camera-picking-ray/index.js

creates a picking ray for a 2D/3D camera

var unproject = require('camera-unproject')
var set = require('gl-vec3/set')
var sub = require('gl-vec3/subtract')
var normalize = require('gl-vec3/normalize')

module.exports = createPickRay
function createPickRay(origin, direction, point, viewport, invProjView) {
  set(origin, point[0], point[1], 0)
  set(direction, point[0], point[1], 1)
  unproject(origin, origin, viewport, invProjView)
  unproject(direction, direction, viewport, invProjView)
  sub(direction, direction, origin)
  normalize(direction, direction)
}