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Posts Tagged ‘PV3D’

Flash AS3: A quick test of Five3D

May 21st, 2010

Five3D is a compact Actionscript library that allows you to create 3D views quickly and easily. Much like Papervision3D, Away3D or Sandy, it allows you to create basic 3D graphics with Actionscript. Why would you use Five3D instead of one of these other libraries? Here’s a quick rundown of the advantages and shortcomings of Five3D  that I have found:

  • Five3D has a stripped-down feature set. If you need to do something simple like move a large number of planes in 3D space, Five3D will be easier to set up than the other 3D packages. The drawback is that it doesn’t do many of the things that the other engines do, like providing built-in primitives or Collada imports.
  • Five3D handles vector objects without first turning them into bitmaps. You can actually use Flash’s native drawing API to create vector shapes and move them in 3D while still retaining the vectors. This creates smoother renders than the other 3D engines, especially when scaling and rotating objects. The other 3D engines create bitmaps of textures and then map them onto the surfaces of objects.
  • Five3D handles 3D text really well. You can convert fonts into vectors and then use them as 3D objects. This makes 3D text effects really simple.
  • The default handling of bitmap textures is cleaner than Papervision. With Five3D, bitmap textures on planes map much more smoothly than with Papervision’s defaults. You can map textures just as well in Papervision, but it’s a little bit of a hassle to set up.
  • The Five3D library is written to extend the native flash classes in a way that is really intuitive. For example, a MovieClip3D is just like a MovieClip, but it has additional features like a z-coordinate. Half the time, you can guess what properties each object will have without even looking them up in the docs.
  • Five3D doesn’t use a camera object. Depending on your needs, this could be an advantage or a disadvantage. You can handle this by simply creating a Sprite3D container to hold all of your objects. Then, move the container to simulate camera movement. I often do this in Papervision projects anyway because of various issues I have had with the camera.

I have built a simple “Hello World” test of Five3D, which you can see below. It’s not very exciting, but it isn’t supposed to be. When I started playing with Five3D, I had a hard time finding a simple, stripped-down example that could get me started, so that is what I’ve built here. You can download the source files here. I have also added links to some more advanced tutorials and samples at the bottom of this post.

I did run into some weird Five3D quirks when I built this. First, when I created a MovieClip3D object and added it to the scene, it wasn't appearing on stage. I traced all of the properties and everything indicated that it was on the stage, but it was not displaying. I Googled around a bit and found this website with the answer: you have to call the activate() function for MovieClip3D objects to get them to render on the stage. I don't understand why you need to do this, but it fixed my problem.

The other quirk that you need to know about is that you have to turn on z-sorting. By default, it z-sorts according to your addChild() calls, just like regular MovieClips. If you don't need z-sorting, just add the 3D items in the correct sequence. I'm guessing that this helps to optimize the code. If you need your objects to spin in 3D space, you can turn on z-sorting with the childrenSorted property (check out the example source code for usage).

Thanks to Mathieu Badimon for this amazing Actionscript package.

Links:

Download the source files for the example above

A 3D text sample with source code

A simple example of Five3D with source code

A fun Five3D experiment

A tutorial on building a 3D photo album with Five3D

Info on integrating Five3D with Jiglib physics

Papervision3D: Max3DS vs. Collada performance

July 13th, 2009

Papervision3D is an incredible open-source library for building 3D applications in Flash. You can create basic 3D objects and animate them with Actionscript, but if you really want to create something cool, you need to import a 3D model made with a program like 3D Studio Max, Maya, or Blender.

Several different 3D file formats can be imported into Papervision – the most popular format seems to be Collada (*.DAE), which is an XML format. However, I recently noticed that *.3DS files could also be imported to Papervision using the Max3DS class. 3DS is an old file format for 3D Studio Max, but many 3D programs will still export this format. Since it is a binary format, it creates much smaller files than Collada, which can significantly decrease model load times, but I was curious if there was any noticeable performance difference once the models were imported. In theory, the models should perform identically once they are imported.  So I created a test to see if this was true.

I created a quick model of a 57 Chevy station wagon in 3D Studio Max 9 for my test. The finished model has 1833 vertices and 1802 faces. Please note that I’m a noob when it comes to 3D modeling and I know that this model has some issues, but I really only cared that it imported correctly to PV3D. Anyway, I exported the model to both Collada and 3DS formats. The exported file stats are:

wagon5.3DS = 103 KB
wagon5.DAE = 488 KB

I then created 2 Flash files that are identical except for the type of model that is imported for rendering. Click one of the images below to view the results in Papervision.

papervision_collada_test papervision_max3ds_test

 

As you can see, they look essentially identical. Each SWF loads the model 5 times and renders it to the screen with a FlatShadeMaterial. How did they perform? Well, that depends…

When I first created these SWFs, I tested them on my work computer. It’s a pretty fast Dell desktop PC with lots of RAM running Windows Vista and Flash Player 10. The 3DS format performed noticeably better on my work machine. The frame rates were similar for both models, but the memory usage was much lower than the Collada format. The 3DS model rotation also looked smoother than the Collada model and the 3DS file had much quicker file load time. It looked like a clear winner.

Then I spent some time cleaning up the files on my laptop at home and the performance tests didn’t show the same results. My laptop is a Lenovo PC that isn’t as fast as my work computer and I run Windows XP with Flash Player 9. While testing at home, the 3DS file still had lower memory usage and the animations both looked the same. The frame rate difference was still marginal.

So, which one performs better? It may be  dependent on the machine, the operating system, and the version of Flash you are running. I still give the 3DS format the advantage for it’s lower file size and memory usage. It may be a good idea to build a toggle into your Papervision project that allows you to import either format and do a lot of testing as you go before deciding on one format or the other. As always, keep your target audience (and their computers) in mind.

Feel free to use the Flash and Actionscript files to run your own tests or simply steal the code for your project. The methods that I used for loading and initializing the models may save you some time and frustration when dealing with the quirks of both the Collada and Max3DS parsers in Papervision. For example, the Max3DS parser would not allow me to initialize the model with a FlatShadeMaterial, so I had to use a ColorMaterial. But, once it was loaded, it would allow me to replace the ColorMaterial with a FlatShadeMaterial.

Please do not use the 3D model I have provided for production work. I have provided the model for you to use in these experiments, but it is copyrighted and I would really appreciate you not using it for anything else.

As always, you can download the source files here.

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