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jPCT-AE - a 3d engine for Android => Support => Topic started by: ukrteam on August 20, 2011, 03:59:43 pm

Title: Low performance question
Post by: ukrteam on August 20, 2011, 03:59:43 pm

Hi!
I have a question about jPCT-AE performance. I have create a simple application to test your engine performance - I put 9 models. In single model there were 7707 verticles quantity and 4514 faces. Running this test on HTC Desire HD I got 17-20 fps. Please, tell me if this low fps normal for jPCT-AE? And is it possible to improve performance?
Thx for your answer!

Title: Re: Low performance question
Post by: EgonOlsen on August 21, 2011, 10:38:50 am

It's not normal for the engine, it's normal for what you are doing. Always consider that you are on a mobile, low power device. You are rendering around 70,000 vertices/40,000 polygons per frame, which isn't that much but it's not really low polygon either.

However, you can try a few things to speed it up:

• Decrease vertex/polygon count of the model
• Force the engine to use indexed geometry (Object3D.forceGeometryIndices(true);)
• Use shared meshes and shared compiled data if possible (http://www.jpct.net/wiki/index.php/Reducing_memory_usage#Make_objects_share_meshes_in_main_memory (http://www.jpct.net/wiki/index.php/Reducing_memory_usage#Make_objects_share_meshes_in_main_memory))
• ...?

Title: Re: Low performance question
Post by: Alexey on August 29, 2011, 11:32:34 am

What would not create a new topic, ask here - for example, some objects in camera focus, camera should rotate around its,  for performance better rotate camera or objects? or a small difference?

Title: Re: Low performance question
Post by: EgonOlsen on August 29, 2011, 12:11:08 pm

There's no difference between these two approaches. In the end, it all comes down to a transformation matrix/object