cocos2d for iPhone

A fast, easy to use, free, and community supported 2D game engine

1. 

   setrio
   Member

   Hello.

   I want some guidelines to optimize the textures of the game. I get the different sprites from the art team (exported from flash). In the first version used Zwoptex to create the spritesheets. The problem with this is that as you may know takes a lot of RAM memory space (i have a lot of sprites for each enemy in the game) because the spritesheets are big (1024x1024 mostly). So i tried to optimize the textures using RGBA4444 and Ditering with TexturePacker generating the pvr image. This reduces the memory consumption to half but get some artifacts in the sprites, and also still wants to reduce memory size.

   I'm not good with textures and art files but i read some articules that give me the idea that can't get a much more memory optimization becuase reducing the texture format more gets really bad sprites.

   Any ideas/reading?

   Thks!

   Posted 1 year ago #
2. 

   Andreas Loew
   Member

   On iPhone you could not go under 16 bit textures.

   There is PVRTC (also supported in TexturePacker that you already have) but this makes really ugly artefacts.

   You can play around with the different options in TexturePacker to get better quality: Linear vs Nearest Neighbour quantization or Floyd Steinberg vs Atkinson dithering. Next major update will allow you to choose the best optimization on a sprite base - but thats not yet available.

   Color reduction always comes with a reduction in image quality. Except your art team uses only RGBA4444 save colors.

   For background images with no transparency you could also use RGB565 this das much more color values and introduces less artefacts.

   RGBA5551 has more colors than RGBA4444 but only hard transparency - either on or off.

   When images are moved the dithering is not so obvious than on static backgrounds. It might even completely invisible if objects move fast enough.

   Another way of reducing memory size is to split graphics into smaller parts and build compound sprites consisting of several items. E.g. if you have a hero with wings and face animations separate the body, face and wings and animate them each. Then add the child sprites to the parent sprite.

   Posted 1 year ago #
3. 

   setrio
   Member

   Tks Andreas!

   I will try to get the sprites with RGBA4444 from the ART team and try to create the PVR again to see what happend.

   Different options didn't get me any difference, because the quality is ok but i get some artifacts in the edges of the sprites.

   Posted 1 year ago #
4. 

   Andreas Loew
   Member

   Try to add shape/sprite padding 1 or 2 pixels should be fine.

   And if possible use the non alpha dithering version of the dithering algorithms.

   If you want you can send me the sprites or a screenshot (I won't show them to anybody) so I can have a look at the artefacts. support at texturepacker.com

   Posted 1 year ago #

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