FIX:Maintain good perspective effect

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jira: none

Change-Id: I251a6189e8909f4c52752827e359a7287bd15f7f

src/libslic3r/Technologies.hpp

@@ -11,7 +11,7 @@
 // Renders a small sphere in the center of the bounding box of the current selection when no gizmo is active
 #define ENABLE_RENDER_SELECTION_CENTER 0
 // Shows an imgui dialog with camera related data
-#define ENABLE_CAMERA_STATISTICS 0
+//#define ENABLE_CAMERA_STATISTICS 0// by ctrl +shift +space quick key
 // Render the picking pass instead of the main scene (use [T] key to toggle between regular rendering and picking pass only rendering)
 #define ENABLE_RENDER_PICKING_PASS 0
 // Enable extracting thumbnails from selected gcode and save them as png files
@@ -22,7 +22,7 @@
 #define ENABLE_NONCUSTOM_DATA_VIEW_RENDERING 0
 // Enable G-Code viewer statistics imgui dialog
 #define ENABLE_GCODE_VIEWER_STATISTICS 0
-// Enable G-Code viewer comparison between toolpaths height and width detected from gcode and calculated at gcode generation 
+// Enable G-Code viewer comparison between toolpaths height and width detected from gcode and calculated at gcode generation
 #define ENABLE_GCODE_VIEWER_DATA_CHECKING 0
 // Enable project dirty state manager debug window
 #define ENABLE_PROJECT_DIRTY_STATE_DEBUG_WINDOW 0

src/slic3r/GUI/Camera.cpp

@@ -3,10 +3,9 @@
 
 #include "Camera.hpp"
 #include "GUI_App.hpp"
-#if ENABLE_CAMERA_STATISTICS
+
 #include "Mouse3DController.hpp"
 #include "Plater.hpp"
-#endif // ENABLE_CAMERA_STATISTICS
 
 #include <GL/glew.h>
 
@@ -380,7 +379,6 @@ void Camera::zoom_to_volumes(const GLVolumePtrs& volumes, double margin_factor)
     }
 }
 
-#if ENABLE_CAMERA_STATISTICS
 void Camera::debug_render()
 {
     ImGuiWrapper& imgui = *wxGetApp().imgui();
@@ -435,7 +433,6 @@ void Camera::debug_render()
     ImGui::InputFloat("GUI scale", &gui_scale, 0.0f, 0.0f, "%.6f", ImGuiInputTextFlags_ReadOnly);
     imgui.end();
 }
-#endif // ENABLE_CAMERA_STATISTICS
 
 void Camera::rotate_on_sphere_with_target(double delta_azimut_rad, double delta_zenit_rad, bool apply_limits, Vec3d target)
 {
@@ -524,7 +521,7 @@ std::pair<double, double> Camera::calc_tight_frustrum_zs_around(const BoundingBo
 {
     std::pair<double, double> ret;
     auto& [near_z, far_z] = ret;
-
+    m_scene_box_radius    = box.radius();
     // box in eye space
     const BoundingBoxf3 eye_box = box.transformed(m_view_matrix);
     near_z = -eye_box.max(2);
@@ -544,8 +541,15 @@ std::pair<double, double> Camera::calc_tight_frustrum_zs_around(const BoundingBo
 
     if (near_z < FrustrumMinNearZ) {
         const double delta = FrustrumMinNearZ - near_z;
+        set_distance(m_distance + delta);
+        m_last_scene_box_radius = m_scene_box_radius;
         near_z += delta;
         far_z += delta;
+    } else {
+        if (abs(m_last_scene_box_radius - m_scene_box_radius) > 1) {
+            m_last_scene_box_radius = m_scene_box_radius;
+            set_distance(DefaultDistance);
+        }
     }
 
     return ret;
@@ -608,6 +612,16 @@ double Camera::calc_zoom_to_bounding_box_factor(const BoundingBoxf3& box, double
     return std::min((double)m_viewport[2] / dx, (double)m_viewport[3] / dy);
 }
 
+void Camera::set_distance(double distance)
+{
+    if (m_distance != distance) {
+        m_view_matrix.translate((distance - m_distance) * get_dir_forward());
+        m_distance = distance;
+
+        update_target();
+    }
+}
+
 double Camera::calc_zoom_to_volumes_factor(const GLVolumePtrs& volumes, Vec3d& center, double margin_factor) const
 {
     if (volumes.empty())

src/slic3r/GUI/Camera.hpp

@@ -56,6 +56,8 @@ private:
     std::pair<double, double> m_frustrum_zs;
 
     BoundingBoxf3 m_scene_box;
+    float         m_scene_box_radius{0};
+    float         m_last_scene_box_radius{0};
     Frustum       m_frustum;
     Vec3f         m_last_eye, m_last_center, m_last_up;
     float         m_last_near, m_last_far, m_last_aspect, m_last_fov,m_last_zoom;
@@ -122,9 +124,7 @@ public:
     void zoom_to_box(const BoundingBoxf3& box, double margin_factor = DefaultZoomToBoxMarginFactor);
     void zoom_to_volumes(const GLVolumePtrs& volumes, double margin_factor = DefaultZoomToVolumesMarginFactor);
     void debug_frustum();
-#if ENABLE_CAMERA_STATISTICS
     void debug_render();
-#endif // ENABLE_CAMERA_STATISTICS
 
     // translate the camera in world space
     void translate_world(const Vec3d& displacement) { set_target(m_target + displacement); }
@@ -164,6 +164,7 @@ private:
     std::pair<double, double> calc_tight_frustrum_zs_around(const BoundingBoxf3& box);
     double calc_zoom_to_bounding_box_factor(const BoundingBoxf3& box, double margin_factor = DefaultZoomToBoxMarginFactor) const;
     double calc_zoom_to_volumes_factor(const GLVolumePtrs& volumes, Vec3d& center, double margin_factor = DefaultZoomToVolumesMarginFactor) const;
+    void   set_distance(double distance);
 
     void set_default_orientation();
     void set_iso_orientation();

src/slic3r/GUI/GLCanvas3D.cpp

@@ -2037,9 +2037,10 @@ void GLCanvas3D::render(bool only_init)
         wxGetApp().plater()->render_project_state_debug_window();
 #endif // ENABLE_PROJECT_DIRTY_STATE_DEBUG_WINDOW
 
-#if ENABLE_CAMERA_STATISTICS
+    if (wxGetApp().plater()->is_render_statistic_dialog_visible()) {
-    camera.debug_render();
+        camera.debug_render();
-#endif // ENABLE_CAMERA_STATISTICS
+        camera.debug_frustum();
+    }
 
 #if ENABLE_IMGUI_STYLE_EDITOR
     if (wxGetApp().get_mode() == ConfigOptionMode::comDevelop)