Mike Williams <mik### [at] econymdemoncouk> wrote:

> Just for fun, here are some images generated by using the source image as an
> isosurface pigment function.

Here are 3 isos with bicubic interpolation.
They use different coefficients for the interpolation:

image_map
{
  png "hf_map.png" 
  interpolate 3
  #local s=2;
  #local A=.5; // other two images: A=.7 / A = 1.0 (default)
  matrix <(-1-s*A+s)/s, (-s+3*s*A-1)/s, (1-3*s*A+s)/s, (-s+1+s*A)/s,
        -1/2/s*(-4-3*s*A+3*s), -1/2/s*(-3*s+9*s*A-2), -1/2/s*(-9*s*A+4+3*s),
-1/2/s*(-3*s+2+3*s*A),
        -1/s, 0, 1/s, 0,
        1/2-1/2*A, A, 1/2-1/2*A, 0>
}

This code needs my bicubic interpolation patch to work.

Lutz-Peter

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