Differences

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--- tipsandtricks [2019/10/03 13:58] – [Polygon count] admin
+++ tipsandtricks [2019/10/03 14:06] – [Threading] admin
@@ Line 23: / Line 23: @@
 ==== Changing Position, RotationAngle or Scale ====
-Changing one of the transformation settings of a 3D scene object initializes rendering each time.
+Changing one of the transformation settings or visual properties of a 3D scene object initializes rendering implicity.
 So, when you're manipulating more than one object or property this could lead to very bad performance.
-Due to that, GorillaViewport provides the BeginUpdate and EndUpdate methods.
+Therefor we need some way of grouping those operations and to prevent FMX from updating each time.
+Due to that, GorillaViewport provides the BeginUpdate() and EndUpdate() methods.
 Encapsulate your transformations to increase performance.
@@ Line 40: / Line 43: @@
 end;
 </file>
+==== Threading ====
+It is not uncommon to use a thread to compute visual property values. But because FMX (and also Gorilla3D) only runs in main thread, we need to synchronize somehow.
+Synchronization needs to be threadsafe, so everyone uses TThread.Synchronize(nil, DoSync) inside of its thread.
+That's okey for many applications, but the better way is to use messaging or TThread.Queue(nil, DoSync) for this job.
+While "Synchronize" blocks the application to force updating with main thread, "Queue" instead updates the app when there is time for. For further information take a look at: [[http://docwiki.embarcadero.com/Libraries/Rio/en/System.Classes.TThread.Queue]]