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@@ -153,7 +153,7 @@ var addMagnifier = function(){
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}
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*/
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-var convertTool = {
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+var convertTool = {
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getPos2d : function(point, camera, dom){//获取一个三维坐标对应屏幕中的二维坐标
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var camera = camera || player.camera;
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var dom = dom || player.domElement;
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@@ -308,7 +308,34 @@ var convertTool = {
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dir.multiplyScalar(Constants.skyRadius);
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dir.add(toPanoPos);
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return dir;
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- }
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+ } ,
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+ getScaleForConstantSize : function(op={}){ //获得规定二维大小的mesh的scale值。可以避免因camera的projection造成的mesh视觉大小改变。 来源：tag.updateDisc
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+ var w;
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+ var i = new THREE.Vector3, o = new THREE.Vector3, l = new THREE.Vector3, c = new THREE.Vector3, h = new THREE.Vector3
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+
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+ if(op.width2d) w = op.width2d //如果恒定二维宽度
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+ else{//否则考虑上距离，加一丢丢近大远小的效果
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+ var currentDis, nearBound, farBound
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+ if(op.camera.type == "OrthographicCamera"){
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+ currentDis = (op.camera.right - op.camera.left) / op.camera.zoom
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+ }else{
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+ currentDis = op.position.distanceTo(op.camera.position);
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+ }
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+ w = op.maxSize - ( op.maxSize - op.minSize) * THREE.Math.smoothstep(currentDis, op.nearBound, op.farBound);
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+ //maxSize ： mesh要表现的最大像素宽度； nearBound： 最近距离，若比nearBound近，则使用maxSize
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+ }
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+ i.copy(op.position).project(op.camera), //tag中心在屏幕上的二维坐标
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+ o.set(op.resolution.x / 2, op.resolution.y / 2, 1).multiply(i), //转化成px -w/2 到 w/2的范围
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+ l.set(w / 2, 0, 0).add(o), //加上tag宽度的一半
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+ c.set(2 / op.resolution.x, 2 / op.resolution.y, 1).multiply(l), //再转回 -1 到 1的范围
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+ h.copy(c).unproject(op.camera);//再转成三维坐标，求得tag边缘的位置
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+ var g = h.distanceTo(op.position)//就能得到tag的三维半径
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+
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+ return g //可能NAN 当相机和position重叠时
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+
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+ }
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+
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+
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}
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