implement mustExecute for Raytracing features

src/Mod/Raytracing/App/LuxFeature.cpp

@@ -52,6 +52,17 @@ LuxFeature::LuxFeature(void)
     ADD_PROPERTY(Transparency,(0));
 }
 
+short LuxFeature::mustExecute() const
+{
+    if (Source.isTouched())
+        return 1;
+    if (Color.isTouched())
+        return 1;
+    if (Transparency.isTouched())
+        return 1;
+    return RaySegment::mustExecute();
+}
+
 App::DocumentObjectExecReturn *LuxFeature::execute(void)
 {
     std::stringstream result;

src/Mod/Raytracing/App/LuxFeature.h

@@ -53,6 +53,7 @@ public:
 
     /** @name methods override Feature */
     //@{
+    short mustExecute() const;
     /// recalculate the Feature
     App::DocumentObjectExecReturn *execute(void);
 

src/Mod/Raytracing/App/RayFeature.cpp

@@ -50,6 +50,17 @@ RayFeature::RayFeature(void)
     ADD_PROPERTY(Transparency,(0));
 }
 
+short RayFeature::mustExecute() const
+{
+    if (Source.isTouched())
+        return 1;
+    if (Color.isTouched())
+        return 1;
+    if (Transparency.isTouched())
+        return 1;
+    return RaySegment::mustExecute();
+}
+
 App::DocumentObjectExecReturn *RayFeature::execute(void)
 {
     std::stringstream result;

src/Mod/Raytracing/App/RayFeature.h

@@ -53,6 +53,7 @@ public:
 
     /** @name methods override Feature */
     //@{
+    short mustExecute() const;
     /// recalculate the Feature
     App::DocumentObjectExecReturn *execute(void);