ENH: rendering: refine the rendering logic of GLVolume

1. set the unprintable volume to black even if it is mmu painted
2. add the bounding check logic when the object is partly inside of current plate

Change-Id: I69ce25eb85a71398ed8fb1d275136c5d943796d6

resources/shaders/gouraud.fs

@@ -64,6 +64,23 @@ void main()
         alpha = 1.0;
     }
 	
+    // if the fragment is outside the print volume -> use darker color
+    vec3 pv_check_min = ZERO;
+    vec3 pv_check_max = ZERO;
+    if (print_volume.type == 0) {
+        // rectangle
+        pv_check_min = world_pos.xyz - vec3(print_volume.xy_data.x, print_volume.xy_data.y, print_volume.z_data.x);
+        pv_check_max = world_pos.xyz - vec3(print_volume.xy_data.z, print_volume.xy_data.w, print_volume.z_data.y);
+        color = (any(lessThan(pv_check_min, ZERO)) || any(greaterThan(pv_check_max, ZERO))) ? mix(color, ZERO, 0.3333) : color;
+    }
+    else if (print_volume.type == 1) {
+        // circle
+        float delta_radius = print_volume.xy_data.z - distance(world_pos.xy, print_volume.xy_data.xy);
+        pv_check_min = vec3(delta_radius, 0.0, world_pos.z - print_volume.z_data.x);
+        pv_check_max = vec3(0.0, 0.0, world_pos.z - print_volume.z_data.y);
+        color = (any(lessThan(pv_check_min, ZERO)) || any(greaterThan(pv_check_max, ZERO))) ? mix(color, ZERO, 0.3333) : color;
+    }
+
 	//BBS: add outline_color
 	if (is_outline)
 		gl_FragColor = uniform_color;

src/slic3r/GUI/3DScene.cpp

@@ -434,6 +434,7 @@ GLVolume::GLVolume(float r, float g, float b, float a)
     , zoom_to_volumes(true)
     , shader_outside_printer_detection_enabled(false)
     , is_outside(false)
+    , partly_inside(false)
     , hover(HS_None)
     , is_modifier(false)
     , is_wipe_tower(false)
@@ -679,7 +680,7 @@ void GLVolume::render(bool with_outline) const
         bool color_volume = false;
         ModelObjectPtrs& model_objects = GUI::wxGetApp().model().objects;
         do {
-            if (object_idx() >= model_objects.size())
+            if ((!printable) || object_idx() >= model_objects.size())
                 break;
 
             ModelObject* mo = model_objects[object_idx()];
@@ -907,7 +908,7 @@ void GLVolume::simple_render(GLShaderProgram* shader, ModelObjectPtrs& model_obj
     ModelObject* model_object = nullptr;
     ModelVolume* model_volume = nullptr;
     do {
-        if (object_idx() >= model_objects.size())
+        if ((!printable) || object_idx() >= model_objects.size())
             break;
         model_object = model_objects[object_idx()];
 
@@ -1290,9 +1291,16 @@ void GLVolumeCollection::render(GLVolumeCollection::ERenderType type, bool disab
         //shader->set_uniform("print_volume.xy_data", m_render_volume.data);
         //shader->set_uniform("print_volume.z_data", m_render_volume.zs);
 
-        /*shader->set_uniform("print_volume.type", static_cast<int>(m_print_volume.type));
+        if (volume.first->partly_inside) {
+            //only partly inside volume need to be painted with boundary check
+            shader->set_uniform("print_volume.type", static_cast<int>(m_print_volume.type));
             shader->set_uniform("print_volume.xy_data", m_print_volume.data);
-        shader->set_uniform("print_volume.z_data", m_print_volume.zs);*/
+            shader->set_uniform("print_volume.z_data", m_print_volume.zs);
+        }
+        else {
+            //use -1 ad a invalid type
+            shader->set_uniform("print_volume.type", -1);
+        }
         shader->set_uniform("volume_world_matrix", volume.first->world_matrix());
         shader->set_uniform("slope.actived", m_slope.active && !volume.first->is_modifier && !volume.first->is_wipe_tower);
         shader->set_uniform("slope.volume_world_normal_matrix", static_cast<Matrix3f>(volume.first->world_matrix().matrix().block(0, 0, 3, 3).inverse().transpose().cast<float>()));
@@ -1405,6 +1413,7 @@ bool GLVolumeCollection::check_outside_state(const BuildVolume &build_volume, Mo
 
             int64_t comp_id = ((int64_t)volume->composite_id.object_id << 32) | ((int64_t)volume->composite_id.instance_id);
             volume->is_outside = state != BuildVolume::ObjectState::Inside;
+            volume->partly_inside = (state == BuildVolume::ObjectState::Colliding);
             if (volume->printable) {
                 if (overall_state == ModelInstancePVS_Inside && volume->is_outside) {
                     overall_state = ModelInstancePVS_Fully_Outside;
@@ -1459,8 +1468,10 @@ void GLVolumeCollection::reset_outside_state()
 {
     for (GLVolume* volume : this->volumes)
     {
-        if (volume != nullptr)
+        if (volume != nullptr) {
             volume->is_outside = false;
+            volume->partly_inside = false;
+        }
     }
 }
 

src/slic3r/GUI/3DScene.hpp

@@ -371,6 +371,7 @@ public:
 	    bool                shader_outside_printer_detection_enabled : 1;
 	    // Wheter or not this volume is outside print volume.
 	    bool                is_outside : 1;
+        bool                partly_inside : 1;
 	    // Wheter or not this volume has been generated from a modifier
 	    bool                is_modifier : 1;
 	    // Wheter or not this volume has been generated from the wipe tower

src/slic3r/GUI/GLCanvas3D.cpp

@@ -5670,13 +5670,13 @@ void GLCanvas3D::_render_objects(GLVolumeCollection::ERenderType type, bool with
         switch (build_volume.type()) {
         case BuildVolume::Type::Rectangle: {
             const BoundingBox3Base<Vec3d> bed_bb = build_volume.bounding_volume().inflated(BuildVolume::SceneEpsilon);
-            m_volumes.set_print_volume({ 0, // circle
+            m_volumes.set_print_volume({ 0, // Rectangle
                 { float(bed_bb.min.x()), float(bed_bb.min.y()), float(bed_bb.max.x()), float(bed_bb.max.y()) },
                 { 0.0f, float(build_volume.printable_height()) } });
             break;
         }
         case BuildVolume::Type::Circle: {
-            m_volumes.set_print_volume({ 1, // rectangle
+            m_volumes.set_print_volume({ 1, // Circle
                 { unscaled<float>(build_volume.circle().center.x()), unscaled<float>(build_volume.circle().center.y()), unscaled<float>(build_volume.circle().radius + BuildVolume::SceneEpsilon), 0.0f },
                 { 0.0f, float(build_volume.printable_height() + BuildVolume::SceneEpsilon) } });
             break;