public void ComputeTransferFunction()
{
Vector4[] transferFunc = new Vector4[256];
Cubic[] colorCubic = Cubic.CalculateCubicSpline(mColorKnots.Count - 1, mColorKnots);
Cubic[] alphaCubic = Cubic.CalculateCubicSpline(mAlphaKnots.Count - 1, mAlphaKnots);
int numTF = 0;
for (int i = 0; i < mColorKnots.Count - 1; i++)
{
int steps = mColorKnots[i + 1].IsoValue - mColorKnots[i].IsoValue;
for (int j = 0; j < steps; j++)
{
float k = (float)j / (float)(steps - 1);
transferFunc[numTF++] = colorCubic[i].GetPointOnSpline(k);
}
}
numTF = 0;
for (int i = 0; i < mAlphaKnots.Count - 1; i++)
{
int steps = mAlphaKnots[i + 1].IsoValue - mAlphaKnots[i].IsoValue;
for (int j = 0; j < steps; j++)
{
float k = (float)j / (float)(steps - 1);
transferFunc[numTF++].w = alphaCubic[i].GetPointOnSpline(k).w;
}
}
for (int i = 0; i < colorarray.Length; i++)
{
// Debug.Log(i+" "+transferFunc[i]);
if (transferFunc[i].w > 1)
{
transferFunc[i].w = 1;
}
if (transferFunc[i].w < alphaValueThreadshold)
{
transferFunc[i].w = 0;
}
colorarray[i] = transferFunc[i];
//Debug.Log(i + " " + transferFunc[i]);
}
// material.SetColorArray("_ColorArray", colorarray);
}