For more than two days now I am struggling with this seemingly impossible problem: I have a composite GameObject (one parent, 10 children), each one hinged to at least another with angle limits and player-controlled motors. Moves perfectly as I wish.
Now I want to be able to flip it. After a while and many trials,rotation seems the best way in order to keep the angles (inverting localSpace does not respect them):
Vector3 rotPoint = new Vector3 (ParentGameObject.transform.position.x, myY, myZ);
ParentGameObject.transform.rotateAround (rotPoint, Vector3.up, 180.0f);
BUT, if the parent rotates as asked (180 degrees around its Y axis), every child flips but not around the same axis, rather around their own rotation center. This gives ridiculous results as hinges try to get back to the desired position. How could I fix this?
Many many thanks in advance...
In the end I figured out the problem. My problem had no valuable solution.
We can rotate the transform around the Y axis even in 2D, but NOT the rigidbody2D, which in the same object will invariably cause serious problems.
This is maybe one remaining inconsistency into Unity5's implementation of 2D.
I had to flip using localScale inversion and programmatically updated positions and rotations.
It sounds like the child GameObjects are rotating around their own pivots instead of the parents. I haven't got Unity installed at the moment to test this, but if you add an empty GameObject as a child of your parent (and with the same pivot point), then make all your other GameObjects a child of this, it should work.
You should not move or rotate a rigidbody if you don't have to. That will mess up the underlying physics calculations and physics engines won't be happy about it. Instead, you have other ways to interact with them
Apply force, torque
Apply acceleration, angular acceleration
Change speed, angular speed
If you have to move/rotate the object, you should also update positions, rotations, speeds, angular speeds of all of your hinged objects. That would not be easy. Give some more details if you unable to solve.
Related
in my 2d unity game, i am randomly instantiating zombies that I want to face their mouth towards the center where there is it's target because the bullets come out of their mouth which need to face the center. the zombie is a prefab and I have this code on it:
transform.up = -(kids.transform.position - transform.position); it is pretty much working and there are no errors except, randomly, sometimes it becomes really skewed and squished in weird ways. here is a picture of what it looks like when it is skewed:
how can I make it not get skewed? thanks.
Probably you scaled it or one of its parent Transforms uniformly. Possible solution: create a parent which is unscaled and do the rotations there. Maybe have a script to follow some other transform, like settings its position in an update, if need be. A child Transform of the unscaled Transform, which you rotate, can then still be ununiformly scaled.
I'm fairly new to game development and I'm trying to develop a 2D game in unity where the main character has a jetpack with two thrusters and I want him to control each one individually. So if he only turns on one thruster he goes 5 meters above ground and hovers there while using both would make him hover at a height of 10 meters. How would i go about doing this?
I tried just simply adding forces as if the character was jumping and freezing the y-axis to 0 until he let go of the jetpack button but that did not give me the feel i was looking for. I also tried raycasting a line out of the jetpacks to the closest surface and adding a force to the jetpack to allow the player to float at that height but that I couldn't figure out a proper way to implement it.
The Raycast sounds like a great idea. Do the raycast to the next available platform and do as #Ahndwoo said in a comment, `
What you would need to do is divide the force of your thrusters by the
magnitude of the Ray. Thus, as the Ray gets longer, the force
decreases.
By doing this you'll get the natural movement from a force and you'll control how high can you get.
I would Make your thrusters holder as an object and as more turbines it has, the more powerful i'll get.
It's a 360 Video application on Unity 3D.
I want to place several objects around the camera (which has a fixed position), but I need this objects to have the same distance (same radius) from the Camera (which is the center). How can I do this? Either on Editor or by code.
I have been manually displacing objects around the camera, by dragging them by arrow tool. But it's as inaccurate as a pain to do. :)
Any light on this would help me a lot! Not only me, but anyone working with 360 videos in Unity.
Thank you all in advance!
To solve your problem, an easy solution would be to add a child "child_of_camera" to your camera and then add a child "child_of_child" to the "child_of_camera".
Now that you've done this, move the "child_of_child" away to however far from the camera you'd like it to be. After this, apply the random rotation you'd like to "child_of_camera".
Duplicate "child_of_camera" to however many objects you'd like on screen and then rotate them all to your preference.
Now, when you're moving around the camera, these children will follow along with the camera.
If you're looking so that the rotation of the camera doesn't affect the objects there are two ways you can handle this:
Place camera and "child_of_camera" (this name would now be misleading and should be renamed) under an empty GameObject and move "empty_GO" on the X,Y,Z axis instead of the camera.
or
Create a quick script to attach onto "child_of_camera" so that it always sets the "child_of_camera"s world space rotation to Vector3.zero.
As I stated in the comments, this solution is most likely not the optimal way to fix your problem but it is definitely a very simple solution that is easy to understand and implement. I hope it helps.
I'm learning Unity 2D and I want to do something like this:
Basically the character runs into the box/edge and it falls over. BUT! I want to lock down the X axis somehow. So in reality it would kinda look like if it was just rotated simple by 90 degrees (with some kind of acceleration).
I've tried to do it with rigidbody2d and edgecollider and AddForceAtPosition, but I failed miserably.
What I really wanted to do is lock down the "wall" and apply the force at the very top of the rigidbody so it would just fall over to the right, but it simply didn't work out.
Any help would be appreciated!
Remember that same logic applies to physics in games as it does to physics in real life. Just make a hinge and put the anchor and connected anchor at the same location at the bottom and set a limit for hinge.
Wall:
Hinge:
I set Lower Angle to something near 90, otherwise wall becomes uneven when it drops.
Remember to put a Rigidbody2D and a Box Collider for wall.
Firstly, I would lock the rotational axes that you don't want to move on your rigidbody, then, if your object origin is located on the ground / bottom of the object, you can add rotational torque to the object to achieve the affect you want :) http://docs.unity3d.com/ScriptReference/Rigidbody.AddTorque.html
I'm making a platform game and I've looked at different ways to add collisions in a tile based game without rotation. But everything I look at assumes that in no case will one of the colliding objects be going fast enough to pass the other before collision is detected. I've tried using Box2D and Farseer but they were over complicated and ran quite slowly when making lots of tiles. I also tried my own method using 2D convex hulls but that ran too slowly as well. So is there a way to to detect collisions without a maximum speed or letting items pass each other that isn't over complicated and would work with lots of tiles? any help is much appreciated
Depend on objects and their movement and whole gameplay. if you are shooting bullet to some obstacle, you can calculate if bullet will intersect with obstacle before bullet hit it. you have positions, you can calculate distance between them. so you can check collision and distance.
other way, as #cwohlman suggested. you can have 2 collision boxes, one big "assumed" collision area and one excact that cover objects. so if object triggers assumed collision, you know that there i a chance that bullet will hit object and you do some detailed calculations if button will hit object or will pass above or under it. for determinating if object is in assumed collision area you can use circle collsion.
private bool DetectCircularCollision(Sprite a, Sprite b)
{
float radius = Math.Sqrt(a.Width / 2 * a.Height / 2 + b.Width / 2 * b.Height / 2);
float distance = Vector2.Distance(a.Position, b.Position);
if (distance < radius) return true;
return false;
}
so far i didn't encounter this problem, as all flying objects should be visible to players eye. if you move object 50px or 100px per frame player will not notice this or will be confused what is this.
You will probably need to combine few collision methods to achieve what you need. Advice, do not use pixel collsion as it's completly unnecessary and it's resuorce killer. Instead, cover objects with few bounding boxes or circles.
example where blue circle is assumed collision area, and red circles are exact collision area.
You might try a dual algorithm approach, using a simple algorithm first to deturmine if the objects 'might' have collided and if if so, use a complex algorithm to see if they did collide.