Hide manipulator widgets when the selected object is behind camera

Task-number: QT3DS-3864
Change-Id: I1c1c7e22eef6905827243b449764cdca0c44932c
Reviewed-by: Jere Tuliniemi <jere.tuliniemi@qt.io>
Reviewed-by: Mahmoud Badri <mahmoud.badri@qt.io>
Reviewed-by: Antti Määttä <antti.maatta@qt.io>

6 files changed, 23 insertions, 1 deletions

diff --git a/src/Authoring/Qt3DStudio/Render/StudioRendererTranslation.cpp b/src/Authoring/Qt3DStudio/Render/StudioRendererTranslation.cpp
index 30df1406..a857238f 100644
--- a/src/Authoring/Qt3DStudio/Render/StudioRendererTranslation.cpp
+++ b/src/Authoring/Qt3DStudio/Render/StudioRendererTranslation.cpp
@@ -3127,7 +3127,8 @@ SStudioPickValue STranslation::Pick(CPt inMouseCoords, TranslationSelectMode::En
                                      || m_LastRenderedWidget->GetNode().m_Type
                                      == GraphObjectTypes::Light
                                      || m_LastRenderedWidget->GetNode().m_Type
-                                     == GraphObjectTypes::Camera)) {
+                                     == GraphObjectTypes::Camera)
+                && !m_LastRenderedWidget->isNodeBehindCamera()) {
             Option<QT3DSU32> picked = PickWidget(inMouseCoords, inSelectMode,
                                                  *m_LastRenderedWidget);
             if (picked.hasValue()) {
diff --git a/src/Authoring/Qt3DStudio/Render/StudioRotationWidget.cpp b/src/Authoring/Qt3DStudio/Render/StudioRotationWidget.cpp
index f3e06cd6..544841f9 100644
--- a/src/Authoring/Qt3DStudio/Render/StudioRotationWidget.cpp
+++ b/src/Authoring/Qt3DStudio/Render/StudioRotationWidget.cpp
@@ -279,6 +279,10 @@ struct SRotationWidget : public SStudioWidgetImpl<StudioWidgetTypes::Rotation>
         QT3DSVec3 theRingColor(QT3DSVec3(.8f, .8f, .8f));
 
         QT3DSMat44 theMVP = TBase::SetupMVP(inWidgetContext);
+
+        if (isNodeBehindCamera())
+            return;
+
         inRenderContext.SetCullingEnabled(false);
         QT3DSMat44 theCameraMVP = m_WidgetInfo.m_LayerProjection * m_CameraTranslationScale;
 
diff --git a/src/Authoring/Qt3DStudio/Render/StudioScaleWidget.cpp b/src/Authoring/Qt3DStudio/Render/StudioScaleWidget.cpp
index 9b5eec1f..52d834e3 100644
--- a/src/Authoring/Qt3DStudio/Render/StudioScaleWidget.cpp
+++ b/src/Authoring/Qt3DStudio/Render/StudioScaleWidget.cpp
@@ -189,6 +189,10 @@ struct SScaleWidget : public SStudioWidgetImpl<StudioWidgetTypes::Scale>
         }
 
         QT3DSMat44 theMVP = TBase::SetupMVP(inWidgetContext);
+
+        if (isNodeBehindCamera())
+            return;
+
         inRenderContext.SetBlendingEnabled(false);
         inRenderContext.SetDepthTestEnabled(true);
         inRenderContext.SetDepthWriteEnabled(true);
diff --git a/src/Authoring/Qt3DStudio/Render/StudioTranslationWidget.cpp b/src/Authoring/Qt3DStudio/Render/StudioTranslationWidget.cpp
index 0897a866..0ef99d41 100644
--- a/src/Authoring/Qt3DStudio/Render/StudioTranslationWidget.cpp
+++ b/src/Authoring/Qt3DStudio/Render/StudioTranslationWidget.cpp
@@ -109,6 +109,10 @@ struct STranslationWidget : public SStudioWidgetImpl<StudioWidgetTypes::Translat
                                  0.0f, 1.0f, "TranslationWidgetZPlane");
         }
         QT3DSMat44 theMVP = TBase::SetupMVP(inWidgetContext);
+
+        if (isNodeBehindCamera())
+            return;
+
         inRenderContext.SetBlendingEnabled(false);
         inRenderContext.SetDepthTestEnabled(true);
         inRenderContext.SetDepthWriteEnabled(true);
diff --git a/src/Authoring/Qt3DStudio/Render/StudioWidget.h b/src/Authoring/Qt3DStudio/Render/StudioWidget.h
index 0d40f195..897c71cf 100644
--- a/src/Authoring/Qt3DStudio/Render/StudioWidget.h
+++ b/src/Authoring/Qt3DStudio/Render/StudioWidget.h
@@ -128,6 +128,7 @@ namespace widgets {
         virtual void SetRotationEdges(const QT3DSVec3 &inStartDirection, const QT3DSVec3 &inRotationAxis,
                                       QT3DSF32 inAngleRad, QT3DSF32 inEndLineLen) = 0;
         virtual void ClearRotationEdges() = 0;
+        virtual bool isNodeBehindCamera() const = 0;
 
         static IStudioWidget &CreateTranslationWidget(NVAllocatorCallback &inAlloc);
         static IStudioWidget &CreateRotationWidget(NVAllocatorCallback &inAlloc);
diff --git a/src/Authoring/Qt3DStudio/Render/StudioWidgetImpl.h b/src/Authoring/Qt3DStudio/Render/StudioWidgetImpl.h
index b78c1edf..1ade819a 100644
--- a/src/Authoring/Qt3DStudio/Render/StudioWidgetImpl.h
+++ b/src/Authoring/Qt3DStudio/Render/StudioWidgetImpl.h
@@ -36,6 +36,7 @@
 
 #include "Qt3DSRenderNode.h"
 #include "Qt3DSRenderShaderCodeGeneratorV2.h"
+#include "Qt3DSRenderCamera.h"
 #include "StudioPreferences.h"
 
 namespace qt3ds {
@@ -327,6 +328,13 @@ namespace widgets {
 
         void ClearRotationEdges() override { m_RotationWedge = Empty(); }
 
+        bool isNodeBehindCamera() const override
+        {
+            return m_WidgetInfo.m_Camera && m_Node
+                    && m_WidgetInfo.m_Camera->GetDirection().dot(
+                        (m_Node->GetGlobalPos() - m_WidgetInfo.m_Camera->GetGlobalPos())) > 0.f;
+        }
+
         static inline QT3DSVec3 ToGLSLColor(const QColor &c)
         {
             return QT3DSVec3(c.redF(), c.greenF(), c.blueF());