Generates a Hex Pattern

HexGenerator.nk

set cut_paste_input [stack 0]
version 5.2 v1
Group {
 inputs 0
 name HexGenerator
 selected true
 xpos -50
 ypos -482
 addUserKnob {20 HexGenerator}
 addUserKnob {41 format T HexGenCalc.format}
 addUserKnob {26 ""}
 addUserKnob {7 size R 10 400}
 size 180
 addUserKnob {7 sharpness}
 sharpness 1
 addUserKnob {7 thickness R 0 0.2}
 thickness 0.011
 addUserKnob {6 invert +STARTLINE}
}
 BlinkScript {
  inputs 0
  recompileCount 6
  ProgramGroup 1
  KernelDescription "2 \"HexKernel\" iterate pixelWise 1e7192b9cc9235ac98937c42230792ead33a4d63b46d36793e9ff1a13ff9b6d0 1 \"dst\" Write Point 3 \"size\" Float 1 AAAgQQ== \"smoothness\" Float 1 AACAPw== \"thickness\" Float 1 CtcjPA== 3 \"size\" 1 1 \"smoothness\" 1 1 \"thickness\" 1 1 0"
  kernelSource "kernel HexKernel : ImageComputationKernel<ePixelWise>\n\{\n  Image<eWrite> dst;\n\n  param:\n    float size;\n    float smoothness;\n    float thickness;\n\n  void define() \{\n    defineParam(size, \"size\", 10.0f);\n    defineParam(smoothness, \"smoothness\", 1.0f);\n    defineParam(thickness, \"thickness\", 0.01f);\n  \}\n\n  float2 mod(float2 v, float m) \{\n    return float2( fmod(v.x, m), fmod(v.y, m) );\n  \}\n\n  float hexGrid(float2 p) \{\n    p.x *= 2.0f*0.57735f;\n    p.y += fmod(floor(p.x), 2.0f)*0.5f;\n    p = fabs(mod(p, 1.0f) - 0.5f);\n    return fabs(max(p.x*1.5f+p.y, p.y*2.0f)-1.0f);\n  \}\n\n  float smoothstep(float a, float b, float x) \{\n    if (x < a)\n      return 0.0f;\n    if (x >= b)\n      return 1.0f;\n    x = (x - a) / (b - a);\n    return x*x * (3.0f - 2.0f*x);\n  \}\n\n  void process(int2 xy) \{\n    float2 pos = float2(float(xy.x)/size, float(xy.y)/size);\n    float v = hexGrid(pos);\n    v = smoothstep(thickness, thickness+smoothness, v);\n    dst() = float4(1-v, 1-v, 1-v, 1.0f);\n  \}\n\};"
  rebuild ""
  HexKernel_size {{parent.size}}
  HexKernel_smoothness {{1-parent.sharpness+0.01}}
  HexKernel_thickness {{parent.thickness}}
  rebuild_finalise ""
  name HexGenCalc
  xpos 120
  ypos 345
 }
 Invert {
  channels rgb
  name Invert
  xpos 120
  ypos 423
  disable {{!parent.invert}}
 }
 Output {
  name Output
  xpos 120
  ypos 495
 }
end_group