private function rotateMeshY90(object3d:Object3D, angle:Number=
90):void
{
if (object3d is ObjectContainer3D)
{
trace("no mesh");
var obj:ObjectContainer3D = (object3d as
ObjectContainer3D);
for (var i:int = 0; i < obj.children.length;
i++)
{
if (obj.children[i] is
ObjectContainer3D)
{
trace("no mesh");
rotateMeshY90(obj.children[i]);
}
else
{
(obj.children[i] as
Mesh).rotationY = angle;
(obj.children[i] as
Mesh).applyRotations();
}
}
}
else
{
trace("found some mesh!");
(obj.children[i] as Mesh).rotationY = angle;
(obj.children[i] as Mesh).applyRotations();
}
}
Ok, i tried this... didn't seem to change the rotational property at
all... however i was able to fix the 'sideways' problem by reexporting
a reoriented (perpendicular) angle.
Do you think if i saved the ObjectContainer3D from Collada to AS3 i
would be able to use the class as a mesh?
On Nov 29, 1:49 pm, Fabrice <[EMAIL PROTECTED]> wrote:
> thats because its not a mesh, but an Object3d of type ObjectContainer3D.
> The error is generated because the ObjectContainer do not have
> vertexes and no geometry property. One of the two triggers that error.
> Its a Mesh class method.
>
> If the first child is indeed of type Mesh...
>
> try:
> this.Model.children[0].rotationY = 90;
> this.Model.children[0].applyRotations();
>
> if you need to automate, look at Mirror class or ObjExporter loop...
> There are similar codes in there....
>
> Fabrice
>
> On Nov 29, 2008, at 6:22 PM, cellis wrote:
>
>
>
> > Ok it appears to be working that way, however i am not able to say
> > (Model as Mesh).applyRotations(); ... it throws an null reference
> > error because (Model as Mesh) returns null:
>
> > private function onLoaderSuccess(event:LoaderEvent):void
> > {
>
> > this.Model = event.loader.handle as ObjectContainer3D;
> > this.Model.rotationY = 90;
> > (this.Model as Mesh).applyRotations();
> > trace(this.Model.rotationY);
> > initAnimations();
>
> > }
>
> > is there a reason for this? I also tried it in the enterFrame event ,
> > with the same result.
>
> > On Nov 29, 10:46 am, Fabrice <[EMAIL PROTECTED]> wrote:
> >> well, thats because you say to lookat but pass a null targetobject
> >> and
> >> you say to the PathAnimator to set the aligntopath to true.
> >> so by default the class asumes you just want to move an item along
> >> the
> >> path without altering its orientation.
> >> because you can't look at something and align to path at the same
> >> time.
>
> >>http://away3d.com/tutorials/tutorial-how-to-use-the-pathanimator-
> >> class
> >> take a closer look at the examples at the end of the tut.
>
> >> Fabrice
>
> >> On Nov 29, 2008, at 3:48 PM, cellis wrote:
>
> >>> Hey fabrice,
>
> >>> I have an example uploaded of what i'm trying to do.
>
> >>>http://away3d-dev.googlegroups.com/web/Applied3DGameProject.zip?gda=p
> >>> ...
>
> >>> feel free to edit the points as you like. Basically the dog (thanks
> >>> Katopz!) doesn't point in the direction of motion.
>
> >>> Do you see what i mean now?
>
> >>> On Nov 22, 5:33 am, Fabrice <[EMAIL PROTECTED]> wrote:
> >>>> I understand you want the car ispathdriven but I'm not sure I
> >>>> have a
> >>>> clear picture of what you want the car be able to do.
> >>>> There are tons of options, but here a few directions that might
> >>>> help
> >>>> you.
>
> >>>> Say you want it stays free, yet within the bounderies of the road,
> >>>> witch is defined by thepath.
>
> >>>> 1/ to use a container or a dummy object. they are driven by
> >>>> thepath.
> >>>> in container case, the car would be in it.
> >>>> 2/ just define a distance. then when you move the car just check
> >>>> the
> >>>> distance from the car to the dummy or container position.
>
> >>>> this allows you to check direction, like for instance "you're going
> >>>> wrong way", you just need to compare pathanimator.time with actual
> >>>> time.
> >>>> the increase the time, just make your acceleration angular, based
> >>>> on
> >>>> the rotations of the object into the container. since the container
> >>>> is pathdriven with an align topath,
> >>>> the direction vector is equal to the rotations props of the
> >>>> container.
>
> >>>> you can also, if your road is not pathextruded, just ask positions
> >>>> based on time and apply the result to your object.
> >>>> getPositionOnPath( p:Number3D, t:Number). But here you miss indeed
> >>>> the
> >>>> directional vector. I will add a getter for the directional vector.
> >>>> It
> >>>> will return the last generated one of the animated object.
> >>>> if you want to do it yourself just save the vector in the
> >>>> orientateAt
> >>>> handler.
>
> >>>> Say now that you want car to follow a randompath. define just 3
> >>>> segments.
> >>>> add a segmentListener.
> >>>> on event, just calculate a radius from actual object position, set
> >>>> first segment end to a random angle based on that radius.
> >>>> then push(shift) thepathinfo, smoothpath. If done right, thepath
> >>>> should "scroll" itself under the car.
>
> >>>> if the car just drives arround and you want to save power by not
> >>>> recalculating a new segment each event, just pop shift thepathinfo,
> >>>> and give a longerpathdefinition with enough variation.
>
> >>>> Hope it helps a bit.
>
> >>>> Fabrice
>
> >>>> On Nov 22, 2008, at 9:38 AM, cellis wrote:
>
> >>>>> ok it is starting to make some sense now...
>
> >>>>> in regards to thepathanimation and rotations... perhaps this will
> >>>>> clarify what i am trying to do
>
> >>>>> 1. generate a randompathfor the car to follow ... this is simple,
> >>>>> just a series of Number3D points (for instance a road)
> >>>>> 2. pass generatedpathto pathanimation
>
> >>>>> so i cannot do the rotations by hand ... these need to be setup
> >>>>> dynamically on the fly and then passed to the rotations.
>
> >>>>> then, if the series define a curve (not a straight line), i need
> >>>>> to
> >>>>> calculate direction using either Atan2(), Catmull - Rom (splines),
> >>>>> or
> >>>>> something else (i'm open to suggestions, these are just what books
> >>>>> and
> >>>>> other people have been telling me). For instance...this from
> >>>>> another
> >>>>> forum--
>
> >>>>> -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
> >>>>> "In general terms, the direction the car is pointing is along its
> >>>>> velocity vector, which is the first derivative of its position
> >>>>> vector.
>
> >>>>> For example, if the car is going in a circle (of radius r) around
> >>>>> the
> >>>>> origin every n seconds then the x component of the car's
> >>>>> position is
> >>>>> given by:
>
> >>>>> x = r.sin(2πt/n)
>
> >>>>> and the x component of its velocity vector will be:
>
> >>>>> vx = dx/dt = r.(2π/n)cos(2πt/n)
>
> >>>>> Do this for all of the x, y and z components, normalize the
> >>>>> resulting
> >>>>> vector and you have your direction."
> >>>>> --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
>
> >>>>> ^^ Do you have some insight has to how that formula can be applied
> >>>>> with apathanimator, or should i set up a custom tween/animation?
>
> >>>>> On Nov 16, 1:37 pm, Fabrice <[EMAIL PROTECTED]> wrote:
> >>>>>> The rotations property is an array of number3D's, each one is the
> >>>>>> representation of the rotation for the animated object along
> >>>>>> thepath
> >>>>>> at the start of a CurveSegment.
> >>>>>> but since you use the align topath, you have only one axis
> >>>>>> free. 2
> >>>>>> others being used by the code.
>
> >>>>>> so say you have 2 curveSegments defined and want your object
> >>>>>> align on
> >>>>>> pathand having a rotation arround thepathdirection.
> >>>>>> rotations property would be for instance
>
> >>>>>> var a:Array = [new Number3D(20, 0,0), new Number3D(-20, 0,0), new
> >>>>>> Number3D(0, 0,0) ];
> >>>>>> rotations = a;
>
> >>>>>> so your object will start align topathwith a 20, in middel at -20
> >>>>>> and will exit thepathwith ) rotation.
>
> >>>>>> The reason it might look like its a Z rotation while its a X
> >>>>>> one, is
> >>>>>> the direct result of the way you define yourpath.
> >>>>>> Onepathgoing in z would be affected another way than apathdefine
> >>>>>> along the x axis.
> >>>>>> That's why thePathhas a WorldAxis property.
>
> >>>>>> to rotate your model if its sidewards, use first
> >>>>>> model.rotationY = 90;
> >>>>>> (model as Mesh).applyRotations();
>
> >>>>>> now its pointing on thepathusing the pathanimator. And it has
> >>>>>> nothing to do with the rotations applied while its animated.
> >>>>>> Its a rotation at mesh level.
>
> >>>>>> also not that in some cases, changing of world quadrants can also
> >>>>>> influence the behavior. To avoid those, just be sure yourpath
> >>>>>> definition gets an offset big enough
> >>>>>> to stay within one quadrant. mmm I stop now, don't want to
> >>>>>> confuse
> >>>>>> you :)
>
> >>>>>> Fabrice
>
> >>>>>> On Nov 16, 2008, at 5:43 PM, cellis wrote:
>
> >>>>>>> Hey fabrice,
>
> >>>>>>> i tried passing
>
> >>>>>>> rotations:[90,90,90]; //to thepathData, but i'm not sure it
> >>>>>>> worked...
>
> >>>>>>> i'm not quite sure of the syntax to use here: should it be an
> >>>>>>> anonymous object?
>
> >>>>>>> could you please post an example of apathdata object declared?
> >>>>>>> here
> >>>>>>> is mine
>
> >>>>>>> var animInit:Object =
> >>>>>>> {
> >>>>>>> duration:5000,
> >>>>>>> lookat:false,
> >>>>>>> aligntopath:true,
> >>>>>>> targetobject:null,
> >>>>>>> offset:new Number3D(0, 100, 0),
> >>>>>>> rotations:[90,90,90],
> >>>>>>> fps:30,
> >>>>>>> easein:false,
> >>>>>>> easeout:false
> >>>>>>> }
>
> >>>>>>> Again, thanks alot!
>
> >>>>>>> On Nov 15, 11:16 am, Fabrice <[EMAIL PROTECTED]> wrote:
> >>>>>>>> Sure you can,
>
> >>>>>>>> just say
> >>>>>>>> object.rotationY = 90; //--> or whatever is needed
> >>>>>>>> then
> >>>>>>>> (object as Mesh).applyRotations();//rotates internally the mesh
> >>>>>>>> geometry
> >>>>>>>> //--> rotationY is now back to zero if you trace, while your
> >>>>>>>> mesh
> >>>>>>>> is
> >>>>>>>> remains rotated on the Y axis
>
> >>>>>>>> the rotations property on the PathAnimator are there to allow
> >>>>>>>> to
> >>>>>>>> have
> >>>>>>>> rotations along thepath.
> >>>>>>>> say you have an aircraft, you define apaththat goes from air to
> >>>>>>>> ground where you want it crash.
> >>>>>>>> when align topathprop is set the aircraft would point at
> >>>>>>>> thepath
> >>>>>>>> direction.
> >>>>>>>> but if you want the aircraft has also some roll influence while
> >>>>>>>> following thepath, just pass a rotations array, a series of
> >>>>>>>> Number3d,
> >>>>>>>> acting per CurveSegments
>
> ...
>
> read more »
