bst-potree v1.6.0

Potree Core

• This project is based on Potree V1.6.
• Potree is a project created by Markus Schütz i have only adapted some of its components.
• Some elements were removed from the library - PotreeViewer - Controls, Input, GUI, Tools - Anotations, Actions, ProfileRequest - Potree.startQuery, Potree.endQuery and Potree.resolveQueries - Potree.timerQueries - Potree.MOUSE, Potree.CameraMode - PotreeRenderer, RepRenderer, Potree.Renderer - JQuery, TWEEN and Proj4 dependencies
• Point clouds are automatically updated, frustum culling is used to avoid unecessary updates.

How to use

• Download the custom potree build from the build folder
• Include it alonside the worker folder in your project
• Download threejs from github repository
  • https://github.com/mrdoob/three.js/tree/dev/build
• The build provided its not a module, its a bundle, it requires ES6 feature level support

Demo

• Live demo at https://tentone.github.io/potree-core/

  

Example

• Bellow its a fully functional example of how to use this wrapper to load potree point clouds to a THREE.js project

var scene = new THREE.Scene();
var camera = new THREE.PerspectiveCamera(60, 1, 0.1, 10000);

var canvas = document.createElement("canvas");
canvas.style.position = "absolute";
canvas.style.top = "0px";
canvas.style.left = "0px";
canvas.style.width = "100%";
canvas.style.height = "100%";
document.body.appendChild(canvas);

var renderer = new THREE.WebGLRenderer({canvas:canvas});

var geometry = new THREE.BoxGeometry(1, 1, 1);
var material = new THREE.MeshBasicMaterial({color: 0x00ff00});
var cube = new THREE.Mesh(geometry, material);
scene.add(cube);

var controls = new THREE.OrbitControls(camera, canvas);
camera.position.z = 10;

var points = new Potree.Group();
points.setPointBudget(10000000)
scene.add(points);

Potree.loadPointCloud("data/test/cloud.js", name, function(data)
{
	var pointcloud = data.pointcloud;
	points.add(pointcloud);
});

function loop()
{
	controls.update();
	renderer.render(scene, camera);
	requestAnimationFrame(loop);
};
loop();

document.body.onresize = function()
{
	var width = window.innerWidth;
	var height = window.innerHeight;
	renderer.setSize(width, height);
	camera.aspect = width / height;
	camera.updateProjectionMatrix();
}
document.body.onresize();

Reference

• The project has no generated documentation but bellow are some of the main configuration elements
• Potree.BasicGroup
  • Container that stores point cloud objects and updates them on render.
  • The container supports frustum culling using the point cloud bouding box.
  • Automatically stops updating the point cloud if out of view.
  • This container only support pointColorType set as RGB, pointSizeType set as FIXED and shape set as SQUARE.
• Potree.Group
  • Complete container with support for all potree features.
  • Some features require support for the following GL extensions
    • EXT_frag_depth, WEBGL_depth_texture, OES_vertex_array_object
• Potree.loadPointCloud
  • Method to load a point cloud database file
  • Potree.loadPointCloud(url, name, onLoad)
• Potree.PointCloudMaterial
  • Material used by threejs to draw the point clouds, based on RawShaderMaterial
  • shape
  • Defines the shape used to draw points
    • Possible values are
      • Potree.PointShape.SQUARE
      • Potree.PointShape.CIRCLE
      • Potree.PointShape.PARABOLOID
  • pointSizeType
    • Defines how the point cloud points are sized, fixed mode keeps the same size, adaptive resizes points accordingly to their distance to the camera
    • Possible values are
      • Potree.PointSizeType.FIXED
      • Potree.PointSizeType.ATTENUATED
      • Potree.PointSizeType.ADAPTIVE
  • pointColorType
    • Defines how to color the drawn points
    • Possible values are
      • Potree.PointColorType.RGB
      • Potree.PointColorType.COLOR
      • Potree.PointColorType.DEPTH
      • Potree.PointColorType.HEIGHT
      • Potree.PointColorType.INTENSITY
      • Potree.PointColorType.INTENSITY_GRADIENT
      • Potree.PointColorType.LOD
      • Potree.PointColorType.POINT_INDEX
      • Potree.PointColorType.CLASSIFICATION
      • Potree.PointColorType.RETURN_NUMBER
      • Potree.PointColorType.SOURCE
      • Potree.PointColorType.NORMAL
      • Potree.PointColorType.PHONG
      • Potree.PointColorType.RGB_HEIGHT
  • logarithmicDepthBuffer
    • Set true to enable logarithmic depth buffer
  • weighted
    • If true points are drawn as weighted splats
  • treeType
    • Defines the type of point cloud tree being drawn by this material
    • This should be automatically defined by the loader
      • Potree.TreeType.OCTREE
      • Potree.TreeType.KDTREE
• Potree.PointCloudTree
  • Base Object3D used to store and represent point cloud data.
  • These objects are created by the loader

Notes

• EDL shading is not supported by potree core

Building

• The output javascript is not a module of any kind
• Download and install java runtime.
• Download google clousure jar and place it on potree-core/closure.jar
• The project can be build using
  • npm install
  • npm run build

Create Point Clouds

• Use the Potree Converter tool to create point cloud data from LAS, ZLAS or BIN point cloud files

  • https://github.com/potree/PotreeConverter/releases

Dependencies

• three.js
• Closure compiler