我有一个包含多个网格的场景,每个网格的形状和大小都不同。
我已经遍历每个网格并使用geometry.merge(),我已经能够根据场景中的几何形状创建一个新的网格。
我想用一个AlphaMask遮罩整个网格,但是,每个几何都有单独应用的材质。
可以在这里看到一个例子-https://codepen.io/danlong/pen/KXOObr
function addObjects(scene) {
// merged geomoetry & material
var mergedGeometry = new THREE.Geometry();
var mergedMaterial = new THREE.MeshStandardMaterial({ color: "#444", transparent: true, side: THREE.DoubleSide, alphaTest: 0.5, opacity: 1, roughness: 1 });
// multiple meshes
var geometry = new THREE.IcosahedronGeometry(30, 5);
var material = new THREE.MeshStandardMaterial({ color: "#444" });
var geo1 = new THREE.IcosahedronGeometry(30, 5);
var mesh1 = new THREE.Mesh( geo1, material );
mesh1.position.x = 10;
mesh1.position.y = 10;
mesh1.position.z = 0;
var geo2 = new THREE.IcosahedronGeometry(30, 5);
var mesh2 = new THREE.Mesh( geo2, material );
mesh2.position.x = 20;
mesh2.position.y = 20;
mesh2.position.z = 0;
var geo3 = new THREE.IcosahedronGeometry(30, 5);
var mesh3 = new THREE.Mesh( geo3, material );
mesh3.position.x = 30;
mesh3.position.y = 30;
mesh3.position.z = 0;
// scene.add(mesh1, mesh2, mesh3);
mesh1.updateMatrix();
mergedGeometry.merge(mesh1.geometry, mesh1.matrix);
mesh2.updateMatrix();
mergedGeometry.merge(mesh2.geometry, mesh2.matrix);
mesh3.updateMatrix();
mergedGeometry.merge(mesh3.geometry, mesh3.matrix);
// alpha texture
var image = document.createElement('img');
var alphaMap = new THREE.Texture(image);
image.onload = function() {
alphaMap.needsUpdate = true;
};
image.src = 'data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAgAAAAICAYAAADED76LAAAAGUlEQVQoU2NkYGD4z4AHMP7//x+/gmFhAgCXphP14bko/wAAAABJRU5ErkJggg==';
mergedMaterial.alphaMap = alphaMap;
mergedMaterial.alphaMap.magFilter = THREE.NearestFilter;
mergedMaterial.alphaMap.wrapT = THREE.RepeatWrapping;
mergedMaterial.alphaMap.repeat.y = 1;
// merged geometry with alpha mask
merge1 = new THREE.Mesh(mergedGeometry, mergedMaterial);
merge1.rotation.z = -Math.PI/4;
// merge geometry without alpha mask
var merge2 = new THREE.Mesh(mergedGeometry, material);
merge2.position.x = -100;
merge2.rotation.z = -Math.PI/4;
scene.add(merge1, merge2);
return mesh;
}
左侧的网格是我要对其应用alphaMask的合并几何。右边的网格是此操作的结果,而不是将贴图整体应用于网格,每个几何都应用了贴图。
有没有一种方法可以掩盖整个网格而不是每个几何?
-three.js r86
编辑:我试图将剪切平面应用于我的网格,但这并不是我想要的效果。我希望能够在整个网格上应用alphaMask并显示出来,但是我制作了蒙版图像。像这种效果-https://codepen.io/supah/pen/zwJxdb
这与从原始几何图形中保留紫外线有关吗?我需要以某种方式更改它们吗?
我认为您真正想要的是覆盖的面具。这可以通过在场景渲染之上渲染一个应用了Alpha贴图的平面来实现。使用正交摄影机并控制某些渲染器设置,例如禁用自动清除颜色。