Three. js source code comments (17th) objects/PointCloud. js, pointcloud

Three. js source code comments (17th) objects/PointCloud. js, pointcloud

Wuji (http://blog.csdn.net/omni360)

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Reprinted please keep this sentence: Wuji-this blog focuses on Agile development and mobile and IOT device research: data visualization, GOLANG, Html5, WEBGL, THREE. JS. Otherwise, the post from this blog will not be reprinted or reprinted. Thank you for your cooperation.

I also just started learning. Sorry for the errors in many places.

The following code is a comment on the objects/PointCloud. JS file in the THREE. js source code file.

More updates in: https://github.com/omni360/three.js.sourcecode

/*** @ Author alteredq/http://alteredqualia.com/* // PointCloud point cloud object, in the scene easily change a large number of point genie object size, location and other attributes. * //// <summary> PointCloud </summary> /// <param name = "geometry" type = "THREE. geometry "> point set in the point cloud object of the Geometry object </param> // <param name =" material "type =" THREE. pointCloudMaterial "> PointCloudMaterial object (point cloud material object) </param> // <returns type =" PointCloud "> return Mesh object </returns> THREE. pointCloud = function (geometry, material) {THREE. Object3D. call (this); // call the call method of the Object3D object and hand over the method originally belonging to Object3D to the current object PointCloud for use. this. geometry = geometry! = Undefined? Geometry: new THREE. Geometry (); // assign the geometry parameter to the geometry attribute of the mesh object. this. material = material! = Undefined? Material: new THREE. pointCloudMaterial ({color: Math. random () * 0 xffffff}); // assign the material parameter to the material attribute of the PointCloud object. If the material parameter is not passed, a random color material is created, assigned to the current PointCloud object this. sortparticipant = false; // set whether to sort particles ?? // TODO .}; /*************************************** * ************ the method attribute definition of the PointCloud object is as follows, inherited from Object3D ************************************* * ************/THREE. pointCloud. prototype = Object. create (THREE. object3D. prototype); // * // The raycast method is used to obtain the intersection of the current object and the ray (raycaster parameter. raycaster. intersectObject calls this method. It is mainly used for collision detection. // It is often used when you select an object in a scenario. It is used to determine whether the current mouse matches the object and select an object. /// NOTE: The intersects parameter in the raycast method is used to store the set of intersections. The format is as follows: // intersects. push ({// distance: distance, // point: intersectionPoint, // indices: [a, B, c], // face: null, /// faceIndex: null, // object: this //////}); /// * //// <summary> raycast </summary> /// <param name = "raycaster" type = "THREE. raycaster "> Ray object </param> // <param name =" intersects "type =" ObjectArray "> Set of vertex attributes </param> /// <returns type = "ObjectArray"> THREE. pointCloud. prototype. raycast = (function () {var inverseMatrix = new THREE. matrix4 (); // declare a 4x4 matrix to place the inverse matrix var ray = new THREE. ray (); // declare the global Ray object return function (raycaster, intersects) {var object = this; var geometry = object. geometry; var threshold = raycaster. params. pointCloud. threshold; inverseMatrix. getInverse (this. matrixWorld ); Ray. copy (raycaster. ray). applyMatrix4 (inverseMatrix); if (geometry. boundingBox! = Null) {if (ray. isIntersectionBox (geometry. boundingBox) === false) {return ;}} var localThreshold = threshold/(this. scale. x + this. scale. y + this. scale. z)/3); var position = new THREE. vector3 (); // check whether the rays collide with the point cloud elements. var testPoint = function (point, index) {var rayPointDistance = ray. distanceToPoint (point); if (rayPointDistance <localThreshold) {var intersectPoint = ray. closestPoin TToPoint (point); intersectPoint. applyMatrix4 (object. matrixWorld); var distance = raycaster. ray. origin. distanceTo (intersectPoint); intersects. push ({distance: distance, distanceToRay: rayPointDistance, point: intersectPoint. clone (), index: index, face: null, object: object}) ;};// if the geometry object is a BufferGeometry object if (geometry instanceof THREE. bufferGeometry) {var attributes = geometry. attributes; var po Sitions = attributes. position. array; // The elements of pointCloud objects in three data formats are detected. if (attributes. index! = Undefined) {var indices = attributes. index. array; var offsets = geometry. offsets; if (offsets. length = 0) {var offset = {start: 0, count: indices. length, index: 0}; offsets = [offset];} for (var oi = 0, ol = offsets. length; oi <ol; ++ oi) {var start = offsets [oi]. start; var count = offsets [oi]. count; var index = offsets [oi]. index; for (var I = start, il = start + count; I <il; I ++) {var a = index + indices [I]; position. set (positions [a * 3], positions [a * 3 + 1], positions [a * 3 + 2]); testPoint (position, );}}} else {var pointCount = positions. length/3; for (var I = 0; I <pointCount; I ++) {position. set (positions [3 * I], positions [3 * I + 1], positions [3 * I + 2]); testPoint (position, I );}}} else {var vertices = this. geometry. vertices; for (var I = 0; I <vertices. length; I ++) {testPoint (vertices [I], I );}}};}()); /* clone method // clone method to clone a PointCloud point cloud object. * //// <summary> clone </summary> /// <param name = "object" type = "PointCloud"> receives the cloned Object3D object </param> // /<returns type = "PointCloud"> returns the PointCloud object. </returns> THREE. pointCloud. prototype. clone = function (object) {if (object = undefined) object = new THREE. pointCloud (this. geometry, this. material); object. sortparticipant = this. sortparticipant; THREE. object3D. prototype. clone. call (this, object); // inherit the Object3D clone method return object; // return the cloned PointCloud object}; // Backwards compatibility is backward compatible, and the particle system replaces the point cloud object. usage and THREE. pointCloud objects are the same. THREE. particle System = function (geometry, material) {console. warn ('Three. particle System has been renamed to THREE. pointCloud. '); return new THREE. pointCloud (geometry, material );};

Wuji (http://blog.csdn.net/omni360)

This article follows the "signature-non-commercial use-consistency" creation public agreement

Reprinted please keep this sentence: Wuji-this blog focuses on Agile development and mobile and IOT device research: data visualization, GOLANG, Html5, WEBGL, THREE. JS. Otherwise, the post from this blog will not be reprinted or reprinted. Thank you for your cooperation.

The following code is a comment on the objects/PointCloud. JS file in the THREE. js source code file.

More updates in: https://github.com/omni360/three.js.sourcecode