Closed. This question needs details or clarity. It is not currently accepting answers.
Want to improve this question? Add details and clarify the problem by editing this post.
Closed 3 years ago.
Improve this question
I've got an issue in my VR project. I'm trying to move one object based on rotation of another one and first one should move only in kind of borders. I'm using a raycast to detect and control these objects. Both should go in x direction.
1 - Object that I rotate
2 - Object that should move
Any tips? Thanks in advance!
Well this looks like a lathe so I asume that you want to move the tool post over one axis when rotating the wheel.
You want to "link" them, so what I would do is rotate the wheel using a method that also moves the tool post.
Try this:
public float ratio = 1.0f;
public GameObject wheel;
public GameObject tool;
public void RotateWheel(float amount)
{
wheel.transform.Rotate(Vector3.forward * amount);
tool.transform.Translate(Vector3.left * amount * ratio);
}
Note the following:
Amount is passed as degrees.
Ratio is the ratio between wheel
rotation and tool translation. At 1, for each degree, the tool moves
1 unit. Adjust it at your will. I assumed the orientation of your
moving parts based on the model. Try changing the vector directions if they do not work as expected.
Related
Closed. This question needs details or clarity. It is not currently accepting answers.
Want to improve this question? Add details and clarify the problem by editing this post.
Closed 1 year ago.
Improve this question
I'm trying to implement a lot of poker chips using Unity.
But poker chips are moving like a spring.
I want to implement poker chip in real world using Unity physics.
I tried modifiying the value on Rigidbody (Mass, Drag, Angular Dag, etc.)
and also tried modifiying Physics Material.
But Those didn't work.
I want to remove bounce of poker chips.
Sorry for my bad english.
please help me.
Here is my link
https://www.youtube.com/watch?v=Lw02Jkpfw2I
and a poker chip prefab
enter image description here
Maybe your problem can be solved by adding a physics material.
Right click in the project hierachy and create a new Phsyic Material and set its values to something like this. I have named the object ZeroBounce.
Add the Physics Material to the colliders of your chips and your floor.
You should immediately see a better result.
If the above solution doesn't satisfy you you could also add a script that limits the velocity of the chips. It will slowly lower its vertical speed to zero if it is going up. This will result in a small bounce which I think is a bit more realistic. A damp value of 10 looks pretty smooth to me. You can also just straight up set the y velocity to zero like this: currentVelocity.y = 0; instead of the lerp method. Then you won't have any bounce at all.
public float damp;
void FixedUpdate(){
var currentVelocity = rigidbody.velocity;
if (currentVelocity.y <= 0f)
return;
currentVelocity.y = Mathf.Lerp(currentVelocity.y, 0, damp * Time.fixedDeltaTime);
rigidbody.velocity = currentVelocity;
}
Closed. This question does not meet Stack Overflow guidelines. It is not currently accepting answers.
This question does not appear to be about programming within the scope defined in the help center.
Closed 4 years ago.
Improve this question
I'm trying to build a 2D physics engine (rigid body dynamics simulation) in C#. So far I have simulated boxes (squares) of different sizes which are fixed in position but can rotate around their centroids (centre of mass) when a force is applied to them. This is the Box.ApplyForce() method that is called when a force is applied:
public void ApplyForce(double x, double y, Vector force)
{
//angular acceleration = torque(angular force) / moment of inertia
Force tempForce = new Force(x, y, force.X, force.Y);
forceList.Add(tempForce);
Vector displacement = new Vector(x, y);
double torque = displacement.X * tempForce.yForce - displacement.Y * tempForce.xForce;
double momentOfInertia = (mass*(size*size*2))/12;
angularAcceleration += torque / momentOfInertia;
}
Now this seems to be working correctly so far, but I now need to include translational acceleration in my simulation so my question is: what happens when you apply force to the edge (or any non-centre-of-mass point) of the object? Will the translational acceleration be the same as if it were applied to the centre of mass?
Are these simulated squares on a flat surface when simulating translational motion? Can they rotate when the force is applied, and also move translational?
If the box is on a flat surface it cannot rotate when you are simulating translation acceleration it does not matter where the force is applied. It just matters the angle at which the force is applied, or the component of the force vector in the direction of the translational motion. The component of the vector perpendicular to surface will affect the magnitude of the normal force, which will affect the frictional force if that is something you are taking into consideration.
If the box is not on a surface and just floating in space when the force is applied the answer gets a bit more complicated. Maybe clarify what you are simulating a bit more.
Closed. This question needs to be more focused. It is not currently accepting answers.
Want to improve this question? Update the question so it focuses on one problem only by editing this post.
Closed 3 years ago.
Improve this question
I think it is simple, but I don't find the solution. I want my player to move some times red boxes and others blue boxes. I tried to freeze box X position when player collides, but then I have moving platforms so it doesn´t work. I tried to increase the mass, but I have also problems with some situations. Can I know the force that the player is applying in the box in order to apply exactly the inverse force ? Do you think another way ?
Yous shouldn't be freezing the position or changing the mass to get this effect.
If you don't want move any object to be moved by another object, enable Is Kinematic on that Object.
Is Kinematic description from the doc:
If enabled, the object will not be driven by the physics engine, and
can only be manipulated by its Transform
public Rigidbody redBoxes;
public Rigidbody blueBoxes;
Don't move Red and Blue Boxes by another object(Player)
redBoxes.isKinematic = true;
blueBoxes.isKinematic = true;
Allow movement of Red and Blue Boxes by another object(Player)
redBoxes.isKinematic = false;
blueBoxes.isKinematic = false;
Closed. This question needs to be more focused. It is not currently accepting answers.
Want to improve this question? Update the question so it focuses on one problem only by editing this post.
Closed 4 years ago.
Improve this question
I want to make the player move by a specific amount (1 tile/unit in this case) and then stop him. Just like in this video:
http://www.youtube.com/watch?v=DotOAbNngc4
By pressing a key the player should move smoothly to the next tile, than stops and so on.
How can I archieve this? (in C#)
You could take a look at GridMove which is from UnifyWiki.
You would probably get more of a response if you posted this question to answers.unity3d.com or forum.unity3d.com as these forums are specifically target towards Unity3d.
Here's what I would do: you give your player class a target field, e.g. a 2d vector. This will either contain the current position of the player (when initializing or when the target has been reached) or the target that you want to move the player to.
Now in your update you do this:
if target equals your current position then check user input for movement.
if user requests movement set target to position adjacent to current position.
else slowly move player towards target.
You may want to create a field for the current position of the player besides the normal position in GameObject. You could then update GameObject.position in the update-cylce by a small delta until the positions of GameObject.position and target have the (roughly! use epsilon when comparing) same value.
Some hints
Vector2.MoveTowards can help you
To check if the target and position are "close enough" you could subtract one from the other and look at the resulting vector's magnitude.
Beware of overshooting when you move towards the target. If your movement distance is more then or equal to the distance between position and target, just set the position to the target.
Closed. This question needs details or clarity. It is not currently accepting answers.
Want to improve this question? Add details and clarify the problem by editing this post.
Closed 8 years ago.
Improve this question
In my case I have a starting coordinate x,y,z, an orientation in Quaternion and I know the moved distance.
Basically I would like to know the x',y',z' after applying the transformation and the forward movement. So I am trying to move a point in 3D using quaternion. I guess it should be just a simple calculation but for some reason I cannot find the solution that easily.
In previously I converted the Quaternion to Euler angles and used them to calculate the x',y',z'. Unfortunately because of the Gimbal lock this solution is not suitable for me anymore.
I have found a few example for example this one in python and here's an other in C#, but I still did not get the formula of them as they are discussing the rotation instead of the movement it self, the C# example just changes the middle point of the cube and then it redraws it with the rotation.
Why reinvent the wheel ? This kind of operation is best handled via matrixes - and C# has even support for it.
// PresentationCore.dll
using System.Windows.Media.Media3D;
Matrix3D matrix = Matrix3D.Identity;
matrix.Translate(new Vector3D(x, y, z));
matrix.Rotate(quaterion);
var newPoint = matrix.Transform(point);