我需要创建一个带有渐变材质的圆形网格物体,它看起来就像它的阴影一样,所以:中心是黑色,边缘是白色。
目前我可以创建一个圆圈并将其移动到应该是的位置:
var floorGeometry = new THREE.CircleGeometry((Math.max(loadedObjectRotatedLength.x, loadedObjectRotatedLength.y)/2) + 15, 32);
var floorMaterial = new THREE.MeshBasicMaterial({color: 0xf0f0f0});
var floor = new THREE.Mesh(floorGeometry, floorMaterial);
floor.position = new THREE.Vector3((loadedObjectBoundingBox.min.x + loadedObjectBoundingBox.max.x)/2, (loadedObjectBoundingBox.min.y + loadedObjectBoundingBox.max.y)/2, loadedObjectBoundingBox.min.z);
任何人都可以帮助创建像Radial Gradient这样的材质? :/
答案 0 :(得分:0)
有几种方法可以做到。
1)加载渐变图像并将其应用于材质,如@GuyGood评论中所述
代码将是这样的:
var circleGeometry = new THREE.CircleGeometry(200, 200, 32);
var texture = THREE.ImageUtils.loadTexture('image/shadow.png');// replace with appropriate URL
texture.anisotropy = renderer.getMaxAnisotropy();
var material = new THREE.MeshBasicMaterial({
map: texture,
color:0xFFFFFF
});
mesh = new THREE.Mesh(circleGeometry, material);
scene.add(mesh);
2)我在这里特别提到的另一种方法是,我们可以创建一个canvas
元素并在其上绘制任何内容(在您的情况下,它是一个带有渐变的圆圈,但它可以是任何东西),并创建它的纹理并应用于材料。
代码将是这样的
var circleGeometry = new THREE.CircleGeometry(100, 100, 100);
// create a texture on canvas and apply it on material
var canvas = document.createElement('canvas');
var ctx = canvas.getContext('2d');
var x = 150,
y = 75,
// Radii of the black glow.
innerRadius = 0,
outerRadius = 200,
// Radius of the entire circle.
radius = 200;
var gradient = ctx.createRadialGradient(x, y, innerRadius, x, y, outerRadius);
gradient.addColorStop(0, 'black');
gradient.addColorStop(1, 'white');
ctx.arc(x, y, radius, 0, 2 * Math.PI);
ctx.fillStyle = gradient;
ctx.fill();
var shadowTexture = new THREE.Texture(canvas);
shadowTexture.needsUpdate = true;
var material = new THREE.MeshBasicMaterial({
map: shadowTexture,
side: THREE.DoubleSide
});
mesh = new THREE.Mesh(circleGeometry, material);
scene.add(mesh);