I need to know what side of a rotated box my sphere/point is colliding with and at what angle.
I could perform the 4 lines check but I think it will be too cpu consuming. I need it for fast simple physics simulations(bounces)..
Quick question which is giving me difficulty, but I'm probably missing something...
How would I create a bounding box for any graphic, which can accommodate the graphic while bring rotated?
Simply making a square with the maximum of width or height doesn't cut it... think for example holding a T..
The AS3 getBounds function returns a rectangle that is not fitting tightly to a rotated ellipse. Instead it returns an axis-aligned rectangle based on the bounds of a rectangle whose width/height corresponds to the max/min diameter of the ellipse and follows its rotation.
Stack Overflow Q/A about the math of ellipses and bounding boxes
Based on this I took a stab at coding a solution in AS3. So far I have been able to produce a rectangle that fits perfectly along the x-axis, but as I rotate my ellipse it acts very weird along the y-axis. Rather than alternating between 2*r_min and 2*r_max while rotating, it alternates between 2*r_min and 0. My best guess is that I have done something wrong when solving the differentiated t for gradient -> infinity...
Here is an example from my code:
var r_max:uint = 45;
var r_min:uint = 20;
var rot:Number = ellipse.rotation * (Math.PI / 180);
var t_nil:Number = Math.atan( -r_min * Math.tan(rot) / r_max);
[Code].....
for the past two weeks I've been working on coming up with a collision detection system for my game in flash CS4. No matter what I try for some reason I just can't seem to do it, and I don't know how to fix it. This has never been an issue for me, I would even settle for basic rectangle to rectangle collision if I could, but no matter what I do I end up screwing it at all up. Somehow the collision detection either doesn't work at all, works for one side and jumps the guy through the wall on any other side or I think at one point it worked for two sides as long as I didn't hold down more than one movement key.
I've constantly scrapped what I've done over and over, right now I have no source code to present. I'm totally lost and confused, and my deadline for getting this done is today in a few hours. I really wanted to figure this out on my own but honestly I just don't see what I can do, I've got sphere to sphere collision detection working perfectly for my player and other spheres, but the walls are squares lined up to form long rectangles, and I just can't seem to get it to work. I'm dynamically loading the square-wall blocks as tiles to form a dynamically loaded map, and then I'm iterating through each individual block to determine if collision has occurred with the player. I think somehow I'm not managing the results right, or maybe I somehow need to be able to determine which direction the player hit the wall from, but I just don't know how to do it.
I've been staring at the screen for the past 3 hours trying to work something out but nothing is coming to me, example from a flash-type game or something similar I would be very grateful! (I've done this countless times in C++, C#, and java. I don't get what is going on in flash :-(((( )
I want to navigate a maze and therefore I want to create collison detection with the maze itself, but when I try the collison is made with the entire maze movieclip, so even if my character is safe in a corridor without touching the walls of the maze it still counts as collisons.
View 1 RepliesI am currently making a game based on slicing other objects, basiclly when you hold down and drag your mouse and then release it an object that shows the cut will be created.
//Sliceline.as
package
{
import flash.display.Bitmap;
[code]....
if anyone has any info on animating a point around a "sphere" with actionscript. If anyone has an actionscript equation defining this motion
View 4 Repliesit's easy to test collision between two squares. how do I test the collision if they are rotated?
View 1 RepliesI have a rectangle of any arbitrary width and height. I know X,Y, width, and height. How do I solve the upper right hand coordinates when the rectangle is rotated N degrees? I realized if it were axis aligned I would simply solve for (x,y+width). Unforunatly this doesn't hold true when I apply a transform matrix on the rectangle to rotate it around its center.
View 2 RepliesI have a Movieclip (MC1) with and moving object (OBJ1) inside it and using AS3. I want to do a hit test on it with another object (OBJ2) that is on the stage. Normally I would just do MC1.x + OBJ1.x to get my coords for the hit test. But how do I do it if MC1 has been rotated?
View 2 Repliesi need to check if a point is within a rotated rectangle. I have to do this mathematically, as none of the objects are on the stage so i can't use hitTestPoint. I know the position and rotation of the rectangle, and if necessary can get the four corners as points as well.
I kind of feel silly asking this, because i am pretty sure it's not a hard thing to do, i just can't work it out and so far any google searches just bring up hitTestPoint.
Is it possible to make a bounding circle instead of a bounding box?The objects should bounce INSIDE the circle.I have now a bounding box outside the circle, but the objects exceeds the circle at the corners.
I was thinking of making an array of Points on the edge of a circle and when the object is < or > then do something... but that would be a lots of if/else statements.
I've found the BitmapData.hitTest() function very handy, but limited for my purposes. I need to figure out at exactly which point the two images collide (in any coords system,really), since their behaviour will change depending on the angle of the surface hit
View 9 RepliesBecause I want to detect collision between a point and an MC contained within another MC.
View 1 RepliesI got a working broad phase and collision detection is fast enough.Now my collision response is working, but slow. I have trace(using getTimer()) through the whole resolving method, and I found the slow spot is where I get the collision point and normal vector.
Right now, I test each point on each shape against each line on the other shape. This works nice on triangles, but other shapes, it much to slow.I would think that using SAT(seperating axis therom) would have a way to get this when checking collisions, but I cant seem to get it.I need a fast way to get the collision point and normal vector.(Right now, it takes about 3 milliseconds per collison on a rectangle with 4 points and 4 lines)
In my file (AS2), I have a small square at the middle of the page. Diagonally to the right, I have a vertical wall which is a rectangle. Pasted inside my small square, I have the code:
onClipEvent(enterFrame) {
if (Key.isDown(Key.RIGHT)) {
if (this.hitTest(Wall._x, Wall._y, false)) _x =
[code]......
Code:
package {
import flash.display.Sprite;
import org.papervision3d.cameras.Camera3D;
[Code].....
I've imported the correct folder in my Edit->Prefences->ActionScript 3.0 settings. I've instantiated an object and it compiles, and I'm not getting any errors but, nothing shows up on the screen.
I'm doing 3d gallery in AS3 and i have run in to huge problem. After ActionScript creates 3d sphere it doesnt go away no mater if i go forward or backwards in timeline.
View 0 RepliesI am making a splash screen for a program and I have a picture in my head of a spinning sphere with pictures on it.I've already made my sphere and mapped my design onto the sphere in illustrator, although it is not as clear as I wanted.How do i get the sphere into flash and animate it to spin continuously?
View 1 RepliesHow would you do it? Or, else, how would you create a world? I.e. what I need is to place the sphere in the way the distance form the camera to it's center is less then the sphere's radius.
View 2 Repliesi'm trying to achieve the effect of a rotating sphere given a regular 2D texture. the best thing i've seen is a tutorial on emanueleferonato.com which gives this result: emanueleferonato dot com /downloads/mapping09.swf as you can see, it works pretty well when you're moving left/right OR up/down. it fails to simulate realistic rolling when going in any diagonals (since it's a very simplistic illusion). how to render such a sphere given any point on a mercator projection and then have the sphere rotate in an arbitrary (but fixed) direction? this is a bit advanced math stuff.
btw, if anyone's interested, i figured a better displacement map than what is used in the link i showed
i started my search again and immediately bumped into this: [URL] it's library called BitmapSphere and it does exactly what i need it to! also, could admin edit this and put together the link or something? i find it highly annoying that i need 50 posts before being able to post a link
The basic concept: I want to at runtime overlay (or paste or whatever) one bitmap image asset onto another. The original image asset is a texture on a 3d sphere.Example:3D Sphere with earth texture applied to it. Put a cloud on the earth texture and have cloud move along the earth.
Caveats:Can't use any composite materials because I take a serious perf hit. Want to try working only with bitmaps to see if it is faster.I've gotten this far but don't know how to fill rectangle with jpeg file and certainly have no idea where to go from here..earthBitmap= new BitmapData( 256, 256, true); fillRect will only do a color ... I need what fills a rect with jpeg image and how to edit a bitmap on the fly.
I am trying to rotate a sphere with the mouse on the x and y axis but the sphere keeps 'roll'ing and flipping it all around.
package {
import flash.display.Sprite;
import flash.events.Event;
import flash.events.MouseEvent;
[code]....
i am developing an application where client can add his photos to appear on a sphere or ball or coffee cup and able to save them and give it for printing using flex. like itasveer.com site. i tried to use away3D but if the image is small it is stretched and added to sphere. i dont want it to strech instead the original image shud appear on the sphere. if it is added to cup it shud cover only the circular part it shud not add this to top and bottom.
View 1 RepliesHow position plane in sphere papervision3d as3 ?
I have a problem , how position a plane in surface of sphere.
The effect I would like to achieve is when the plane around the sphere is clicked, the sphere rotates so that the plane is in the middle of the stage. but there always some problems when i clicked the plane the sphere seems like never rotate to it's back.[code]
View 3 RepliesI want to attach spheres to rotating sphere but I've encountered some rotation problems:
In application u can rotate mainSphere in both x and y axiss'.
If I rotate main sphere in only x axiss or only y axiss, it works correctly. But if I rotate main sphere around both x and y axiss, sphere is attacing the wrong place.
Here is the code:
ActionScript Code:
// these are the spheres containers. Sphere container class extends form object3d
var mainSphere:SphereContainer3D;
var attachingSphere:SphereContainer3D;
[Code].....
I am a newbie to Papervision. I want to design a sphere with 8 holes around one of its diameters. How do I do it? How do I draw anything on a sphere in Papervision?
View 1 RepliesI want to create an animating sphere representing the earth but here is the catch I want the users to be able to spin it round in real time, what tools will do the trick?
View 3 RepliesI want to create a 3D cylinder, sphere, cone using Actionscript for Flash Player 10. Is there any available class? I also want to know how to paint gradient, wrap text and texture around them. It would be nice if these class have these functions. I can't use non DisplayObject in this project so PV3D is not an option
View 2 Replies