据我所知，没有自动的方法来计算紫外线。
您必须计算自己。计算平面的UV非常容易，此站点说明了如何：计算纹理坐标
对于复杂的形状，我不知道如何。也许您可以检测到平面。
编辑
这是平面的示例代码，
(x, y, z)其中
z = 0：
geometry.computeBoundingBox();var max = geometry.boundingBox.max, min = geometry.boundingBox.min;var offset = new THREE.Vector2(0 - min.x, 0 - min.y);var range = new THREE.Vector2(max.x - min.x, max.y - min.y);var faces = geometry.faces;geometry.faceVertexUvs[0] = [];for (var i = 0; i < faces.length ; i++) { var v1 = geometry.vertices[faces[i].a], v2 = geometry.vertices[faces[i].b], v3 = geometry.vertices[faces[i].c]; geometry.faceVertexUvs[0].push([ new THREE.Vector2((v1.x + offset.x)/range.x ,(v1.y + offset.y)/range.y), new THREE.Vector2((v2.x + offset.x)/range.x ,(v2.y + offset.y)/range.y), new THREE.Vector2((v3.x + offset.x)/range.x ,(v3.y + offset.y)/range.y) ]);}geometry.uvsNeedUpdate = true;
