[away3d] Re: getting vertices of imported .obj and hiding several .obj ?

Fri, 24 Apr 2009 05:38:48 -0700 


your loader "obj1" might not be declared...
Also make sure it's a Mesh instance when you do not have the error anymore.. 
trace(obj1.handle is Mesh);
if not you'll get another error. If the handle is indeed a single Mesh object exported as obj and there is no g tag in the file, then the code will run ok. 

Fabrice

On Apr 24, 2009, at 11:49 AM, jojo wrote:



Thanks for the response, Fabrice :)

obj1.visible=false; ... Ah very good and should have been obvious to
me ... I feel a bit silly ...
tried it but didn't work but I think that is because button isn't
working ... I'll get it working

All single meshes for now ... so I tried:

private var obj13d:Object3D;

obj1 = Obj.load("assett/teapot_1.obj", { material:material } );

obj1.addOnSuccess(onLoaderSuccess);


private function onLoaderSuccess(e:LoaderEvent):void
{

var mesh:Mesh = obj1.handle as Mesh;
trace(mesh.vertices.length);
}

but got compile "output":
TypeError: Error #1009: Cannot access a property or method of a null
object reference.
        at Basic_Cube/onLoaderSuccess()
        at flash.events::EventDispatcher/dispatchEventFunction()
        at flash.events::EventDispatcher/dispatchEvent()
        at away3d.loaders::Object3DLoader/notifySuccess()
        at away3d.loaders::Object3DLoader/onParserComplete()
        at flash.events::EventDispatcher/dispatchEventFunction()
        at flash.events::EventDispatcher/dispatchEvent()
        at away3d.loaders::AbstractParser/notifySuccess()
        at away3d.loaders::AbstractParser/parseNext()
        at away3d.loaders::Object3DLoader/startParsingGeometry()
        at away3d.loaders::Object3DLoader/onGeometryComplete()
        at flash.events::EventDispatcher/dispatchEventFunction()
        at flash.events::EventDispatcher/dispatchEvent()
        at flash.net::URLLoader/onComplete()

Do I have obj13d as the mesh or is that output saying something else?

Sorry for all the low level questions ... btw I'm excited to be
"trying" to learn away3d because I've read so many things about it.
Good job!

On Apr 24, 12:35 am, Fabrice <[email protected]> wrote:

Hi Jojo,
You need to save the Object3DLoader.handle object instead of the
Object3DLoader itself.

the handle is the loaded geometry as Object3D
for the obj format this means it can be an ObjectContainer3D, most of
the time because you grouped meshes into your editor, (G tag into the
obj file)
Mesh(es) or both. So you need to parse the handle according to your 3D 
object (obj file).

for instance on onLoaderSuccess
the obj1.handle Object3D can be a Mesh or an ObjectContainer3D

If the obj file contains just a single mesh, you can access the
geometry information like this:
function addOnSuccessresult
        var mesh:Mesh = obj1.handle as Mesh;
        trace(mesh.vertices.length);
        mesh.material = somenewMaterial;

while if the obj file is a group of meshes the above code would
generate an error, since the handle is not a Mesh but an
ObjectContainer3D
trace("there are "+obj1.handle.children.length+" objects in this 
file");
var mesh:Mesh = (obj1.handle as ObjectContainer3D).children[0]; 

If you have variable structure and you want to automate, just add a
recursive parsing on loaded success,
Take a look in Weld class, Mirror class code to see how its done.

hiding an object is as simple as adding the property visible true/
false to it.
when set to false, the object is ignored by the engine for the
rendering.

Welcome to Away!

Fabrice

On Apr 24, 2009, at 6:26 AM, jojo wrote:






Hello,



I'm new to oop, flash, and away3d but trying hard reading
examples,etc ... just can't get mind around certain concepts ...



Couple questions ...



Suppose I read in an exported .obj file (textures come in fine) as
such:



import away3d.loaders.Obj;



public var obj1:Object3DLoader;



var material:BitmapFileMaterial = new BitmapFileMaterial
("bitmap1.jpg");



obj1 = Obj.load("teepot1.obj", { material:material } );



All good to that point ...
1. How do I get access to mesh vertices to be able to manipulate obj1? 
I know it's mesh.vertices but all examples I've seen just don't make
sense (not sure the basic setup). Could I get a little extra
clarification as to where to begin having obj1 in hand?
2. If I then read in another obj file (which I verified can be read in and texture file is ok) how do I switch back and forth displaying one 
or the other?



I've tried:



if (objtoload=2) { scene.addChild(obj2);scene.removeChild(obj1); }



via a button handler but I get the original obj and then a cube of
some sort with a texture of text saying "Loading Geometry ..." over
top of original obj ...



using Flash CS4 (demo), away3D 3.3.3, btw



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