Question

我通过合并圆形和平面几何形状来制作圆角平面。

具有平面颜色的渲染版本效果很好，但纹理会被切断。

我怀疑我必须以某种方式添加一些暗示或定义如何渲染纹理，但我不知道如何。

scene = new THREE.Scene();
camera = new THREE.PerspectiveCamera( 90, 1, 0.1, 1000 );

WIDTH = HEIGHT = 500

renderer = new THREE.WebGLRenderer({ antialias: true });
renderer.setClearColor( 0xffffff );
renderer.setSize(WIDTH, HEIGHT);

light = new THREE.PointLight(0xffffff);
light.position.set(0,0,100);
scene.add(light);

# 628 × 697


camera.position.z = 5;

document.body.appendChild(renderer.domElement);


meshA = new THREE.Mesh()


makeRoundedCornerPlane = (offset=2, radius=2, smooth=16) ->

    geometry = new THREE.Geometry()

    offset = (offset - radius) / 2
    radius = radius / 4
    smooth = 16

    cornerA = new THREE.CircleGeometry(radius, smooth, (Math.PI * 2 / 4) * 1, Math.PI * 2 / 4);
    matrixA = new THREE.Matrix4();
    matrixA.makeTranslation(0-offset, 0+offset, 0)
    geometry.merge(cornerA, matrixA)

    cornerB = new THREE.CircleGeometry(radius, smooth, (Math.PI * 2 / 4) * 0, Math.PI * 2 / 4);
    matrixB = new THREE.Matrix4();
    matrixB.makeTranslation(0+offset, 0+offset, 0)
    geometry.merge(cornerB, matrixB)

    cornerC = new THREE.CircleGeometry(radius, smooth, (Math.PI * 2 / 4) * 3, Math.PI * 2 / 4);
    matrixC = new THREE.Matrix4();
    matrixC.makeTranslation(0+offset, 0-offset, 0)
    geometry.merge(cornerC, matrixC)

    cornerD = new THREE.CircleGeometry(radius, smooth, (Math.PI * 2 / 4) * 2, Math.PI * 2 / 4);
    matrixD = new THREE.Matrix4();
    matrixD.makeTranslation(0-offset, 0-offset, 0)
    geometry.merge(cornerD, matrixD)

    planeA = new THREE.PlaneGeometry((offset+radius) * 2, offset * 2)
    geometry.merge(planeA)

    planeB = new THREE.PlaneGeometry(offset * 2, (offset+radius) * 2)
    geometry.merge(planeB)

    return geometry

meshA.geometry = makeRoundedCornerPlane(2, 0.5)

meshA.material = new THREE.MeshBasicMaterial
    side:THREE.DoubleSide
    color: new THREE.Color("rgb(255,0,0)")
    #wireframe: true

meshB = new THREE.Mesh()
meshB.geometry = makeRoundedCornerPlane(2, 0.5)

meshB.material = new THREE.MeshBasicMaterial
    side:THREE.DoubleSide
    color: new THREE.Color("rgb(255,0,0)")
    #wireframe: true

texture = new THREE.ImageUtils.loadTexture("/img/initializing.png");
texture.wrapS = texture.wrapT = THREE.RepeatWrapping;
meshB.material.map = texture
meshB.material.color = new THREE.Color(0xffffff)

meshB.position.x = -1
meshB.position.y = -1

scene.add(meshA)
scene.add(meshB)

update = ->
    # meshA.scale.x += 0.001
    # meshA.scale.y += 0.001
    meshA.rotation.z += 0.002
    meshA.rotation.y += 0.002
    meshB.rotation.z += 0.002
    meshB.rotation.y += 0.002

render = ->
    renderer.render(scene, camera)

tick = ->
    window.requestAnimationFrame(tick)
    update()
    render()

tick()

Answer 1

您需要修复网格中每个面的UV坐标。 UV坐标是告诉GL如何将图像映射到脸部的方法。左上角应该有UV坐标（0,0），右下角应该有（1,1）。

一种解决方案是迭代每个面并根据它在空间中的位置为其提供标准化的UV坐标，这可能适用于像您这样的简单示例。您基本上计算形状的边界框以标准化顶点坐标，然后为每个面创建3个UV坐标（因为每个面都是三角形）。

试试这个：http://jsfiddle.net/MacroMeez/e84y9bbq/1/

remapUVs = (geo) ->
geo.computeBoundingBox()
min = geo.boundingBox.min
max = geo.boundingBox.max
offset = new THREE.Vector2(0 - min.x, 0 - min.y)
size = new THREE.Vector2(max.x - min.x, max.y - min.y)
# Remove the old UVs that were incorrect
geo.faceVertexUvs[0] = []
for face, i in geo.faces
    v1 = geo.vertices[face.a]
    v2 = geo.vertices[face.b]
    v3 = geo.vertices[face.c]
    # Push on a new UV based on its position inside the shape
    geo.faceVertexUvs[0].push [
        new THREE.Vector2((v1.x + offset.x)/size.x, (v1.y + offset.y)/size.y),
        new THREE.Vector2((v2.x + offset.x)/size.x, (v2.y + offset.y)/size.y),
        new THREE.Vector2((v3.x + offset.x)/size.x, (v3.y + offset.y)/size.y)
    ]
geo.uvsNeedUpdate = true

基于找到的代码THREE.js generate UV coordinate

如果您对熟练机或其他3D软件一直熟悉，您还可以在那里创建并映射网格，然后导入它，而不是处理它。

如何在three.js中修复圆角平面上的纹理

1 个答案: