var obj = this.m_scenes.get_object_by_name(objName);
var materials = this.m_mat.get_materials_names(obj);
materials.forEach((matName: any) => {
     console.log(matName, this.m_mat.get_diffuse_intensity(obj, matName));
     this.m_mat.set_diffuse_intensity(obj, matName, 0.01);            
});