Fixed Text3D in face camera mode becoming invisible after being out of the view frustum due to using old camera position.

Engine/Graphics/Skybox.cpp

@@ -35,7 +35,8 @@ namespace Urho3D
 OBJECTTYPESTATIC(Skybox);
 
 Skybox::Skybox(Context* context) :
-    StaticModel(context)
+    StaticModel(context),
+    customWorldTransform_(Matrix3x4::IDENTITY)
 {
 }
 

Engine/UI/Text3D.cpp

@@ -48,6 +48,7 @@ Text3D::Text3D(Context* context) :
     Drawable(context, DRAWABLE_GEOMETRY),
     text_(context),
     vertexBuffer_(new VertexBuffer(context_)),
+    customWorldTransform_(Matrix3x4::IDENTITY),
     faceCamera_(false),
     textDirty_(true),
     geometryDirty_(true)
@@ -352,8 +353,9 @@ void Text3D::OnWorldBoundingBoxUpdate()
     if (textDirty_)
         UpdateTextBatches();
     
-    worldBoundingBox_ = faceCamera_ ? boundingBox_.Transformed(customWorldTransform_) :
-        boundingBox_.Transformed(node_->GetWorldTransform());
+    // In face camera mode, use the last camera rotation to build the world bounding box
+    worldBoundingBox_ = boundingBox_.Transformed(faceCamera_ ? Matrix3x4(node_->GetWorldPosition(),
+        customWorldTransform_.Rotation(), node_->GetWorldScale()) : node_->GetWorldTransform());
 }
 
 void Text3D::MarkTextDirty()

Engine/UI/Text3D.h

@@ -157,7 +157,7 @@ private:
     PODVector<float> uiVertexData_;
     /// Local-space bounding box.
     BoundingBox boundingBox_;
-    /// Custom world transform.
+    /// Custom world transform for facing the camera automatically.
     Matrix3x4 customWorldTransform_;
     /// Face camera flag.
     bool faceCamera_;