User posts Max_Cohen
28 July 2017 13:17
Thank you, Will.

This is my piece of code, where I want to try rotate with animate. But it not work as I wait.

var elapsed_sensor = m_ctl.create_elapsed_sensor();
var delta_rotate = new Float32Array(4);
var rotate = 3;
var obj_rot = new Float32Array(4);
var target_rot = new Float32Array(4);

m_trans.get_translation(obj, obj_pos);
m_trans.get_translation(target, target_pos);

m_trans.get_rotation(obj, obj_rot);
m_trans.get_rotation(target, target_rot);

var main_cb = function(obj, id) {
    var elapsed = m_ctl.get_sensor_value(obj, id, 0);

    m_trans.get_rotation(target, target_rot);
    m_vec4.subtract(obj_rot, target_rot, delta_rotate);
    m_vec4.normalize(delta_rotate, delta_rotate);
    m_vec4.scale(delta_rotate, elapsed * rotate, delta_rotate);
    m_vec4.add(obj_rot, delta_rotate, obj_rot);
    m_trans.set_rotation_v(obj, obj_rot);

m_ctl.create_sensor_manifold(obj, 'HANDLE', m_ctl.CT_CONTINUOUS, [elapsed_sensor], null, main_cb);

What I am do wrong?
28 July 2017 11:51
Thanks again for you reply.

Sorry to my English. I want to do this. When I click an object, then I must rotate item, when I clicked. You can understand this, if you load my "test_project". But I can't yet did rotate object. I just create two scenes. And interact it with JS.

Now, I want to do this. When object clicked, it must rotate to angle as "Target" object. But I do something wrong.

Zip file:
28 July 2017 10:25

Hi, Will. Thank you for your replies. I have a question about this function. May I use this function and select object, when click mouse button 1. I think, in my case I must use ray. But I can't found documentation.

Next question is: How to rotate an object to vector, where the camera is targeted. I mean where the camera saw.

27 July 2017 11:07
If you have a look at the Bone API, it does some rotating of objects. See the 'View Code' button in the lower left corner when you open this link.

Hi, Will. Thank you.
I am a newbie. Only one week, that I use this blend4web engine. The documentation is not full. And API doesn't have an search field.

I have been loaded my scene. Can you check it? I can't select an objects. My mouse cursor is hided.
24 July 2017 14:29
Hi, there!
How I must to do, with mouse rotate an object in itself object axis? What is of kind API method I must to use?

Update: This is what I did. How I can set up a camera angles after, change the camera type?

"use strict"

// register the application module
b4w.register("test_project_main", function(exports, require) {

// import modules used by the app
var m_app       = require("app");
var m_cfg       = require("config");
var m_data      = require("data");
var m_preloader = require("preloader");
var m_ver       = require("version");
var m_scenes = require('scenes');
var m_version = b4w.require('version');
var m_fps = require("fps");
var m_ctl = require('controls');
var m_cont =  require('container');
var m_cam = require('camera');
var m_mouse = require('mouse');
var m_trans = require('transform');
var m_phys = require('physics');
var m_obj = require('objects');
var m_const = require('constraints');
var m_quat = require('quat');

// detect application mode
var DEBUG = (m_ver.type() == "DEBUG");

// automatically detect assets path
var APP_ASSETS_PATH = m_cfg.get_assets_path("test_project");

var _vec2_tmp = new Float32Array(2);

 * export the method to initialize the app (called at the bottom of this file)
exports.init = function() {
        canvas_container_id: "main_canvas_container",
        callback: init_cb,
        show_fps: DEBUG,
        console_verbose: DEBUG,
        autoresize: true

 * callback executed when the app is initialized 
function init_cb(canvas_elem, success) {

    if (!success) {
        console.log("b4w init failure");


    // ignore right-click on the canvas element
    canvas_elem.oncontextmenu = function(e) {
        return false;


 * load the scene data
function load() {
    m_data.load(APP_ASSETS_PATH + "test_project.json", load_cb, preloader_cb);

 * update the app's preloader
function preloader_cb(percentage) {

 * callback executed when the scene data is loaded
function load_cb(data_id, success) {

    if (!success) {
        console.log("b4w load failure");


    var cont = m_cont.get_container();
    cont.addEventListener("mousedown", main_canvas_down, false);

function main_canvas_down(e) {
    if (e.preventDefault) {

    var x = m_mouse.get_coords_x(e);
    var y = m_mouse.get_coords_y(e);

    var obj = m_scenes.pick_object(x, y);

    if (obj) {
        var pos = m_trans.get_translation(obj);
        var cam = m_scenes.get_active_camera();

        switch ( {
            case 'Cube test':
                var pos = m_trans.get_translation(obj);

                m_cam.eye_setup(cam, {look_at: pos});
                    m_cam.eye_setup(cam, {look_at: pos});
                }, 1000);

            case 'Cube Click':
                m_cam.get_camera_angles(cam, _vec2_tmp);

                var pos = m_trans.get_translation(obj);
                m_cam.target_setup(cam, {pivot: pos, dist_lim: {min: 1, max: 10}});