the shader
    
const material = new THREE.MeshBasicMaterial( { vertexColors: true } ); 
    
    // generate color data for each vertex
    
    const positionAttribute = geometry.getAttribute( 'position' );
    
    const colors = [];
    const color = new THREE.Color();
    
    for ( let i = 0; i < positionAttribute.count; i += 3 ) {
    
        color.set( Math.random() * 0xffffff );
        
        // define the same color for each vertex of a triangle
        
        colors.push( color.r, color.g, color.b );
        colors.push( color.r, color.g, color.b );
        colors.push( color.r, color.g, color.b );
    
    }
    
    // define the new attribute
    
    geometry.setAttribute( 'color', new THREE.Float32BufferAttribute( colors, 3 ) );

mesh = new THREE.Mesh( geometry, material );
scene.add( mesh );

Three.js的面信息(face)有两种存储方式：Indexed和NonIndexed