Having a bit on an issue, what I want to achieve is a car that is drivable with a D-Pad. I am attempting physics joints on all 4 corners of the "frame" of the car. Then each "wheel" is applied a force to move it forward and backwards. Simple enough I think, can't even get the wheels to stay attached. I weld them to it, but then it won't move.
Second, steering?! How on earth is this accomplished?
Thank you very much, been stressed over getting it to work!
I'm not sure if this is helpful, but here's a link that may push you in the right direction: http://www.emanueleferonato.com/2009/04/06/two-ways-to-make-box2d-cars/. This is an example of what I believe you are looking for, but it's in AS3. However, it's using Box2D physics which is what the CoronaSDK uses. Should be able to translate.
Weld joins don't allow any kind of movement. Pivot joints would be a better choice and more realistic. As for the steering, if this is a top down game, you probably should apply force to the front region of the car and not each wheel as it could do weird things.
Related
Kinda what the title says, I have a "wall" made out of multiple segments specifically for modular purposes. I have a contactTestBitmask that forces the player to stop moving in the direction of the wall once collided, but, if you slide along the wall to another segment, the player just rolls straight through it. I cannot do a collisionBitmask as the player runs fast enough to "phase" through the walls. I also cannot do collision as my camera and lighting are also dependent on the player's movement and position, and will not interfere with the walls (I think). If anyone could help point me in the right direction to allow me to make solid modular walls, I'd greatly appreciate it.
Figured out the source of my problem, contact IS happening, I just have wonky flags and the system doesn't like that. I need a contact currently happening method, I guess
so I've been trying to see if I can make use of Wheel Colliders for the past several months now. As much as I've managed to figure out more and more things about how to set them up properly, there's some things I've been noticing that seem impossible to avoid:
Even if your friction sideways stiffness is lower, there's a chance that your car will continue to "spin" or "rotate" in the direction you were steering if you JUST hold down your input long enough to get the car beyond just rotating. I've noticed this will happen, whether for example the "SteerHelper" or "TractionControl" functions are doing their work or not. This will put a dent in ensuring smooth turn movement. Now, I don't know if maybe this is just due to realistic car physics (I mean, I can picture the car skidding in scenarios where they lost grip of the road for sure), but it just feels kinda glitchy. Sometimes, even when I'm not turning, the car will start to turn a little to the left or right and then gradually seem to "lean" that way in terms of applied torque to the rigidbody. I've seen many suggestions for trying to stop the rigidbody from doing this. Here is one way I'm trying to work against this:
rb.AddTorque(-rb.angularVelocity * 2);
However, it seems that the car will still "spin" more than intended. What would be ideal is to be able to MAYBE allow the car to turn a little extra after the left or right steer buttons were released (maybe more or less depending on the vehicle), and no more than that to ensure there is maximum control to give the engaged and maybe arcadey game play I've been going for for a long while.
It's been difficult to adapt an ideal friction curve value that would give the most ideal feel of a drift turn, especially a more arcadey one. I'm not trying to go for wide turns that slow you down, I'm trying to go for tight (yet controllable) turns that allow you to preserve most of your speed. I find that especially at higher values of stiffness, as I know many people have observed in other posts, that again, the car will turn back an extremely high amount sometimes (you drift left enough, a force is turning your vehicle way to the right). It's sad, because I've wanted to be able to say I've "mastered this beast" and used it for my purposes, but I don't know if that's really a good practical expectation for anyone. I even worked my own alternate friction curve values that would be used in the controller:
But I guess as some people say, you can't polish something that's broken? Moving to the third point...
I've read so many posts that show how to adjust a vehicle's center of mass, or to add more colliders in different spots to correct it, using scripting to add an offset to the center of mass, etc. So many tips that say, "lower the center of mass, you'll find it" and I give that a try. When the center of mass is too low, my car can get pretty shaky on the terrain (not that it hasn't in the past, but it's often been things I could correct, like the weird initialization of the attachedRigidBody of the wheel colliders themselves in the beginning, etc). High enough, and of course, (even when it's lower sometimes???) the car will just start spinning in the air on either multiple axes or specifically the forward z, when you drive off a ledge or bump into something with a high enough speed. It just seems inevitable.
I've been trying to give my benefits of a doubt. I like to think there's a correct way to use this thing, and that I'm just not familiar enough with Unity3D physics concepts. However, it just seems more and more that I'm investing too much time in a broken component - or, maybe I just never got the best grip of physics.
I was about ready to try just convex mesh colliders around my tires, and just abandon the idea of gripping physics altogether, but I'd love to hear suggestions to either address anything I've mentioned above, or just a more ideal package to move onto. I've glanced at packages like Vehicle Physics Pro, but I do want to be sure I'm getting something that makes sense.
Full disclosure: I'm in the middle of trying to make a game that feels incredibly similar to F-Zero, but with wheels.
Thanks in advance for any thoughts or suggestions you can provide.
(Maybe not an answer per se, but hopefully helpful.)
Note Unity also suggests to possibly give the car a constant downward force via script. It might be telling that such workarounds are officially given, one would think proper physics would, well, properly work without them.
There's some assets you might want to give a try generally:
One is the Unity Asset Store asset called Arcade Car Physics, and it's free. I've tried it and it works (but not sure if it works for your needs). It's using Unity's native Wheel Collider plus extra scripts.
Another is the Arcade Car Physics github project. It has nice plane stabilization and more, and works well. It's not using the native Wheel Collider.
Then there's this asset called Vehicle Physics. Instead of native Wheel Colliders, they've create a fully custom wheel system so that it would be more physically workable. The asset is not free, but they offer a free demo executable where you can drive around different vehicles, and that works quite well. (I haven't yet bought this asset myself.) As a downside, some reviews mention there's some complexity in setting this up (and I suppose future support for this custom Wheel Collider hinges on the company continuing to exist).
Good luck!
I was wondering if you could tell me if this is possible. I've spent a couple hours to no avail trying to find a way to make a object with box collider swing inwards and outwards like a door. I used hinge joint, but it will only swing the gameobject inwards or outwards around the joint. I am trying to achieve a 'saloon door' effect that allows free rotation around the y axis. I have tried fiddling with the anchor position and axis values but no luck. I was surprised not to find any similar problems online, perhaps hinge joint is not meant for this purpose? Any clarification is much appreciated.
I'm not really sure how I fixed it, but I got the door to swing freely. One possible reason is surrounding colliders or terrain prevented it from swinging freely. sigh
I am making a multiplayer top down 2D game with 3d elements. All my movement, healthbars and basic functionality is working flawlessly even while hosted and playing on a server, node.js socket.io. However In this game it is possible to move the camera like in Realm of the mad god.
in case you are in doubt here is a video: https://youtu.be/4tdcxl3aZ0c?t=31s
This of course means that the players can end up being upside down with regards to each other and I cannot find a solution that works in all regards to make sure the sprites of the other players are always facing the correct direction with regards to their movement.
I have made several solution to this problem which cover most scenarios but while play testing other things we always end up noticing that the sprites sometimes face the wrong directions. So I am wondering if anyone has an answer, the logic, the fixing this problem.
Things I have tried:
Adding a gameobject to the camera to which all sprites asses their change in distance and determine their facing direction based off that information. (this leads to the players sometimes flipping erratically when the camera is moved and they as well are moving as sometimes they may be moving slower and there although moving left the camera approaches from the right and that flips them)
Adding a gameobject to the world which allows all sprites to have a fixed point to which they can measure their change in distance and therefore also know what direction to face (this worked somewhat better as they always know what direction they have to face, however once the player is upside down everything is inverted)
Emitting to the other players wether I am upside down or not in order to try to reinvert the above solution in the case I am upside down. (I could not find a good way to do this, and it got me thinking that this must be a problem people have fixed before many times and perhaps someone know of a good solution that works.)
thank you all for your input.
I seem to have found a solution for this issue that works decently well. Keeping in mind that I do not want to have the server being involved in this and I would rather have each individual sprite know its direction rather that have something heavy trying to determine this logic I came up with the following solution. May not be the best but it works. Still very keen to hear other solutions.
On my main character I have a switch case, which changes depending on the players rotation in the world. I need this switch case anyway for fixing (http://answers.unity3d.com/questions/1348301/trying-to-change-the-cameratransparencysortaxis-to.html?childToView=1348316#answer-1348316) that issue.
As the cases change I simply place the gameobject that I want the sprites to compare their distance to at 1 of 4 positions. YPos, YNeg, XPos, XNeg. Meaning that the sprite now determines its facing direction based on a gameobject that is placed in accordance with the Players position. without having to place it on the camera.
I will update if during further play tests this gives me trouble but thus far it works in the all the cases I need it to.
Still very willing to hear other solutions to this problem.
Thank you.
I am going to work on a game project. I am using cocos2d. I want to use cccamera class of cocos2d. Please tell me about any tutorial on cccamera. I want to implement more or less like angry birds, throwing the ball that reaches its destination facing the obstacles in the way.
So when the ball moves ahead the scene accordingly moves back depending on speed of the ball.
How to manage all that. I think i should use cccamera.
Thanx.
CCCamera, per the documentation is used for 3D effects (http://www.cocos2d-iphone.org/api-ref/latest-stable/interface_c_c_camera.html) and recommends the use of CCFollow (http://www.cocos2d-iphone.org/api-ref/latest-stable/interface_c_c_follow.html) for 2D related effects (such as following the birds forward, etc).