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I am trying to create a smooth function to interpolate a number to zero. Problem is, it isn't working. In this case, if I increase a number by 0.01 a specified number of times, I want to decrease that number by 0.02 until it is zero. Here is my function. 

float ReduceSpeed(float x)
{
    if (x != 0f)
    {
        if (x % 0.02f != 0 && x > 0)
        {
            x = x - 0.01f;
        } else if (x % 0.02f != 0 && x < 0)
        {
            x = x + 0.01f;
        }
        else
        {
            if (x > 0f)
            {
                x = x - 0.02f;
            }
            else
            {
                x = x + 0.02f;
            }
        }
    }
    return x;
}

I want to use this to create a kind of sliding motion in unity.

  • 1
    Do not use modulo (%) operator for floating point numbers, unless you really need it and know its limitations. It's almost never needed. – PMF Oct 13 '18 at 19:05
  • Is there any reason why you avoid Lerp or SmoothDamp? – Nikaas Oct 14 '18 at 08:48

1 Answers1

2

The problem most likely lies in the line 

if (x != 0f)

x is very likely to not be exactly zero due to rounding errors, since 0.01 and 0.02 are periodic numbers in base 2. You should choose a small value (epsilon) that you would compare the absolute value of x against, e.g.

if (Math.Abs(x) < 1E-10)
adjan
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