AddForce to sphere

Question

I have a sphere with rigid body, (Is Kinematic = False) and Configurable Joint (Configured in World Space = True); using AddForce(0, 500, 0). The sphere's movement still depends on it's rotation.

 #pragma strict
 
 var moveSpeedX = 15;
 var maxSpeedX = 15;
 
 var baseSpeed = 0;
 
 var jumpForce1 = 450.00;
 var jumpForce2 = 200.00;
 
 
 private var doubleJump : boolean = true;
 private var grounded : boolean = false;
 
 
 function Update()
 {
     
     if(Physics.Raycast(transform.position, -transform.up, 1)) {
       grounded = true;
       doubleJump = true;
    } else
       grounded = false;
     if(Input.GetButtonDown("Jump")) {
         if(grounded) {
         rigidbody.AddForce(0, jumpForce1, 0);
         }
       else if(doubleJump) {
          doubleJump = false;
          transform.rigidbody.AddForce(0, jumpForce2, 0);
       }
       
         
     }
     
         
     if(Input.GetKey(KeyCode.LeftArrow)) {
         if (transform.rigidbody.velocity.x > -maxSpeedX) {
             transform.rigidbody.velocity.x = transform.rigidbody.velocity.x - (2*moveSpeedX) *Time.deltaTime;
         }  else {
             transform.rigidbody.velocity.x = -maxSpeedX;
         }
     }
     if(Input.GetKey(KeyCode.RightArrow)) {
         if (transform.rigidbody.velocity.x < maxSpeedX) {
             transform.rigidbody.velocity.x = transform.rigidbody.velocity.x + (2*moveSpeedX) *Time.deltaTime;
         }  else {
             transform.rigidbody.velocity.x = maxSpeedX;
         
         }
         
     }
 }

Also tried using: rigidbody.AddForceAtPosition(myForward * 1000.0, rigidbody.worldCenterOfMass); That didn't work either. Sorry for question that a million noobs like me have already asked, but I can't get it to work.

Answer 1

Best Answer

Answer by JanWosnitza · Oct 03, 2012 at 08:08 AM

rigidbody.AddForce(..) should work as expected. But your raycast should look like t$$anonymous$$s:

 if(Physics.Raycast(transform.position, -Vector3.up, 1))

I also recommend you to use:

 rigidbody.AddForce(0, jumpForce1, 0, ForceMode.VelocityChange);
 rigidbody.AddForce(0, jumpForce2, 0, ForceMode.VelocityChange)

so you can set the speed independently from the sphere's previous velocity (like SuperMario does) and the sphere's mass. Thus you must tweak your jumpForces again.

good luck ;)

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DrStyles · Oct 03, 2012 at 03:26 PM 0

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For some reason it didn't move with ForceMode.VelocityChange no matter how I set highjumpForce1, but it seems to work now with: rigidbody.AddForce(Vector3.up*jumpForce1, ForceMode.Acceleration); Thank you.

JanWosnitza · Oct 04, 2012 at 11:08 AM 0

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Your welcome. Maybe ForceMode.Impulse was the better choice since ForceMode.Acceleration is for accelerations (appling a force in every FixedUpdate ^^ e.g. custom gravity for diffent objects)

AddForce to sphere

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