fix BGE bug #8309: After Parent Object added to the visual layer, Child Camera won't follow.

This bug fix is made of two parts:
1) It's now possible to dynamically add a camera.
2) Empty camera name on a SetCamera actuator now points to the actuator's parent object if this object is a camera. 
This trick is useful to make current a dynamically created camera: just add a SetCamera actuator on the camera itself and leave the name empty. Later, when the camera is added in the scene with an AddObject actuator, either directly or via a parent object, you just need to activate the actuator to make the newly created camera current. If you set a name on a SetCamera actuator, it will always point to the original camera, even after replication.

1 files changed, 9 insertions, 0 deletions

diff --git a/source/gameengine/Ketsji/KX_SceneActuator.cpp b/source/gameengine/Ketsji/KX_SceneActuator.cpp
index a37fce434be..7a9d144e92f 100644
--- a/source/gameengine/Ketsji/KX_SceneActuator.cpp
+++ b/source/gameengine/Ketsji/KX_SceneActuator.cpp
@@ -105,6 +105,15 @@ bool KX_SceneActuator::Update()
 		{
 			m_scene->SetActiveCamera(m_camera);
 		}
+		else
+		{
+			// if no camera is set and the parent object is a camera, use it as the camera
+			SCA_IObject* parent = GetParent();
+			if (parent->isA(&KX_Camera::Type))
+			{
+				m_scene->SetActiveCamera((KX_Camera*)parent);
+			}
+		}
 		break;
 	default:
 		break;