/// <summary>
/// Returns noise value at given point.
/// </summary>
/// <param name="x">X coordinate</param>
/// <param name="y">Y coordinate</param>
/// <param name="z">Z coordinate</param>
/// <returns>Noise value</returns>
public override float GetValue(float x, float y, float z)
{
int ix = Mathf.FloorToInt(x);
int iy = Mathf.FloorToInt(y);
int iz = Mathf.FloorToInt(z);
// interpolate the coordinates instead of values - it's way faster
float xs = SCurve.Interpolate(x - ix);
float ys = SCurve.Interpolate(y - iy);
float zs = SCurve.Interpolate(z - iz);
// THEN we can use linear interp to find our value - triliear actually
float n0 = m_source.GetValue(ix, iy, iz);
float n1 = m_source.GetValue(ix + 1, iy, iz);
float ix0 = Mathf.Lerp(n0, n1, xs);
n0 = m_source.GetValue(ix, iy + 1, iz);
n1 = m_source.GetValue(ix + 1, iy + 1, iz);
float ix1 = Mathf.Lerp(n0, n1, xs);
float iy0 = Mathf.Lerp(ix0, ix1, ys);
n0 = m_source.GetValue(ix, iy, iz + 1);
n1 = m_source.GetValue(ix + 1, iy, iz + 1);
ix0 = Mathf.Lerp(n0, n1, xs); // on y=0, z=1 edge
n0 = m_source.GetValue(ix, iy + 1, iz + 1);
n1 = m_source.GetValue(ix + 1, iy + 1, iz + 1);
ix1 = Mathf.Lerp(n0, n1, xs); // on y=z=1 edge
float iy1 = Mathf.Lerp(ix0, ix1, ys);
return(Mathf.Lerp(iy0, iy1, zs)); // inside cube
}
/// <summary>
/// Returns noise value at given point.
/// </summary>
/// <param name="x">X coordinate</param>
/// <param name="y">Y coordinate</param>
/// <param name="z">Z coordinate</param>
/// <returns>Noise value</returns>
public override float GetValue(float x, float y, float z)
{
int ix = Mathf.FloorToInt(x);
int iy = Mathf.FloorToInt(y);
// interpolate the coordinates instead of values - it's way faster
float xs = SCurve.Interpolate(x - ix);
float ys = SCurve.Interpolate(y - iy);
// THEN we can use linear interp to find our value - biliear actually
float n0 = m_source.GetValue(ix, iy, 0);
float n1 = m_source.GetValue(ix + 1, iy, 0);
float ix0 = Mathf.Lerp(n0, n1, xs);
n0 = m_source.GetValue(ix, iy + 1, 0);
n1 = m_source.GetValue(ix + 1, iy + 1, 0);
float ix1 = Mathf.Lerp(n0, n1, xs);
return(Mathf.Lerp(ix0, ix1, ys));
}