gl-select

Helper module for point picking rendering passes

Install

npm install gl-select

API

var createSelectBuffer = require("gl-select")

Constructor

var select = createSelectBuffer(gl, shape)

Creates a select buffer with the given shape

Methods

select.begin(x, y, radius)

Begins a selection pass for finding the closest point in the buffer to x,y

• x and y are the coordinates of the query point starting from the top-left of the screen
• radius is the radius in pixels to search

select.end()

Finishes the selection pass.

Returns An object whose properties encode the result of the closest point to the query point within radius, or null if no points are found. The properties of this object are:

• coord A length 2 array representing the coordinates of the closest pixel
• id The 8 bit identifier of the closest point
• value a 3 component vector storing the value of the selection
• distance The distance of the closest point to the selection point

select.dispose()

Destroys the selection buffer and releases all associated resources

Properties

select.shape

Updates or retrieves the shape of the selection buffer.

Legal

(c) 2014 Mikola Lysenko. MIT License