Someone on pv3d list posted this: http://www.tsoin.com/asblog/2008/11/18/comparatifs-moteurs-3d-et-le-plus-performant-est/
papervision3d takes 282MB memory while away3d only takes 32mb? I think that would mean those optimizations are already in Away3D :) -Pete On Wed, Nov 19, 2008 at 10:03 AM, Ian Stokes <[EMAIL PROTECTED]> wrote: > > HI, > > this is a letter posted on the PV3d list showing how a developer > modded PV3D garbage collection, even though its a different engine, > and might not apply, I thought I'd paste it here in case anyone else > wants to look at the techniques; > > 294913 Number3D (around 30% of total memory usage of the game) > > 96649 Vertex3DInstance (15% of total memory usage) > > 95508 Dictionaries (10% of total memory usage) > > 95433 Vertex3D (20% of total memory usage) > > = > > 582503 objects in memory for our golfers geometry! > > > > Given how flash has a mark-sweep garbage collector, this was giving some > > interesting performance issues related to garbage collection. > > > > So the steps we took to optimise it were: > > - Each Vertex3D object has a Dictionary instance that is used compute > > normals. The normals computed happens once, however the dictionary was > not > > not free'd. So we Saved ~90.000 Dictionary objects there > > > > - Vertex3DInstance has an unused normal instantied to 0,0,0, i.e. a > > Number3D, it's never referenced or used outside Vertex3DInstance removed > > this: removed ~90.000 Number3D instances > > > > - Vertex3D caches a "position" as Number3D that is used once for Normal > > calculation, this was never freed. I removed this and just used original > > x,y,z. saved as i did not see a need for this indirection. around 90.000 > > further Number3D instances removed > > > > - Not sure about the safety of this one, however the normal in Vertex3D > was > > not referenced anywhere other than being initialised. So in the end i got > > rid of this. Another 90.000 more Number3D instances saved > > > > - last but not least, every Vertex3D has a Vertex3DInstance object used > for > > the rendered onscreen position. Again, this indirection did not seem > > neceserry, so I merged these 2 classes into 1 and same object rather than > > child object which saved alot more unneeded object instances and > references > > > > So these combined optimisations ended us up with: > > - 96649 instances of Vertex3D (all vertexes for all frames naturally) > > - 7398 Number3D instances > > > > This ended up saving us nearly 500.000 object instances and halving our > > apps > > memory usage (reported by flex profiler) from 30MB to 15MB. It also > greatly > > improved performance of garbage collection. > > > > You can see a summary from the profiling here: > > http://www.kimdanielarthur.com/tmp/papervision_optimise.gif > > > > Hopefully useful if anyone runs into similar behaviour! > > > > Kim Daniel Arthur > > > > ps. > > Thanks again for a great 3D library its really brought extra life to our > > games > > -- ___________________ Actionscript 3.0 Flash 3D Graphics Engine HTTP://AWAY3D.COM
