converting javascript to c#

Questions & Answers
1

Hey, I ran into a problem and I don’t know how I can fix this, this task is easy to do in javascript, but for me it’s quite harder in c#

For an example of my problem I’ll give you a part of the script in js:

	RightSki.rigidbody.AddRelativeTorque(0,- MovementSpeed, 0);
	LeftSki.rigidbody.AddRelativeTorque(0,- MovementSpeed, 0);
	LeftHand.hingeJoint.motor.force = MovementSpeed * Input.GetAxis("Horizontal") * Time.deltaTime;
	LeftLeg.hingeJoint.motor.force = - MovementSpeed * Input.GetAxis("Horizontal") * Time.deltaTime;
	LeftFoot.hingeJoint.motor.force = MovementSpeed * Input.GetAxis("Horizontal") * Time.deltaTime;
	LeftHand.hingeJoint.spring.spring = 1;
	LeftLeg.hingeJoint.spring.spring = 1;
	LeftFoot.hingeJoint.spring.spring = 1;

So this works perfectly, but when I tried making it in c#:

		//Hand
		leftHandObject.hingeJoint.motor.force = MovementSpeed * Input.GetAxis("Horizontal") * Time.deltaTime;
		leftHandObject.hingeJoint.spring.spring = 1f;
		//Leg
		leftLegObject.hingeJoint.motor.force = -MovementSpeed * Input.GetAxis("Horizontal") * Time.deltaTime;
		leftLegObject.hingeJoint.spring.spring = 1f;
		//Feet
		leftFootObject.hingeJoint.motor.force = MovementSpeed * Input.GetAxis("Horizontal") * Time.deltaTime;
		leftFootObject.hingeJoint.spring.spring = 1f;
		//Skis
		leftSkiObject.rigidbody.AddRelativeTorque(0f,-MovementSpeed, 0f);
		rightSkiObject.rigidbody.AddRelativeTorque(0f,-MovementSpeed, 0f);

when I did this in c# I get this error in most of the lines: error CS1612: Cannot modify a value type return value of `UnityEngine.HingeJoint.motor’. Consider storing the value in a temporary variable

So I tried making a temporary value that was like this: float motorForce1 = MovementSpeed * Input.GetAxis("Horizontal") * Time.deltaTime; and replaced:

leftHandObject.hingeJoint.motor.force = MovementSpeed * Input.GetAxis("Horizontal") * Time.deltaTime;

with:

leftHandObject.hingeJoint.motor.force = motorForce1;

but I still get the same problem, so how do I get this to work?

thanks in advance

2

You need to use a temp variable for the joint, as well as its motor property.

using UnityEngine;
using System.Collections;

public class Example : MonoBehaviour 
{
	HingeJoint joint;
	float motorforce1 = 5.0f;
	JointMotor motor;
	
	void Awake()
	{
		joint = GetComponent<HingeJoint>();	
		motor = joint.motor;
		motor.force = motorforce1;
	}
}