Ah, finally! Figured out what was going on... The plane was an XZ plane, not XY. Changed the following line:
p.fromNormalAndPoint(new Number3D(0, 1, 0),new Number3D(0, 0, 0)); to p.fromNormalAndPoint(new Number3D(0, 0, 1),new Number3D(0, 0, 0)); So that the normal now goes through the z access... On Jun 15, 4:21 pm, JeffH <[email protected]> wrote: > I end up with var intersect like: > intersect: x:-244.96517085811377 y:0 z:-492.95774647887356 > > If I set _3dObj.z = 0 then it just moves the object in the x axis. Or > did you mean set the z to zero somewhere else? > > The code below actually has a small error (_3dObj.z = intersect.y;) > instead of (_3dObj.y = intersect.y;) but since intersect.y=0 it didn't > affect anything. Not sure why intersect.y is zero though... > > On Jun 15, 3:58 pm, Michael Iv <[email protected]> wrote: > > > > > set z value to zero , I think only then you will get exact view screen > > coords. the problem is that when your 3d objects are in a distance from the > > camera their position is indeed as you define it after unprojection 2d > > coords. But because frustrum volume has a depth and because of perspective > > projection the object 3d position relative to the screen changes.So you need > > to compensate it . > > > On Tue, Jun 15, 2010 at 10:50 PM, JeffH <[email protected]> wrote: > > > Just tried using a perspective lens... Seems to work better. Although > > > I can't explain why the y value needs to be negative in order to move > > > it up. I thought a (10,10) position on the screen would require (-220, > > > 140) for a screen and view size of 460x320. If I put in the following > > > coordinates the object ends up near the 10,10 stage position: > > > > var ray:Number3D = view.camera.unproject(-220, -140); > > > var cameraPosition:Number3D = new Number3D(view.camera.x, > > > view.camera.y, view.camera.z); > > > ray.add(ray, cameraPosition); > > > var p:Plane3D = new Plane3D(); > > > p.fromNormalAndPoint(new Number3D(0, 1, 0),new Number3D(0, 0, 0)); > > > var intersect:Number3D = p.getIntersectionLineNumbers(cameraPosition, > > > ray); > > > _3dObj.x = intersect.x; > > > _3dObj.z = intersect.y; > > > _3dObj.z = intersect.z; > > > view.render(); > > > > On Jun 15, 3:10 pm, Michael Iv <[email protected]> wrote: > > > > Tried perspective lens with default zoom?? > > > > > On Tue, Jun 15, 2010 at 10:07 PM, JeffH <[email protected]> wrote: > > > > > So I tried unsuccessfully using unproject like this: > > > > > > Since _2dObj.x = 10; _2dObj.y = 10: > > > > > var scenepos:Number3D = view.camera.unproject(10,10); // a point 10 > > > > > pixels off the top left corner of the stage > > > > > _3dObj.moveTo(scenepos.x,scenepos.y,scenepos.z); > > > > > > This gives me the following approximate values (and so didn't move the > > > > > 3D object to the upper left): > > > > > scenepos.x = 0.2 , scenepos.y = 55 , scenepos.z = 82 > > > > > > Is it something to do with my camera settings?: > > > > > > view.camera = new HoverCamera3D({zoom:50}); > > > > > view.camera.lens = new OrthogonalLens(); > > > > > view.camera.position = new Number3D(0, -675, -1000); > > > > > view.camera.lookAt(new Number3D(0, 0, 0)); > > > > > > On Jun 15, 2:21 pm, Michael Iv <[email protected]> wrote: > > > > > > I don't have a code for this exact scenario but you can doit this > > > way: > > > > > > Create a dummy object , any kind of sprite (can be invisible if you > > > need) > > > > > or > > > > > > even generic Point class of flash.Get it to the position of view > > > where > > > > > you > > > > > > want your 3d object to move in 2d . Unproject the 2d coordinates > > > > > > into > > > 3d > > > > > > space using camera.unproject() . This method returns Number3d that > > > > > > is > > > > > > scene3d position of your object Then tween your 3d object to that > > > > > position. > > > > > > I think that should work for you. > > > > > > :) > > > > > > > On Tue, Jun 15, 2010 at 8:09 PM, JeffH <[email protected]> wrote: > > > > > > > Hi Michael, > > > > > > > > I really appreciate your help on this. Unfortunately, I feel like > > > I'm > > > > > > > flying blind. The docs don't indicate what unproject does so I'm > > > > > > > unclear how to proceed. What would be really helpful is if you > > > could > > > > > > > post some code that would accomplish the following: > > > > > > > > Given a stage size of 480x320 and a view that is similar in size > > > but > > > > > > > centered, move a 3d object from position 0,0,0 to the stage > > > position > > > > > > > 0,0. That is, move the 3D object from the center of the stage to > > > the > > > > > > > top left corner. If you could show me how unproject works with > > > > > > > this > > > > > > > example, that would be great! > > > > > > > > Thanks again. > > > > > > > > On Jun 15, 12:32 pm, Michael Iv <[email protected]> wrote: > > > > > > > > Do unproject ! > > > > > > > > > Sent from my iPhone > > > > > > > > > On Jun 15, 2010, at 7:08 PM, JeffH <[email protected]> wrote: > > > > > > > > > > I'm looking for: > > > > > > > > > > screenPlace(view.camera, 2Dobject, 3Dobject) > > > > > > > > > > function screenPlace(camera,obj2D,obj3D):void { > > > > > > > > > some code > > > > > > > > > obj3D.x = something > > > > > > > > > obj3D.y = something > > > > > > > > > } > > > > > > > > > > Given a 3d object and a 2d location (from the stage), move my > > > 3D > > > > > > > > > object so that it sits on the 2d object's screen position. > > > > > > > > > > On Jun 15, 11:40 am, Michael Iv <[email protected]> wrote: > > > > > > > > >> yes it does , isn't it what you need? > > > > > > > > > >> On Tue, Jun 15, 2010 at 5:36 PM, JeffH <[email protected]> > > > wrote: > > > > > > > > >>> Sorry, I meant "But isn't this is returning the 3D coords > > > > > > > > >>> for > > > a > > > > > 2D > > > > > > > > >>> point based on a 3D > > > > > > > > >>> objects position?" > > > > > > > > > >>> On Jun 15, 10:35 am, JeffH <[email protected]> wrote: > > > > > > > > >>>> But isn't this is returning the 3D coords for a 3D point > > > based > > > > > on > > > > > > > > >>>> a 3D > > > > > > > > >>>> objects position? I think I need to do the opposite. Move a > > > 3D > > > > > > > > >>>> object > > > > > > > > >>>> (its z=0 btw) to a 2D point based on an object on the > > > > > > > > >>>> stage. > > > > > > > > >>>> Example, > > > > > > > > >>>> move my 3D boat to a marker on a river where the marker is > > > > > > > > >>>> a > > > 2D > > > > > > > > >>>> flash > > > > > > > > >>>> object on the stage. > > > > > > > > > >>>> On Jun 15, 10:24 am, Michael Iv <[email protected]> > > > wrote: > > > > > > > > > >>>>> You are almost correct but you have got to give an offset > > > to > > > > > the > > > > > > > > >>> coordiantes > > > > > > > > >>>>> as view coord system is different from Scene3D > > > > > > > > > >>>>> _spriteX=_screenVertex.x+_view.width*.5; > > > > > > > > >>>>> _spriteY=_screenVertex.y + _view.height*.5; > > > > > > > > > >>>>> On Tue, Jun 15, 2010 at 5:10 PM, JeffH <[email protected]> > > > > > wrote: > > > > > > > > >>>>>> Hi Michael, > > > > > > > > > >>>>>> I'm probably just missing something really easy here but > > > I've > > > > > > > > >>>>>> seen > > > > > > > > >>> the > > > > > > > > >>>>>> following example code which just seems to be for moving > > > > > > > > >>>>>> a > > > 2D > > > > > > > > >>>>>> object > > > > > > > > >>>>>> to a point in the 3D space. Can you show me an example of > > > how > > > > > I > > > > > > > > >>>>>> would > > > > > > > > >>>>>> move a 3D object based on a 2D point? Thanks for your > > > help! > > > > > > > > > >>>>>> screenPlace(view.camera, myMovieClip, 3Dobject) > > > > > > > > > >>>>>> function screenPlace(camera,who,whob):void { > > > > > > > > >>>>>> var sc:ScreenVertex; > > > > > > > > >>>>>> sc = camera.screen(whob) > > > > > > > > >>>>>> who.x = sc.x + view.x; > > > > > > > > >>>>>> who.y = sc.y + view.y; > > > > > > > > >>>>>> } > > > > > > > > > >>>>>> On Jun 15, 9:36 am, Michael Iv <[email protected]> > > > wrote: > > > > > > > > >>>>>>> use ScreenVertex coordinates by accessing > > > > > > > > >>>>>>> camera.screen() > > > > > > > > >>>>>>> method . > > > > > > > > >>>>>>> :) > > > > > > > > > >>>>>>> On Tue, Jun 15, 2010 at 4:34 PM, JeffH < > > > [email protected]> > > > > > > > > >>>>>>> wrote: > > > > > > > > >>>>>>>> Hi all. I wanted to get the experts' opinions on the > > > best > > > > > way > > > > > > > > >>>>>>>> to > > > > > > > > >>>>>>>> accomplish what I need to do. I have a 3D object (a > > > boat) > > > > > > > > >>>>>>>> that is > > > > > > > > >>> in a > > > > > > > > >>>>>>>> view with the camera set to a position and roll (45) to > > > try > > > > > and > > > > > > > > >>>>>>>> achieve a "simcity" look. The settings are like this: > > > > > > > > > >>>>>>>> view.camera.x = 675; view.camera.y = -675; > > > > > > > > >>>>>>>> view.camera.z > > > = > > > > > > > > >>>>>>>> -1300; > > > > > > > > >>>>>>>> view.camera.roll(45); view.camera.lookAt(new > > > > > > > > >>>>>>>> Number3D(0, > > > 0, > > > > > > > > >>>>>>>> 0)); > > > > > > > > > >>>>>>>> What I want to do is to move this object based on 2D > > > points > > > > > > > > >>> located on > > > > > > > > >>>>>>>> the stage (for example, a path along a river). What is > > > the > > > > > best > > > > > > > > >>> way to > > > > > > > > >>>>>>>> do this? I did try converting 2D points to 3D by trying > > > to > > > > > get > > > > > > > > >>> the > > > > > > > > >>>>>>>> intersect of a ray off a plane but it doesn't seem to > > > work. > > > > > Not > > > > > > > > >>> sure > > > > > > > > >>>>>>>> if it is because I have a camera roll... I tried this > > > based > > > > > on > > > > > > > > >>> some > > > > > > > > >>>>>>>> other posts (where my 2D point is the var pt): > > > > > > > > > >>>>>>>> var plane:Plane3D = new Plane3D(); > > > > > > > > >>>>>>>> plane.fromNormalAndPoint(new Number3D(0, 1, 0), new > > > > > Number3D(0, > > > > > > > > >>> 0, > > > > > > > > >>>>>>>> 0)); > > > > > > > > >>>>>>>> var cameraPosition:Number3D = new > > > Number3D(view.camera.x, > > > > > > > > >>>>>>>> view.camera.y, view.camera.z); > > > > > > > > >>>>>>>> var ray:Number3D = view.camera.unproject(pt.x, pt.y); > > > > > > > > >>>>>>>> ray.add(ray, cameraPosition); > > > > > > > > >>>>>>>> var intersect:Number3D = > > > > > > > > >>>>>>>> plane.getIntersectionLineNumbers(cameraPosition, ray); > > > > > > > > > >>>>>>>> But, intersect.x does not seem to align with pt.x on > > > > > > > > >>>>>>>> the > > > > > > > > >>>>>>>> screen. > > > > > > > > >>>>>>>> Perhaps I am misinterpreting how this should work? > > > Should I > > > > > try > > > > > > > > >>> to > > ... > > read more »
