В основном, что я хочу создать:
У меня есть 3D-карта с объектами, я хочу выбрать все объекты, которые находятся в 2D-поле от x1, y1 до x2, y2 на моем экране.
Любые идеи, как это должно быть сделано, потому что я не знаю, как начать.
Заранее спасибо!
prevX
и prevY
- это координата мыши вниз:
function onDocumentMouseUp(event) {
event.preventDefault();
var x = (event.clientX / window.innerWidth) * 2 - 1;
var y = -(event.clientY / window.innerHeight) * 2 + 1;
var width = (x - prevX); //* window.innerWidth;
var height = (y - prevY); //* window.innerHeight;
var dx = prevX; //* window.innerWidth;
var dy = prevY; //* window.innerHeight;
console.log(
dx + ',' +
dy + "," +
(dx + width) + "," +
(dy + height) +
", width=" + width +
", height=" + height
);
var topLeftCorner3D = new THREE.Vector3(dx, dy, 1).unproject(
camera);
var topRightCorner3D = new THREE.Vector3(dx + width, dy, 1)
.unproject(camera);
var bottomLeftCorner3D = new THREE.Vector3(dx, dy + height,
1).unproject(camera);
var bottomRightCorner3D = new THREE.Vector3(dx + width, dy +
height, 1).unproject(camera);
var topPlane = new THREE.Plane();
var rightPlane = new THREE.Plane();
var bottomPlane = new THREE.Plane();
var leftPlane = new THREE.Plane();
topPlane.setFromCoplanarPoints(camera.position,
topLeftCorner3D, topRightCorner3D);
rightPlane.setFromCoplanarPoints(camera.position,
topRightCorner3D, bottomRightCorner3D);
bottomPlane.setFromCoplanarPoints(camera.position,
bottomRightCorner3D, bottomLeftCorner3D);
leftPlane.setFromCoplanarPoints(camera.position,
bottomLeftCorner3D, topLeftCorner3D);
//var frustum = new THREE.Frustum( topPlane, bottomPlane, leftPlane, rightPlane, nearPlane, farPlane);
function isObjectInFrustum(object3D) {
var sphere = object3D.geometry.boundingSphere;
var center = sphere.center;
var negRadius = -sphere.radius;
if (topPlane.distanceToPoint(center) < negRadius) { return false; }
if (bottomPlane.distanceToPoint(center) < negRadius) { return false; }
if (rightPlane.distanceToPoint(center) < negRadius) { return false; }
if (leftPlane.distanceToPoint(center) < negRadius) { return false; }
return true;
}
var matches = [];
for (var i = 0; i < window.objects.length; i++) {
if (isObjectInFrustum(window.objects[i])) {
window.objects[i].material = window.selectedMaterial;
}
}
}