從ThreeJS中的2D對象繪制三維幾何

Question

我非常喜歡Three.js，我一直在嘗試實現以下內容：

假設我有一個來自瀏覽器視口的特定形狀的x和y坐標數組。 我想在Three.JS中渲染這些形狀，以便可以在z方向上添加高度。

形狀本身實際上是一個“建築物”，我有其平面布局坐標的數組，我想通過在Z方向上添加一個高度來3D化它。

我應該使用幾何/材料/技術來實現這一目標？

Answer 1

使用ExtrudeGeometry ，您可以將2D元素（坐標）拉伸到Three.js中的3D對象。

此處的示例： http : //stemkoski.github.io/Three.js/Extrusion.html

這里的文檔： http ： //threejs.org/docs/#Reference/Extras.Geometries/ExtrudeGeometry

示例中的代碼：

var starPoints = [];

starPoints.push( new THREE.Vector2 (   0,  50 ) );
starPoints.push( new THREE.Vector2 (  10,  10 ) );
starPoints.push( new THREE.Vector2 (  40,  10 ) );
starPoints.push( new THREE.Vector2 (  20, -10 ) );
starPoints.push( new THREE.Vector2 (  30, -50 ) );
starPoints.push( new THREE.Vector2 (   0, -20 ) );
starPoints.push( new THREE.Vector2 ( -30, -50 ) );
starPoints.push( new THREE.Vector2 ( -20, -10 ) );
starPoints.push( new THREE.Vector2 ( -40,  10 ) );
starPoints.push( new THREE.Vector2 ( -10,  10 ) );

var starShape = new THREE.Shape( starPoints );

var extrusionSettings = {
    size: 30, height: 4, curveSegments: 3,
    bevelThickness: 1, bevelSize: 2, bevelEnabled: false,
    material: 0, extrudeMaterial: 1
};

var starGeometry = new THREE.ExtrudeGeometry( starShape, extrusionSettings );

var materialFront = new THREE.MeshBasicMaterial( { color: 0xffff00 } );
var materialSide = new THREE.MeshBasicMaterial( { color: 0xff8800 } );
var materialArray = [ materialFront, materialSide ];
var starMaterial = new THREE.MeshFaceMaterial(materialArray);

var star = new THREE.Mesh( starGeometry, starMaterial );
star.position.set(0,50,0);
scene.add(star);

// add a wireframe to model
var wireframeTexture = new THREE.MeshBasicMaterial( { color: 0x000000, wireframe: true, transparent: true } ); 
var star = new THREE.Mesh( starGeometry, wireframeTexture );
star.position.set(0,50,0);
scene.add(star);