Round a float to a regular grid of predefined points

by

As long as your grid is regular, just find a transformation from integers to this grid. So let’s say your grid is

0.2  0.4  0.6  ...

Then you round by

float round(float f)
{
    return floor(f * 5 + 0.5) / 5;
    // return std::round(f * 5) / 5; // C++11
}

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