I'm currently trying to implement a marble maze game for a WM 5.0 device and have been struggling with developing a working prototype. The prototype would need the user to control the ball using the directional keys and display realistic acceleration and friction.
I was wondering if anyone has experience with this and can give me some advice or point me in the right direction of what is essential and the best way to go around doing such a thing.
Thanks in advance.
Frank.
When reading your answer I didn't get the feeling you are looking for a game framework, but more: how can I easily model a ball with acceleration and friction.
For this you don't need a full fledged physics framework since it is relatively simple to do:
First create a timer which fires 30 times a second, and in the timer callback do the following:
Draw the maze background
Draw a ball at ballX, ballY (both floating point variables)
Add ballSpdX to ballX and add ballSpdY to ballY (the speed)
Now check the keys...
if the directional key is left, then subtract a small amount of ballSpdX
if the directional key is topleft, then subtract a small amount of ballSpdX and ballSpdY
etc
For collision do the following:
first move the ball in the horizontal direction. Then check the collisions with the walls. If a collision has been detected, then move the ball back to its previous positions and reverse the speed: ballSpdX = -ballSpdX
move the ball in the vertical direction. Then check the collisions with the walls. If a collision has been detected, then move the ball back to its previous positions and reverse the speed: ballSpdY = -ballSpdY
by handling the vertical and horizontal movement separately, the collision is much easier since you know which side the ball needs to bounce to.
last nu not least friction, friction is just doing this every frame: ballSpdX *= friction;
Where friction is something like 0.99. This makes sure the speed of the ball get's smaller every frame due to friction;
Hope this helped
I would recommend checking out XNA Studio 3, it has built in support for PC, Xbox 360 and mobile devices, and it's an official & free spin-off of Visual Studio from Microsoft.
http://creators.xna.com/en-US/
http://blogs.msdn.com/xna/
If you search around, people have written tutorials using physics (velocity on this one)
http://www.xnamachine.com/2007/12/fun-with-very-basic-physics.html
Try XFlib. It is in c++, but most cool things for the mobile have to be in c++, unfortunately. The site has some very cool free games. You can also see the source of most of the game too. Many have the physics you want.
Unfortunately, XNA doesn't support the windows mobile platform. However, as it seems that you're not having a problem with the technical issue of drawing on the WM device, but with the logic required to implement physics based movement, then it's not a bad idea to consider XNA to prototype the physics and movement code.
Check out some of the educational topics at creators.xna.com, and also "gamedev.net"
If you are at a loss, there's no mistake in trying a "lighter" tool for prototype. I would try Torque Game Builder - it spits out XNA, although maybe not meant for your platform.
At the Samples of the Windows Mobile SDK (check out the WM 6.0 SDK too), there are a couple of game applications. One of them is a simple puzzle game; not much, but it is a starting point.
The use of physics in game development is not specific for Windows Mobile. You can find a huge literature about this subject. This comes up in my mind now. If you are serious about game development, in any platform, you should do a little research first.
I dont know if this may help but i saw a Marble application for the Android platform on google code. Check it out here, it may throw some insight on the actual logic of the game.
The code is open sourced and written in java (using the android sdk) put nevertheless it may be useful. Also to better understand the code checkout the documentation for the SensorsManager, SensorEvent etc here
I wouldn't recommend using the same architecture as this application thou.
Related
I'm trying to implement hand gesture recognition for Oculus Quest with Unity and the Unity Oculus integration package.
I've read the "Hand Tracking in Unity" documentation on the Oculus developer website, but they only talk about getting the current pinch of the fingers, which is not what I want:
https://developer.oculus.com/documentation/unity/unity-handtracking/
I thought about getting fingers flexion for each finger (with a value between 0 and 1 for example), and then training a k-NN model with the 5 features to then be able to recognize the nearest gesture. But I've been searching for hours and didn't find anything about getting finger position, the only thing I found is getting the pinch.
By looking in the OVRSkeleton.cs file (from the Oculus Integration package), I've been able to get the current Transform for each bone (so the position as a vector and the rotation as a quaternion), but I don't really know how to calculate or get an estimate for the finger flexion with that (or anything useful to perform gesture recognition)
OVRSkeleton skeleton = GetComponent<OVRSkeleton>();
skeleton.Bones[(int) OVRPlugin.BoneId.Hand_Index1].Transform.position
skeleton.Bones[(int) OVRPlugin.BoneId.Hand_Index1].Transform.rotation
The list of bones IDs is in the "Hand Tracking in Unity" documentation page.
In fact, what I want to implement seems to look exactly like this package:
https://assetstore.unity.com/packages/tools/integration/vr-hand-gesture-recognizer-oculus-quest-hand-tracking-168685
Any help, ideas or comments about how to calculate fingers flexion, or any other solution to implement gesture recognition would be greatly appreciated!
Thanks
A few things/links I've explored so far:
https://www.reddit.com/r/OculusQuest/comments/elrn7a/unity_hand_tracking_and_different_gestures/
https://forums.oculusvr.com/developer/discussion/89615/detect-custom-hand-gestures
https://github.com/jorgejgnz/HandTrackingGestureRecorder is something im trying currently, the docs dont say it has a depenedency, but apparently it does, and i dont have it working yet.
you can access the bone rotations at runtime and compare those to a recorded gesture. i think its closer to "template matching" than machine learning, measuring the error between two poses.
Ok here is what Im trying to achieve - when user's feet collide with grass mesh, the mesh is secured to the ground at the base but the tops move away, then bounce back when foot is no longer there:
This example, and everything I've found however, are using billboarding/2d as grass. I want 3d, like these:
https://assetstore.unity.com/packages/3d/vegetation/plants/grass-toon-76674
Where some sort of collision is occurring, or Ive tried experimenting with unity's trees. Trying to find the most CPU/GPU effective (for Oculus app or mobile) way to do this.
Is this possible - to have interactive, 3d not 2d grass?
The only thing I can think of is to model each blade of grass as several bars connected by universal joints (I'm not sure what kind they would be in unity, but that is the mechanisms term).
Each joint could have a torque proportional to its angle, so the more you bend it, the harder it tries to flick back. Then its just a matter of adding forces to the blade structures as you bump into them.
This is more of a engineering solution than a programming one, and would require a little bit of math, so its probably not ideal. but it should work.
I am working on a Unity leap motion desktop project using latest versions of Orion and unity prefabs package. I have created a simple scene pretty much identical to the one in Desktop Demo scene. (pair of capsule hands and a simple object you can poke and move around)
https://developer.leapmotion.com/documentation/csharp/devguide/Leap_Coordinate_Mapping.html
This article covers all of the issues I am currently facing but so far, I was unable to implement these solutions in my project.
When moving hands from the maximum range of the camera for example left to right or any other direction, this only translates to a portion of available screen space, in other words, a user will never be able to reach out to the edges of a screen with their hands. From my understanding, the tracking info provided in millimetres by the camera is somehow translated into units that Unity can understand and process. I want to change that scale.
From the article, "You also have to decide how to scale the Leap Motion coordinates to suit your application (i.e. how many pixels per millimetre in a 2D application). The greater the scale factor, the more affect a small physical movement will have." - This is exactly what I want to do in Unity.
Additionally, even being able to what I think was a successful attempt at normalisation of coordinates using the InteractionBox, I am unsure what to do with the results. How or rather, where do I pass these values so that it will display the hands in an updated position.
I am trying to make a app in c# that will detect / classify 3 poses of human body which are standing, sitting and lying. I can correctly detect / classify 2 of them (sitting and standing) with skeleton tracking. When it comes to lying on the floor, Kinect seems to not be able to track skeleton of a human body.
Does anyone have any experiences with skeleton tracking in lying position? As soon as I lye down, I am loosing joints positions. Is this task impossible? Thank you.
The Windows SDK for Kinect V1 is not great at recognizing people lying down.
V2 improves a lot on this, I would recommend you to participate in the beta or wait for V2.
One possible solution with V1, is to place a second camera vertically on the floor, use seated mode - so it detects on motion - and see if you find a person with that camera and not on the other, then it is likely lying down.
I have not tested this solution, but in theory it can work - try to set it up yourself and see if it fits your scenario needs.
Anyone know how to use Goblin XNA to implement ball control in the same way as one might find in the board game labyrinth?
There don't appear to be any tutorials or information at all regarding how to do this, despite there being a demo video displaying just such a thing.
I've setup the environment and gravity and added the ground and a sphere. I use WorldTransformation.Decompose to extract the current orientation of the board. I know the next step will be either ApplyLinearVelocity or AddForce to the sphere based on the current board orientation, but I don't know how to constantly apply these methods to the ball so that the ball is moving in response to the movement of the ball. Adding code to the Draw or Update methods only executes the code a single time. Anyone familiar with Goblin XNA at all and able to help?
As far as I can see in Goblin XNA the Update and Draw methods are called the same way as standard XNA games. Can you give more specific information? source code perhaps?