Actionscript 3 :: 3d Intersections Of Triangles Algorithm - Displaying The Top Most Plane?
Jul 30, 2011
I am trying to calculate the top most intersection of an arbitrary number of planes, with no joy! I am using actionscript, but just need find an algorithm that i can implement.
Problem:
consider 3 vertical axis.The user enters 3 points for each triangle/plane such that the points of the triangle lie on one of the axis.The user can enter an arbitrary number of triangles I need to find the topmost layer of these triangles and display it on the screen as well as the coordinates of interection.
Here is a picture to clarify what I mean with 2 triangles:
However, when we allow for more than 2 triangles, I get awkward lines of intersection.
I'm doing this project, about 2 lines intersecting each other(the 2 lines are not always on the same position). I try to find the intersections point using collision detection method but how do I place an object on the intersections point? if(line1.hitTestObject(line2)) // So this is how we find the intersection point but we do not know how to draw / place an object on the intersection point.
I'm building a small 3D engine for a game I'm working on. I've got my basics sorted: textured triangles with backface culling. However depth sorting is proving to be a difficult problem.I'm calculating the face Z by averaging out the 3 points that make up the triangular face. The longer faces sometimes overlap the smaller faces since they have a larger Z value and therefore rise up in the depth sorted display list.Is there a way I can use the area of the polygon to influence the depth sorting in any way? Or are there algorithms to accurately detect which triangle is above which triangle?
At first I thought making tringles out of Polys was an easy concept. Considering I start with a quad of ABCD then I could convert this to two triangles of ABC and ADC, which is easy. However an alternate answer is BCD and BAD. The real differnce between the two outputs is exacerbrated when I now calculate the Normals for the two new faces. Also in some cases the edges break against the UV texture map in an undesirable way. Obviously in choosing the output faces I should be choosing the method as well that doesnt produce highly acute angles above all else. Unfortuantely I also have a number of pentagons and hexagons to render as well.
This is a test program to measure the time it takes Flash to draw a triangle 10,000 times. The app (code below) calls runTimeTest() every N seconds which draws the triangle 10,000 times. Now for the "interesting" part: each call takes increasingly more processor until after about the 6th or 7th call it goes to "infinity" (see screen shot of TaskManager) Weird bug or explainable??
I am trying to achieve something similar to the flash movie in the below link. [URL]. As we drag the points of the triangle, the coordinates labels, ( A(1,2)) are properly aligned and arrange themselves so that they never collide with each other and never falls inside the triangle.
I am looking for useful tips for reducing or removing triangle overlapping in Away3D.I already tried to increas segmentsW and segmentsH but it doesn't solve the problem.Here is a snapshot of my problem (The complex cubes are made of Plane objects, Maybe there is a better way to build the complex cubes ?)
I'm not that familiar with AS3 but I got a script from someone where some objects are drawn.I want to add several triangles so that each triangle can be dragged on the stage.
Code: package app.simpleShapes { import flash.events.TUIO;// allows to connect to touchlib/tbeta
what's the main idea behind 3D in Flash. I mean, I've seen a lot of scripts to make rotating squares or triangles or whatever, but never managed to understand how they were made.
Im trying to figure out how to travel along a plane to a point in 3d space. It needs to feel as though travelling down a road. I have attached a swf with the desired effect. Im using the formula scale = fl/(fl + z);the problem im having is it looks fine until scale is > 1. I need the plane to stay central to the screen.
how to rotate a 2d plane in 3d? for example... i want to load a jpeg in to a movieclip, and then, using actionscript, flip the photo around so essenitally you're looking at the back of it.i've seen the Scripting 3D in Flash kirupa resource, but it's a bit advanced for what i need. i only want to flip a 2d plane 180 degrees.
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.
I have a 2d plane rotated on its x axis, with 2d display objects I want to move around on the plane. Its pretty similar to a chess board [URL]..
The board is a rotated rectangle, and the pieces are just 2d display objects. Whats the easiest way to manipulate those objects so they appear to be moving on the board?
I have an array of points and I need square planes to be drawn between these points and distorted if points change their coordinates (see what I mean in the attached file).So what is the best practice I should use to create such set of planes knowing just coordinates of the points (planes vertices)?
I am having trouble getting a spaceship to fly through space in 3 dimensions. I was wondering if anyone knows of like some good example source code for 3D plane flying movement?
Or if someone could point me in the right direction for the Trigonometry equations,
I add an FLVPlayback component on to a Papervision Plan. So far so good. Video plays, 3d works. But I am facing two issues:
1. Even though I set my MovieMaterial to interactive, I canot click on the controls. I have found someone else that stumbled onto something similar (link 1, link 2), but since they did not have answer, I though of asking here.
2. The FLVPlayback is jittery. What I mean is that the component's x position moves all the time from something like 0 to 10 or 20, then back to zero. Remember in the old days of analog television (if you're old enough) when you had to play with the tracking? It looks like that.
This is a test program to measure the time it takes Flash to draw a triangle 10,000 times.
The app (code below) calls runTimeTest() every N seconds which draws the triangle 10,000 times.
Now for the "interesting" part: each call takes increasingly more processor until after about the 6th or 7th call it goes to "infinity" (see screen shot of TaskManager)
if I take a square, turn into a Movie Clip, addjust the Perspective Angle, and the Vanishing Points. Then I rotate the square along the x axis so that the square is now a plane laying on the z axis. How do I get the length of the Movie Clip? I need to know when a plane starts and ends on the z axis. I also need to get the width.
if I take a square, turn into a Movie Clip, addjust the Perspective Angle, and the Vanishing Points. Then I rotate the square along the x axis so that the square is now a plane laying on the z axis. How do I get the length of the Movie Clip? I need to know when a plane starts and ends on the z axis. I also need to get the width.
I have a wall of Planes at different angles and positions. I'd like to get the camera to rotate and look straight at the focused plane. I have created a dummy Plane (lookAtMe) that tweens to the Plane I click on as follows:
private function planeClicked(e:InteractiveScene3DEvent):void { lookAtTarget.copyTransform(this);
[Code]....
The camera centers on the looAtMe Plane but doesn't rotate so that the selected Plane is straight on.
I want to the badguy plane to hit the player's plane and take a subtraction from the player's heath. I've fiddled around with using "this" instead of the full path of the playerMC - no success. My hitTest is working fine for the bullets!
A longtime AS2 developer finally making the transition to AS3 and Papervision all in one big leap.Working from Lee Brimelow's awesome pv2 tutorial as a base I've been able to create a plane with a movieclip mapped to it. What I'd ideally like to do is limit the rotation of the plane to maximum of -45 to 45 degrees on the X and Y.[code]I've tried using basic conditionals to restrict p.rotationX and p.rotationY but they seem to be ignored.
don't know what trigger this on my Flash CS4, suddenly i cant see any object on my stage it just plane background and i can change its color, but when i start to draw i can see the initial drawing but when i release the mouse the object is gone, try to test the movie and the object is there. i try to close the program and open again but still the same until i discover that this behavior happen when my publish setting is set to action script 3.0 changing it to 2.0 and the problem goes away. i did not encounter this kind of behavior with as3 before.
how to perform a search in XML, so I use the above method, kinda hard code I know...for example, I try to search " keyIn:String = "BR1014"; " means I wanna search BR1014 in 4 XML files, so I load the XML info into an array, and using for loop to loop the XML array (in this case TitleArray1[i], TitleArray2[i]...) and compare it with keyIn (which store the value BR1014), some how the value is located in TitleArray4[i] which have the length of 12 (trace(TitleArray4[i].length) = 12)
so everytime I run it, I will overwrite abc 12 times... and out put 12 time the abc value, in this case BR1014 was located in TitleArray4[3], so the 4th output of "abc" is BR1014 but others is all 999...
