Reply to post of user Evgeny Rodygin
Hi!
Of course, this can be done. But this functionality is not really related to Blend4Web itself. The example above also just uses a custom format to remember transformations of particular objects.

Say, you've placed a chair to a position with coordinates: X: 12.5, Y: 10, Z: 0.
When you press the "Save" button you need to get its position with corresponding API and write it to a text file which can be later used to restore the state.
It might look like this:
"Chair: Position: [12.5, 10, 0]"
You can use this information and assign this transformation to the Chair object with this method.

Reply to post of user Mike
you can use the check modules in the project manager and click the update modules button.

Uncaught Error: Module "__texcomp" not found(…)
b4w.js:198 Uncaught Error: Module "__navmesh" not found(…)

// 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_scn       = require("scenes");
var m_mat       = require("material");
var m_sfx       = require("sfx");
var m_objs       = require("objects");

Reply to post of user Evgeny Rodygin
Hi!
You can make a node structure like this one:


Having this, you can control the Value node through API in the following manner:

set_nodemat_value(obj, ["My_cool_material","Value" ], 0.1)