XB PointStream
Releases
A cross-browser JavaScript tool which will emulate Arius3D's PointStream viewer. It will be able to quickly render a large amount of point cloud data to the <canvas> tag using WebGL.
XBPS 0.1
XBPS 0.2
XBPS 0.3
XBPS 0.4
XBPS 0.4.5 [Only Lib | Full]
XB PointStream Dev Links
Development Resources
Parser Interface
/*
Add an event listener to the parser. Once the event occurs, the parser
will call the associated function and pass in a reference to itself.
The parser needs to pass itself back to the library since the library could
be working with many parsers simultaneously.
@param {String} eventName - can be one of the following:
"onstart" - must occur exactly once - func(parser)
"onparse" - must occur one or many times - func(parser, {"VERTEX":[...], "COLOR":[...], etc...}
"onfinish" - must occur exactly once - func(parser)
"hook" - ?
@param {Function} func - the function to call when the event occurs.
*/
addEventListener(eventName, func)
/*
Begins to load the resource
@param {String} path - path to resource
*/
load(path)
/*
Get the version of this parser.
@returns {String} parser version
*/
getVersion()
/*
Get the number of points which have been parsed.
@returns {Number} the number of points parsed so far by the parser.
*/
getNumParsedPoints()
/*
Get the total number of points in the point cloud, including points
which have not yet been parsed.
@returns {Number} the total number of points in the resource or -1 if unknown.
*/
getNumTotalPoints()
/*
Get the progress of the parser, how much it has parsed so far.
@returns {Number} value from 0 to 1 or -1 if unknown.
*/
getProgress()
/*
The size of the resource in bytes.
@returns {Number} the number of bytes in the resource or -1 if unknown.
*/
getFileSize()
/* This example only demonstrates syntax. It hasn't been tested.
*/
function startCallback(parser){
alert( "Using parser version: " + parser.getVersion();
}
function parseCallback(parser){
parser.getProgress();
parser.getNumParsedPoints();
parser.getFileSize();
parser.getNumTotalPoints();
}
function finishCallback(){
}
var parser = new ASCParser();
parser.addEventListener("onstart", startCallback);
parser.addEventListener("onparse", parseCallback);
parser.addEventListener("onfinish", finishCallback);
parser.load(somePath);
Performance Issue Ideas
- Spatially partition point cloud into Bounding volume hierarchy and do bounding volume frustum culling
- Do static rendering
- Render low LOD when rotating point cloud
- Push as much as we can to CPU and GPU
- Use progressive "mesh" optimization to render objects if they are far from the camera
- Allow user to control LOD
- Stream point cloud, dynamically create and merge bounding volumes
- Pre-create Bounding volume hierarchy