Actionscript 3 :: Calculate An Objects Scale Using A Perspective Projection Matrix?
May 31, 2011
Im currently building a little 3D particle engine in flash the uses sprites.to set the position of each sprite I am using the projectVector function below. (the viewTransform matrix is the particles world matrix concatenated with a perspective projection matrix)
var projectedPoint:Vector3D = Utils3D.projectVector(viewTransform, point);
sprite.x = projectedPoint.x;
sprite.y = projectedPoint.y;
[code].....
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May 2, 2010
The following is entirely a math question. As we know, PerspectiveProjection delivers perspective transformations in 3D represented by the interdependent values of fieldOfView and focalLength according to the following formula:
focalLength = stageWidth/2 * (cos(fieldOfView/2) / sin(fieldOfView/2)
Q: How to get the visible on-screen size of the DisplayObject (Cube on the above-linked image) to which PerspectiveProjection has been applied? A more thorough description and illustrative code on the issue in ActionScript 3 lacks functionality for visible bounds of DisplayObject.
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Jan 24, 2012
url...The interesting part is that he didn't use perspectiveFieldOfViewLH and instead he defined his own projection matrix. I'm new to the 3d programming, so after reading this explenation of projection matrix:[code]And i got the black screen. All i did was exchanging the matrix from the tutorial with this matrix. I tried to play with it for some time, but with no results. This is the matrix from the tutorial[code]
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Jan 16, 2012
I'm basically trying to emulate Photoshop's Vanishing Point tool where you can define the 4 2D points and the 3D plane is calculated from that information, in terms of the rotation of the plane relative to x y and z axes.
So if you have an image like this one:
And you define the points of the four corners, maybe like this:
It would define the 3D plane that the surface must live on relative to the x y and z axes. Researching this has led me to some tutorials on drawTriangles and Homographies, but they all seem to be focused on mapping bitmap data and I can't seem to find anything that defines a 3D plane itself.
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Mar 27, 2011
How to convert 3d point to 2d point? I've found next formula in Internet(camera is situated in origin)
[Code]....
But these formulae give me strange result when z are less than zero(z<0) I need build line from A(100,100,100) to B (100,100;-100) As you can see these equations give really strange result when I try to convert B point in 2D dimension
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Mar 14, 2011
Most often, questions are asked about how to scale a DisplayObject, and the answer is usually to use a Matrix.
My question is, how to you GET the scale of a Matrix (scaleX and scaleY)?
There's a Matrix.scale method to set the scaleX and scaleY, but it doesn't return a value, and no other properties exist to read it back.
The reason I ask, I'm using object burried deep down into a Display list, and each may be transformed. So I use the child object's sprite.transform.concatenatedMatrix getter, but am stuck at this point on how to read the scale from it.
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Jul 21, 2009
Unfortunately geometry is not my strong point and I am on a deadline. I am trying to determine if a textfield is larger than a displayObject and that it does not sit outside the x and y of said object. If it is larger, I need to scale it and make sure it is always in the confines of the displayObject space. On a side note, i need to scale the size of the text accordingly.
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Jun 29, 2011
I'm using a transform matrix as part of a bitmap draw to select an area of my target rather than drawing from 0,0:
var bmd:BitmapData = new BitmapData(target.width,target.height,true,0);
var mat:Matrix = new Matrix(1,0,0,1,-target.x,-target.y);
bmd.draw(this,mat);
[code]......
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Feb 4, 2008
how to scale down flash images using BitmapData and Matrix?? I'm using it for fullscreen so that the images are always perfect. I've been tampering with this, but cannot get it to work properly.
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Jun 22, 2011
my problem is that if i scale, rotate or translate a display object using its transform.matrix i am not getting the value in the display object but the transform is happening like displayObject.scaleX or displayObject.scaleY etc. i get this new transform value using the dislayobject? as i am using a matrix transform manager which actually changing the transform matrix of the display object.
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May 15, 2006
imagen I have a movieclip (space_mc) w1000Xh1000 px?
inside the space_mc I have 2 movieclips:
- vlak1_mc (w100xh100px, _x:100,_y:100);
- vlak2_mc (w100xh100px, _x:400,_y:400);
ok!?
now i put the space_mc on the stage and scale it to 20% the stage (document properties) are w800xh600
Now i want that the USER clicks on vlak1,2_mc and the space_mc scales to 100% But the clicked vlak(1,2)_mc must have the exact coordinates as in the space_mc?
so if clicked on the vlak1_mc!
the space_mc zooms in to 100% and the _x,_y of the vlak1_mc are x100,y100 on the stage(800x600)?
[URL]
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Nov 7, 2009
I am working on a project where I need an interactive matrix of 500x500 clickable lements. I thought this would be an easy task in actionscript3 but boy was I wrong. was able to create a matrix where each element was a Sprite object with attached Mouse click event. But here the performance problems begin. FlashPlayer10 can handle up to 100x100 matrix, but when I increase my matrix I start getting script timeout in browser player... Here is how my "unfinished" matrix looks like.
So how should I approach this problem? I was hoping flash will be able to handle so many elements, but I guess I was wrong. I want to have a pan control to pan around for objects off screen and of course zoom in/out control.It's true I'm not very professional in Flahs and actionscript but a friend who is told me this would be no problem implementing in AS3? I need this in flash as the thing needs to be hosted on website (unless there is a better tool for doing something like this...).
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Feb 16, 2011
I have to validate that 1) the end Date is not less than the start Date and 2) the difference between the two UTC Dates is not more than 12 months. To do this, I need a monthDifference function:
public static function monthDifference(start:Date, end:Date):int;
Since partial months can be confusing, this is how month differences are supposed to work:
The month difference between January 1, 2010 and January 31, 2010 is zero (0).
The month difference between January 31, 2010 and February 1, 2010 is one (1).
The month difference between January 1, 2010 and February 28, 2010 is one (1).
The month difference between January 1, 2010 and March 1, 2010 is two (2).
How can I calculate month difference in ActionScript 3.0?
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Apr 5, 2003
Has anyone here ever developed a function (or general library of relevant functions) that will allow one to find the inverse of a matrix? I've searched the forum archives, as well as the internet more generally, but haven't found anything. If anyone has some leads, I hope you'll pass them along.
If I don't hear anything within the next few days, I might try to develop something on my own, but I'd hate to do so if someone has already done the dirty work.
A solution to this problem would be very useful for 3-D work or anyone doing mathematical programming more generally.
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Sep 7, 2010
I have a purple box on the stage. I turned this box into a movie clip with the instance name of "purple." onEnterFrame, I want to increase the wdith of that box. It is currently 11.75px. I want it to ease into 40px. I want this to happen onEnterFrame.
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Jan 19, 2010
I have airplanes that are flying past the screen from a top down view. when the air planes crash, I scale them down to make it appear as if they are falling closer to the ground and farther away from the screen. I have turrets on these crafts as well. they are seperate objects from the air plan. I scale them down as well. The only problem is they dont reposition correctly. they stay in their x and y positions even though they are being scaled it looks as if they are being pulled away from the air plane. is it possible to reposition them correctly based on the size on the object they sit on (i.e. the air planes)
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Oct 19, 2009
I have a CS4 document with many objects, motion paths over multiple layers. I want to scale everything, including the motion paths of each object. I've tried to do this by Clicking 'Edit Multiple Frames', then 'Selecting All Frames' and finally scaling everything via the Transform panel. Everything appears to have been scaled apart from the motion paths. Is there a way to do this?
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Mar 17, 2010
This is unfortunately a quite complex issue to explain, so please don't get discouraged by the wall of text - it's there for a reason. i'm working on a transformation manager for flash, written with Actionscript 3. Users can place objects on the screen, for example a rectangle.
This rectangle can then be selected and transformed: move, scale or rotate. Because flash by default rotates around the top left point of the object, and I want it to rotate around the center, I created a wrapper setup for each display object (eg. a rectangle).
[Code]...
Now, to the question: should I use a different kind of setup, system or structure? Should I maybe use matrixes, if so, how would you keep a static width/height after rotation? Or how do I fix my current wrapper system for scaling after rotation?
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Jan 30, 2008
Would anybody happen to know if there is a way to scale objects accordingly on stage when switching to fullscreen.. It's sort of like when the stage is set to "scale", and all the objects scale accordingly, but I'm trying to scale the objects while having the stage set to "noScale"..
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Jul 1, 2011
I as this working in AS2 and need to update to AS3...shows that AS3 doesn't like sloppy coding. Here's what I need: I pull data from an XML and that works when I put the data into a dynamic text box. However, I can't seem to get the date of birth into a variable. I have some code that calcs age in years but uses a string literal that I thought I could just replace with a variable from my XML...ain't a workin'. Here's the code I have:
ActionScript Code:
import flash.display.*;
import flash.text.*;
import flash.events.*;
[Code]......
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Jan 5, 2010
I have some data (preferably objects, insteads of string) in the flash which I want to store as table format. So that I can query them. It is not datagrid as I do not have to show them. Currently, I am use "xml class" because of the query function. However, "xml class" cannot store objects.
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Jan 29, 2010
I want to build a sort of pulled down projection screen thing using ActionScript.Basically the MC will come down with a picture on it.I have this starting code which doesn't work terribly well because it just moves the screen from top to bottom instantly.
Code:
on (release) {
do {_root.mcScreen._y+=1;
} while (_root.mcScreen._y<200);
}
Essentially I want the screen to smoothly scroll down into place over about half a second.
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Jan 15, 2011
is there any lib or api out to deal with this ? EVEN, if there is any resource , article from another language c++ , c , .. i just didn't have enough time to test lot of ways
If you search interactive floors , or interactive floor projection you can find some companies who provide such a thing
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Mar 18, 2010
i have a following problem with displaying a scaled and moved image. cliffs:
1. create movieclip
2. draw a square inside, with a starting point (top left corner) in (75000, 75000)
3. move the movie clip so that the square is visible on stage. its important that the movieclip for each iteration is the same.we reapeat this procedure, each time doubling the x/y of starting point, and its width and height. each time we also scale down the movie clip (so its two times smaller than the previos one). we position the movie clip.basic math suggest that all squares should appear one over another. this is what i get:zoomed:
Code:
container square2 x/y: (-47900,-47900)| zoom: 2| w/h: 500| 64%| x/y: (75000,75000)| stage x/y: (99.95,99.95)| stage w/h: 320
container square3 x/y: (-47900,-47900)| zoom: 3| w/h: 1000| 32%| x/y: (150000,150000)| stage x/y: (98.8,98.8)| stage w/h: 320[code]....
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Apr 28, 2005
I am creating a standalone projector (CD with autorun). This means my swf files are NOT contained within html. I would like to, when clicking on button, open a popup html page with specific dimensions. I was wondering if it is possible to do that, and what AS to use,
or if I have the obligation, to openpopups, to launch my swf files within html mother page.
Here is the code of button that works (but does not open popup):
on (press) {
getURL("URL", "_blank");
}
Here is the code for popup but does not work (opens html page normally):
on (press) {
getURL("URL", "", "width=580,height=400,left=100,top=100");
}
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Jun 7, 2010
I have a machine that shoots canon balls into three different barrels, each on a different x axis, I need to be able to shoot at an arc into the target barrel, the target barrel will be randomly determined right before the ball is fired, the barrels will be randomly placed from stage to stage
the friction and gravity applied are constant variables, how can i determine both the correct x and y veleocity to shoot the balls out so that they end up in the correct barrel. I don't want to hard code any variables
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Mar 8, 2007
Scenario: main moveiclip with 4 other clips in it. I want the rolledover clip to scale up and all the others to scale down and blur.
Question: What is the most effiecent way to code this. Would it be a "for in loop"? I am trying to minimize the code and would rather not use a whole bunch of if then statements.
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Feb 19, 2010
I want my flash content to scale when I scale my browser window.
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Jan 14, 2006
How can I convert the current scale of the instance to 100% so I can easily "visualize" and manage the instance when I modify its scale? Here's the actionscript, it works, but I just want the temp._xscale and temp._yscale to be in percentages, not real numbers.
Code:
USflag.onMouseDown = function ()
{
var temp = USflag;
onEnterFrame = function ()
[code]....
One last thing, what's the tag you have to put that is designed for boxing actionscripts? I'm suing [ code ][ /code ]
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Mar 8, 2009
navigation center left, the grey boxes.click it and the content area will flip 180.how is it possible to do such FX?is there any general methods to use perspective in flash?
- with bitmaps
- with MCs
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