Differences

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--- tipsandtricks [2019/08/29 08:04] – [Bones] admin
+++ tipsandtricks [2019/10/03 14:08] – [Threading] admin
@@ Line 20: / Line 20: @@
 The number of polygons you should use depends on the quality you require and the platform you are targeting. For mobile devices, somewhere between 300 and 1500 polygons per mesh will give good results, whereas for desktop platforms the ideal range is about 1500 to 4000. You may need to reduce the polygon count per mesh if the game has lots of characters on screen at any given time.
+===== Changing Position, RotationAngle or Scale =====
+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.
+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.
+<file pascal>
+procedure TForm1.Timer1Timer(Sender: TObject);
+begin
+  GorillaViewport1.BeginUpdate();
+  try
+    GorillaCube1.RotationAngle.Y := GorillaCube1.RotationAngle.Y + 5;
+    GorillaSphere1.Scale.Point := GorillaSphere1.Scale.Point + Point3D(0.1, 0.1, 0.1);
+  finally
+    GorillaViewport1.EndUpdate();
+  end;
+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]]