diff --git a/resources/shaders/gouraud_light.fs b/resources/shaders/gouraud_light.fs
index 1a58abc85..970185a00 100644
--- a/resources/shaders/gouraud_light.fs
+++ b/resources/shaders/gouraud_light.fs
@@ -1,11 +1,12 @@
 #version 110
 
 uniform vec4 uniform_color;
+uniform float emission_factor;
 
 // x = tainted, y = specular;
 varying vec2 intensity;
 
 void main()
 {
-    gl_FragColor = vec4(vec3(intensity.y, intensity.y, intensity.y) + uniform_color.rgb * intensity.x, uniform_color.a);
+    gl_FragColor = vec4(vec3(intensity.y) + uniform_color.rgb * (intensity.x + emission_factor), uniform_color.a);
 }
diff --git a/src/slic3r/GUI/Gizmos/GLGizmoBase.cpp b/src/slic3r/GUI/Gizmos/GLGizmoBase.cpp
index ca9b2408c..b018c0829 100644
--- a/src/slic3r/GUI/Gizmos/GLGizmoBase.cpp
+++ b/src/slic3r/GUI/Gizmos/GLGizmoBase.cpp
@@ -24,10 +24,7 @@ GLGizmoBase::Grabber::Grabber()
     , dragging(false)
     , enabled(true)
 {
-    color[0] = 1.0f;
-    color[1] = 1.0f;
-    color[2] = 1.0f;
-    color[3] = 1.0f;
+    color = { 1.0f, 1.0f, 1.0f, 1.0f };
     TriangleMesh cube = make_cube(1., 1., 1.);
     cube.translate(Vec3f(-0.5, -0.5, -0.5));
     VBOCube.init_from(cube);
@@ -35,18 +32,18 @@ GLGizmoBase::Grabber::Grabber()
 
 void GLGizmoBase::Grabber::render(bool hover, float size) const
 {
-    float render_color[4];
+    std::array<float, 4> render_color;
     if (hover)
     {
-        render_color[0] = 1.0f - color[0];
-        render_color[1] = 1.0f - color[1];
-        render_color[2] = 1.0f - color[2];
+        render_color[0] = (1.0f - color[0]);
+        render_color[1] = (1.0f - color[1]);
+        render_color[2] = (1.0f - color[2]);
         render_color[3] = color[3];
     }
     else
-        ::memcpy((void*)render_color, (const void*)color, 4 * sizeof(float));
+        render_color = color;
 
-    render(size, render_color, true);
+    render(size, render_color, false);
 }
 
 float GLGizmoBase::Grabber::get_half_size(float size) const
@@ -59,14 +56,18 @@ float GLGizmoBase::Grabber::get_dragging_half_size(float size) const
     return get_half_size(size) * DraggingScaleFactor;
 }
 
-void GLGizmoBase::Grabber::render(float size, const float* render_color, bool use_lighting) const
+void GLGizmoBase::Grabber::render(float size, const std::array<float, 4>& render_color, bool picking) const
 {
     float fullsize = 2 * (dragging ? get_dragging_half_size(size) : get_half_size(size));
 
-    if (use_lighting)
+    if (! picking)
         glsafe(::glEnable(GL_LIGHTING));
 
-    glsafe(::glColor4fv(render_color));
+    GLShaderProgram* shader = picking ? nullptr : wxGetApp().get_current_shader();
+    if (shader)
+        shader->set_uniform("uniform_color", render_color);
+    else
+        glsafe(::glColor4fv(render_color.data())); // picking
 
     glsafe(::glPushMatrix());
     glsafe(::glTranslated(center(0), center(1), center(2)));
@@ -77,7 +78,7 @@ void GLGizmoBase::Grabber::render(float size, const float* render_color, bool us
     VBOCube.render();
     glsafe(::glPopMatrix());
 
-    if (use_lighting)
+    if (! picking)
         glsafe(::glDisable(GL_LIGHTING));
 }
 
@@ -188,11 +189,18 @@ void GLGizmoBase::render_grabbers(const BoundingBoxf3& box) const
 
 void GLGizmoBase::render_grabbers(float size) const
 {
+    GLShaderProgram* shader = wxGetApp().get_shader("gouraud_light");
+    if (! shader)
+        return;
+    shader->start_using();
+    shader->set_uniform("emission_factor", 0.1);
     for (int i = 0; i < (int)m_grabbers.size(); ++i)
     {
         if (m_grabbers[i].enabled)
             m_grabbers[i].render((m_hover_id == i), size);
     }
+    shader->set_uniform("emission_factor", 0.);
+    shader->stop_using();
 }
 
 void GLGizmoBase::render_grabbers_for_picking(const BoundingBoxf3& box) const
@@ -204,10 +212,7 @@ void GLGizmoBase::render_grabbers_for_picking(const BoundingBoxf3& box) const
         if (m_grabbers[i].enabled)
         {
             std::array<float, 4> color = picking_color_component(i);
-            m_grabbers[i].color[0] = color[0];
-            m_grabbers[i].color[1] = color[1];
-            m_grabbers[i].color[2] = color[2];
-            m_grabbers[i].color[3] = color[3];
+            m_grabbers[i].color = color;
             m_grabbers[i].render_for_picking(mean_size);
         }
     }
diff --git a/src/slic3r/GUI/Gizmos/GLGizmoBase.hpp b/src/slic3r/GUI/Gizmos/GLGizmoBase.hpp
index b49619470..7fdae1598 100644
--- a/src/slic3r/GUI/Gizmos/GLGizmoBase.hpp
+++ b/src/slic3r/GUI/Gizmos/GLGizmoBase.hpp
@@ -9,9 +9,6 @@
 #include <cereal/archives/binary.hpp>
 
 class wxWindow;
-class GLUquadric;
-typedef class GLUquadric GLUquadricObj;
-
 
 namespace Slic3r {
 
@@ -53,20 +50,20 @@ protected:
 
         Vec3d center;
         Vec3d angles;
-        float color[4];
+        std::array<float, 4> color;
         bool enabled;
         bool dragging;
 
         Grabber();
 
         void render(bool hover, float size) const;
-        void render_for_picking(float size) const { render(size, color, false); }
+        void render_for_picking(float size) const { render(size, color, true); }
 
         float get_half_size(float size) const;
         float get_dragging_half_size(float size) const;
 
     private:
-        void render(float size, const float* render_color, bool use_lighting) const;
+        void render(float size, const std::array<float, 4>& render_color, bool picking) const;
     };
 
 public:
diff --git a/src/slic3r/GUI/Gizmos/GLGizmoCut.cpp b/src/slic3r/GUI/Gizmos/GLGizmoCut.cpp
index d43b0f24e..ffa389bb2 100644
--- a/src/slic3r/GUI/Gizmos/GLGizmoCut.cpp
+++ b/src/slic3r/GUI/Gizmos/GLGizmoCut.cpp
@@ -133,7 +133,7 @@ void GLGizmoCut::on_render() const
     ::glVertex3dv(m_grabbers[0].center.data());
     glsafe(::glEnd());
 
-    std::copy(std::begin(GrabberColor), std::end(GrabberColor), m_grabbers[0].color);
+    m_grabbers[0].color = GrabberColor;
     m_grabbers[0].render(m_hover_id == 0, (float)((box.size()(0) + box.size()(1) + box.size()(2)) / 3.0));
 }
 
diff --git a/src/slic3r/GUI/Gizmos/GLGizmoMove.cpp b/src/slic3r/GUI/Gizmos/GLGizmoMove.cpp
index 0b65982b7..2385b5e5d 100644
--- a/src/slic3r/GUI/Gizmos/GLGizmoMove.cpp
+++ b/src/slic3r/GUI/Gizmos/GLGizmoMove.cpp
@@ -100,15 +100,15 @@ void GLGizmoMove3D::on_render() const
 
     // x axis
     m_grabbers[0].center = Vec3d(box.max(0) + Offset, center(1), center(2));
-    ::memcpy((void*)m_grabbers[0].color, (const void*)&AXES_COLOR[0], 4 * sizeof(float));
+    ::memcpy((void*)m_grabbers[0].color.data(), (const void*)&AXES_COLOR[0], 4 * sizeof(float));
 
     // y axis
     m_grabbers[1].center = Vec3d(center(0), box.max(1) + Offset, center(2));
-    ::memcpy((void*)m_grabbers[1].color, (const void*)&AXES_COLOR[1], 4 * sizeof(float));
+    ::memcpy((void*)m_grabbers[1].color.data(), (const void*)&AXES_COLOR[1], 4 * sizeof(float));
 
     // z axis
     m_grabbers[2].center = Vec3d(center(0), center(1), box.max(2) + Offset);
-    ::memcpy((void*)m_grabbers[2].color, (const void*)&AXES_COLOR[2], 4 * sizeof(float));
+    ::memcpy((void*)m_grabbers[2].color.data(), (const void*)&AXES_COLOR[2], 4 * sizeof(float));
 
     glsafe(::glLineWidth((m_hover_id != -1) ? 2.0f : 1.5f));
 
@@ -194,8 +194,7 @@ void GLGizmoMove3D::render_grabber_extension(Axis axis, const BoundingBoxf3& box
     float mean_size = (float)((box.size()(0) + box.size()(1) + box.size()(2)) / 3.0);
     double size = m_dragging ? (double)m_grabbers[axis].get_dragging_half_size(mean_size) : (double)m_grabbers[axis].get_half_size(mean_size);
 
-    float color[4];
-    ::memcpy((void*)color, (const void*)m_grabbers[axis].color, 4 * sizeof(float));
+    std::array<float, 4> color = m_grabbers[axis].color;
     if (!picking && (m_hover_id != -1))
     {
         color[0] = 1.0f - color[0];
@@ -207,7 +206,7 @@ void GLGizmoMove3D::render_grabber_extension(Axis axis, const BoundingBoxf3& box
     if (!picking)
         glsafe(::glEnable(GL_LIGHTING));
 
-    glsafe(::glColor4fv(color));
+    glsafe(::glColor4fv(color.data()));
     glsafe(::glPushMatrix());
     glsafe(::glTranslated(m_grabbers[axis].center(0), m_grabbers[axis].center(1), m_grabbers[axis].center(2)));
     if (axis == X)
diff --git a/src/slic3r/GUI/Gizmos/GLGizmoRotate.cpp b/src/slic3r/GUI/Gizmos/GLGizmoRotate.cpp
index eb026a8e8..758ab7529 100644
--- a/src/slic3r/GUI/Gizmos/GLGizmoRotate.cpp
+++ b/src/slic3r/GUI/Gizmos/GLGizmoRotate.cpp
@@ -318,7 +318,7 @@ void GLGizmoRotate::render_grabber(const BoundingBoxf3& box) const
     ::glVertex3dv(m_grabbers[0].center.data());
     glsafe(::glEnd());
 
-    ::memcpy((void*)m_grabbers[0].color, (const void*)m_highlight_color, 4 * sizeof(float));
+    ::memcpy((void*)m_grabbers[0].color.data(), (const void*)m_highlight_color, 4 * sizeof(float));
     render_grabbers(box);
 }
 
@@ -327,8 +327,7 @@ void GLGizmoRotate::render_grabber_extension(const BoundingBoxf3& box, bool pick
     float mean_size = (float)((box.size()(0) + box.size()(1) + box.size()(2)) / 3.0);
     double size = m_dragging ? (double)m_grabbers[0].get_dragging_half_size(mean_size) : (double)m_grabbers[0].get_half_size(mean_size);
 
-    float color[4];
-    ::memcpy((void*)color, (const void*)m_grabbers[0].color, 4 * sizeof(float));
+    std::array<float, 4> color = m_grabbers[0].color;
     if (!picking && (m_hover_id != -1))
     {
         color[0] = 1.0f - color[0];
@@ -339,7 +338,7 @@ void GLGizmoRotate::render_grabber_extension(const BoundingBoxf3& box, bool pick
     if (!picking)
         glsafe(::glEnable(GL_LIGHTING));
 
-    glsafe(::glColor4fv(color));
+    glsafe(::glColor4fv(color.data()));
     glsafe(::glPushMatrix());
     glsafe(::glTranslated(m_grabbers[0].center(0), m_grabbers[0].center(1), m_grabbers[0].center(2)));
     glsafe(::glRotated(Geometry::rad2deg(m_angle), 0.0, 0.0, 1.0));
diff --git a/src/slic3r/GUI/Gizmos/GLGizmoScale.cpp b/src/slic3r/GUI/Gizmos/GLGizmoScale.cpp
index fa2069d0a..425b53f85 100644
--- a/src/slic3r/GUI/Gizmos/GLGizmoScale.cpp
+++ b/src/slic3r/GUI/Gizmos/GLGizmoScale.cpp
@@ -173,20 +173,20 @@ void GLGizmoScale3D::on_render() const
     // x axis
     m_grabbers[0].center = m_transform * Vec3d(m_box.min(0), center(1), center(2)) - offset_x;
     m_grabbers[1].center = m_transform * Vec3d(m_box.max(0), center(1), center(2)) + offset_x;
-    ::memcpy((void*)m_grabbers[0].color, (ctrl_down && (m_hover_id == 1)) ? (const void*)CONSTRAINED_COLOR : (const void*)&AXES_COLOR[0], 4 * sizeof(float));
-    ::memcpy((void*)m_grabbers[1].color, (ctrl_down && (m_hover_id == 0)) ? (const void*)CONSTRAINED_COLOR : (const void*)&AXES_COLOR[0], 4 * sizeof(float));
+    ::memcpy((void*)m_grabbers[0].color.data(), (ctrl_down && (m_hover_id == 1)) ? (const void*)CONSTRAINED_COLOR : (const void*)&AXES_COLOR[0], 4 * sizeof(float));
+    ::memcpy((void*)m_grabbers[1].color.data(), (ctrl_down && (m_hover_id == 0)) ? (const void*)CONSTRAINED_COLOR : (const void*)&AXES_COLOR[0], 4 * sizeof(float));
 
     // y axis
     m_grabbers[2].center = m_transform * Vec3d(center(0), m_box.min(1), center(2)) - offset_y;
     m_grabbers[3].center = m_transform * Vec3d(center(0), m_box.max(1), center(2)) + offset_y;
-    ::memcpy((void*)m_grabbers[2].color, (ctrl_down && (m_hover_id == 3)) ? (const void*)CONSTRAINED_COLOR : (const void*)&AXES_COLOR[1], 4 * sizeof(float));
-    ::memcpy((void*)m_grabbers[3].color, (ctrl_down && (m_hover_id == 2)) ? (const void*)CONSTRAINED_COLOR : (const void*)&AXES_COLOR[1], 4 * sizeof(float));
+    ::memcpy((void*)m_grabbers[2].color.data(), (ctrl_down && (m_hover_id == 3)) ? (const void*)CONSTRAINED_COLOR : (const void*)&AXES_COLOR[1], 4 * sizeof(float));
+    ::memcpy((void*)m_grabbers[3].color.data(), (ctrl_down && (m_hover_id == 2)) ? (const void*)CONSTRAINED_COLOR : (const void*)&AXES_COLOR[1], 4 * sizeof(float));
 
     // z axis
     m_grabbers[4].center = m_transform * Vec3d(center(0), center(1), m_box.min(2)) - offset_z;
     m_grabbers[5].center = m_transform * Vec3d(center(0), center(1), m_box.max(2)) + offset_z;
-    ::memcpy((void*)m_grabbers[4].color, (ctrl_down && (m_hover_id == 5)) ? (const void*)CONSTRAINED_COLOR : (const void*)&AXES_COLOR[2], 4 * sizeof(float));
-    ::memcpy((void*)m_grabbers[5].color, (ctrl_down && (m_hover_id == 4)) ? (const void*)CONSTRAINED_COLOR : (const void*)&AXES_COLOR[2], 4 * sizeof(float));
+    ::memcpy((void*)m_grabbers[4].color.data(), (ctrl_down && (m_hover_id == 5)) ? (const void*)CONSTRAINED_COLOR : (const void*)&AXES_COLOR[2], 4 * sizeof(float));
+    ::memcpy((void*)m_grabbers[5].color.data(), (ctrl_down && (m_hover_id == 4)) ? (const void*)CONSTRAINED_COLOR : (const void*)&AXES_COLOR[2], 4 * sizeof(float));
 
     // uniform
     m_grabbers[6].center = m_transform * Vec3d(m_box.min(0), m_box.min(1), center(2)) - offset_x - offset_y;
@@ -195,7 +195,7 @@ void GLGizmoScale3D::on_render() const
     m_grabbers[9].center = m_transform * Vec3d(m_box.min(0), m_box.max(1), center(2)) - offset_x + offset_y;
     for (int i = 6; i < 10; ++i)
     {
-        ::memcpy((void*)m_grabbers[i].color, (const void*)m_highlight_color, 4 * sizeof(float));
+        ::memcpy((void*)m_grabbers[i].color.data(), (const void*)m_highlight_color, 4 * sizeof(float));
     }
 
     // sets grabbers orientation
@@ -215,17 +215,17 @@ void GLGizmoScale3D::on_render() const
         // draw connections
         if (m_grabbers[0].enabled && m_grabbers[1].enabled)
         {
-            glsafe(::glColor4fv(m_grabbers[0].color));
+            glsafe(::glColor4fv(m_grabbers[0].color.data()));
             render_grabbers_connection(0, 1);
         }
         if (m_grabbers[2].enabled && m_grabbers[3].enabled)
         {
-            glsafe(::glColor4fv(m_grabbers[2].color));
+            glsafe(::glColor4fv(m_grabbers[2].color.data()));
             render_grabbers_connection(2, 3);
         }
         if (m_grabbers[4].enabled && m_grabbers[5].enabled)
         {
-            glsafe(::glColor4fv(m_grabbers[4].color));
+            glsafe(::glColor4fv(m_grabbers[4].color.data()));
             render_grabbers_connection(4, 5);
         }
         glsafe(::glColor4fv(m_base_color));
@@ -239,7 +239,7 @@ void GLGizmoScale3D::on_render() const
     else if ((m_hover_id == 0) || (m_hover_id == 1))
     {
         // draw connection
-        glsafe(::glColor4fv(m_grabbers[0].color));
+        glsafe(::glColor4fv(m_grabbers[0].color.data()));
         render_grabbers_connection(0, 1);
         // draw grabbers
         m_grabbers[0].render(true, grabber_mean_size);
@@ -248,7 +248,7 @@ void GLGizmoScale3D::on_render() const
     else if ((m_hover_id == 2) || (m_hover_id == 3))
     {
         // draw connection
-        glsafe(::glColor4fv(m_grabbers[2].color));
+        glsafe(::glColor4fv(m_grabbers[2].color.data()));
         render_grabbers_connection(2, 3);
         // draw grabbers
         m_grabbers[2].render(true, grabber_mean_size);
@@ -257,7 +257,7 @@ void GLGizmoScale3D::on_render() const
     else if ((m_hover_id == 4) || (m_hover_id == 5))
     {
         // draw connection
-        glsafe(::glColor4fv(m_grabbers[4].color));
+        glsafe(::glColor4fv(m_grabbers[4].color.data()));
         render_grabbers_connection(4, 5);
         // draw grabbers
         m_grabbers[4].render(true, grabber_mean_size);
diff --git a/src/slic3r/GUI/Gizmos/GLGizmoSlaSupports.cpp b/src/slic3r/GUI/Gizmos/GLGizmoSlaSupports.cpp
index ac63d6b72..68fd3a6c0 100644
--- a/src/slic3r/GUI/Gizmos/GLGizmoSlaSupports.cpp
+++ b/src/slic3r/GUI/Gizmos/GLGizmoSlaSupports.cpp
@@ -121,7 +121,12 @@ void GLGizmoSlaSupports::render_points(const Selection& selection, bool picking)
     GLShaderProgram* shader = picking ? nullptr : wxGetApp().get_shader("gouraud_light");
     if (shader)
         shader->start_using();
-    ScopeGuard guard([shader]() { if (shader) shader->stop_using(); });
+    ScopeGuard guard([shader]() {
+        if (shader) {
+            shader->set_uniform("emission_factor", 0.);
+            shader->stop_using();
+        }
+    });
 
     const GLVolume* vol = selection.get_volume(*selection.get_volume_idxs().begin());
     const Transform3d& instance_scaling_matrix_inverse = vol->get_instance_transformation().get_matrix(true, true, false, true).inverse();
@@ -162,8 +167,10 @@ void GLGizmoSlaSupports::render_points(const Selection& selection, bool picking)
                     render_color = { 0.5f, 0.5f, 0.5f, 1.f };
             }
         }
-        if (shader && ! picking)
+        if (shader && ! picking) {
             shader->set_uniform("uniform_color", render_color);
+            shader->set_uniform("emission_factor", 0.5);
+        }
         else // picking
             glsafe(::glColor4fv(render_color.data()));
 
@@ -219,8 +226,10 @@ void GLGizmoSlaSupports::render_points(const Selection& selection, bool picking)
         render_color[1] = 0.7f;
         render_color[2] = 0.7f;
         render_color[3] = 0.7f;
-        if (shader)
+        if (shader) {
             shader->set_uniform("uniform_color", render_color);
+            shader->set_uniform("emission_factor", 0.5);
+        }
         for (const sla::DrainHole& drain_hole : m_c->selection_info()->model_object()->sla_drain_holes) {
             if (is_mesh_point_clipped(drain_hole.pos.cast<double>()))
                 continue;