Per letter emboss with align

src/libslic3r/Emboss.cpp

@@ -1870,19 +1870,19 @@ std::vector<double> Emboss::calculate_angles(int32_t distance, const PolygonPoin
     return result;
 }
 
-PolygonPoints Emboss::sample_slice(const TextLine &slice, const BoundingBoxes &bbs, int32_t center_x, double scale)
+PolygonPoints Emboss::sample_slice(const TextLine &slice, const BoundingBoxes &bbs, double scale)
 {
     // find BB in center of line
     size_t first_right_index = 0;
     for (const BoundingBox &bb : bbs)
-        if (bb.min.x() > center_x) {
+        if (bb.min.x() > 0) {
             break;
         } else {
             ++first_right_index;
         }
 
     PolygonPoints samples(bbs.size());
-    int32_t shapes_x_cursor = center_x;
+    int32_t shapes_x_cursor = 0;
 
     PolygonPoint cursor = slice.start; //copy
 
@@ -1908,7 +1908,7 @@ PolygonPoints Emboss::sample_slice(const TextLine &slice, const BoundingBoxes &b
         samples[index] = create_sample(bbs[index], is_reverse);
 
     // calc transformation for letters on the Left side from center
-    shapes_x_cursor = center_x;
+    shapes_x_cursor = 0;
     cursor = slice.start; // copy    
     is_reverse = false;
     for (size_t index_plus_one = first_right_index; index_plus_one > 0; --index_plus_one) {

src/libslic3r/Emboss.hpp

@@ -427,10 +427,9 @@ namespace Emboss
     /// </summary>
     /// <param name="slice">Polygon and start point</param>
     /// <param name="bbs">Bounding boxes of letter on one line</param>
-    /// <param name="center_x">Center x coor of bbs line</param>
     /// <param name="scale">Scale for bbs</param>
     /// <returns>Sampled polygon by bounding boxes</returns>
-    PolygonPoints sample_slice(const TextLine &slice, const BoundingBoxes &bbs, int32_t center_x, double scale);
+    PolygonPoints sample_slice(const TextLine &slice, const BoundingBoxes &bbs, double scale);
 
     /// <summary>
     /// Calculate angle for polygon point

src/slic3r/GUI/Gizmos/GLGizmoEmboss.cpp

@@ -236,8 +236,9 @@ static bool draw_button(const IconManager::VIcons& icons, IconType type, bool di
 /// </summary>
 /// <param name="camera">Define view vector</param>
 /// <param name="canvas">Containe Selected Model to modify</param>
+/// <param name="keep_up">Keep same up vector</param>
 /// <returns>True when apply change otherwise false</returns>
-static bool apply_camera_dir(const Camera &camera, GLCanvas3D &canvas);
+static bool apply_camera_dir(const Camera &camera, GLCanvas3D &canvas, bool keep_up);
 
 } // namespace priv
 
@@ -3201,11 +3202,16 @@ void GLGizmoEmboss::draw_advanced()
         }
     }
 
+    if (exist_change) {
+        m_style_manager.clear_glyphs_cache();
+        process();
+    }
+
     if (ImGui::Button(_u8L("Set text to face camera").c_str())) {
         assert(get_selected_volume(m_parent.get_selection()) == m_volume);
-        const Camera &cam         = wxGetApp().plater()->get_camera();
-        bool          use_surface = m_style_manager.get_style().prop.use_surface;
-        if (priv::apply_camera_dir(cam, m_parent) && use_surface)
+        const Camera &cam  = wxGetApp().plater()->get_camera();
+        bool use_surface = m_style_manager.get_style().prop.use_surface;
+        if (priv::apply_camera_dir(cam, m_parent, m_keep_up) && use_surface)
             process();
     } else if (ImGui::IsItemHovered()) {
         ImGui::SetTooltip("%s", _u8L("Orient the text towards the camera.").c_str());
@@ -3218,7 +3224,7 @@ void GLGizmoEmboss::draw_advanced()
             if (!m_text_lines.is_init())
                 init_text_lines();
         }
-        exist_change = true;
+        process();
     } else if (ImGui::IsItemHovered()) {
         if (*per_glyph) {
             ImGui::SetTooltip("%s", _u8L("Set global orientation for whole text.").c_str());
@@ -3234,6 +3240,7 @@ void GLGizmoEmboss::draw_advanced()
     ImGui::SetNextItemWidth(100);
     if (ImGui::SliderFloat("##base_line_y_offset", &m_text_lines.offset, -10.f, 10.f, "%f mm")) {
         init_text_lines();
+        process();
     } else if (ImGui::IsItemHovered()) 
         ImGui::SetTooltip("%s", _u8L("Move base line (up/down) for allign letters").c_str());
 
@@ -3253,13 +3260,10 @@ void GLGizmoEmboss::draw_advanced()
     int selected_align = static_cast<int>(font_prop.align);
     if (ImGui::Combo("align", &selected_align, align_names, IM_ARRAYSIZE(align_names))) {
         font_prop.align = static_cast<FontProp::Align>(selected_align);
-    }
-
-    
-    if (exist_change) {
-        m_style_manager.clear_glyphs_cache();
+        // TODO: move with text in finalize to not change position
         process();
     }
+
 #ifdef ALLOW_DEBUG_MODE
     ImGui::Text("family = %s", (font_prop.family.has_value() ?
                                     font_prop.family->c_str() :
@@ -3743,8 +3747,7 @@ void priv::change_window_position(std::optional<ImVec2>& output_window_offset, b
         output_window_offset = ImVec2(-1, -1); // Cannot 
 }
 
-
-bool priv::apply_camera_dir(const Camera &camera, GLCanvas3D &canvas) {
+bool priv::apply_camera_dir(const Camera &camera, GLCanvas3D &canvas, bool keep_up) {
     const Vec3d &cam_dir = camera.get_dir_forward();
 
     Selection &sel = canvas.get_selection();

src/slic3r/GUI/Jobs/EmbossJob.cpp

@@ -457,11 +457,13 @@ template<typename Fnc> TriangleMesh create_mesh_per_glyph(DataBase &input, Fnc w
     if (shapes.empty())
         return {};
 
-    const FontFile &ff          = *font.font_file;
-    double          shape_scale = get_shape_scale(prop, ff);
+    align_shape(prop.align, shapes); 
 
-    BoundingBox extents; // whole text to find center
-    // separate lines of text to vector
+    const FontFile &ff = *font.font_file;
+    double shape_scale = get_shape_scale(prop, ff);
+
+    // Precalculate bounding boxes of glyphs
+    // Separate lines of text to vector of Bounds
     std::vector<BoundingBoxes> bbs(count_lines);
     size_t                     text_line_index = 0;
     // s_i .. shape index
@@ -470,7 +472,6 @@ template<typename Fnc> TriangleMesh create_mesh_per_glyph(DataBase &input, Fnc w
         BoundingBox       bb;
         if (!shape.empty()) {
             bb = get_extents(shape);
-            extents.merge(bb);
         }
         BoundingBoxes &line_bbs = bbs[text_line_index];
         line_bbs.push_back(bb);
@@ -487,14 +488,13 @@ template<typename Fnc> TriangleMesh create_mesh_per_glyph(DataBase &input, Fnc w
     double  em_2_mm      = prop.size_in_mm / 2.;
     int32_t em_2_polygon = static_cast<int32_t>(std::round(scale_(em_2_mm)));
 
-    Point  center     = extents.center();
     size_t s_i_offset = 0; // shape index offset(for next lines)
     indexed_triangle_set result;
     for (text_line_index = 0; text_line_index < input.text_lines.size(); ++text_line_index) {
         const BoundingBoxes &line_bbs = bbs[text_line_index];
         const TextLine      &line     = input.text_lines[text_line_index];
         // IMPROVE: do not precalculate samples do it inline - store result its
-        PolygonPoints        samples  = sample_slice(line, line_bbs, center.x(), shape_scale);
+        PolygonPoints        samples  = sample_slice(line, line_bbs, shape_scale);
         std::vector<double>  angles   = calculate_angles(em_2_polygon, samples, line.polygon);
 
         for (size_t i = 0; i < line_bbs.size(); ++i) {