//+FN +UA#

#version 3.6;

#include "colors.inc"

global_settings {
    assumed_gamma 2.1
    ambient_light color rgb 1
}

// ----------------------------------------

camera {
    location  <1.35, 1.35, 1.35>
    direction 1.5*z
    right     x*image_width/image_height
    look_at   <0.0, 0.0, 0.0>
}

light_source {
    <0, 0, 20>
    color rgb <1, 1, 1>
    area_light
    x*10, y*10, 5, 5
     //jitter
    rotate -x*45
}

light_source {
    <20, 0, 0>
    color rgb <1, 1, 1>
    area_light
    z*10, y*10, 5, 5
    // jitter
}


#declare MODE_ARMCHAIR = 1;
#declare MODE_RIBBON = 2;
#declare MODE_ZIGZAG = 3;

#macro nanoTube(mode, ba, bb, atomColor)
    #local s = sqrt(3)/2;
    #local b1 = max(ba, bb);

    #switch(mode)
        #case(MODE_ARMCHAIR)
            #local bb = bb + 6;
            #local r = (bb - 6)/pi;

            #macro ab2Vector(b, a) <b, sin(a/r)*r, cos(a/r)*r>
            #end
        #break

        #case(MODE_RIBBON)
            #macro ab2Vector(a, b) <a, 0, b>
            #end
        #break

        #case(MODE_ZIGZAG)
            #local ba = ba + 2;
            #local r = (ba*s)/pi;

            #macro ab2Vector(a, b) <cos(a/r)*r, sin(a/r)*r, b>
            #end
        #break
    #end

    #macro atom(pos)
        sphere {
            pos, 0.2

            texture {
                pigment {
                    color rgb atomColor
                }
                finish{
                    specular 0.4
                }
            }
        }
    #end

    #macro bond(from, to)
        cylinder {
            from, to, 0.075

            texture {
                pigment {
                    color rgb atomColor*0.5 + 0.5
                }
                finish{
                    specular 0.6
                }
            }
        }
    #end

    union {
        #local m = -b1;
        #while (m < b1)
                #local n = -b1;
                #while (n < b1)
                #local a0 = (n*2 + m)*s;
                #local b0 = m*1.5;
                #if (abs(a0) < ba & abs(b0) < bb)
                    union{
                        #if (b0 > -bb + 2)
                            atom(ab2Vector(a0, b0))
                        #end
                        #if (abs(b0) < bb-2)
                            bond(ab2Vector(a0, b0), ab2Vector(a0, b0 + 1))
                        #end
                        #if (b0<bb-2)
                            atom(ab2Vector(a0, b0 + 1))
                            #if (a0 < ba-s)
                                    bond(ab2Vector(a0, b0 + 1), ab2Vector(a0 + s, b0 + 1.5))
                            #end
                            #if (a0 > s-ba)
                                    bond(ab2Vector(a0, b0 + 1), ab2Vector(a0-s, b0 + 1.5))
                            #end
                        #end
                    }
                #end
                #local n = n + 1;
            #end
            #local m = m + 1;
        #end
        scale 0.08
    }
#end

union {
    nanoTube(MODE_ARMCHAIR, 6, 12, <1, 0, 0>)
    nanoTube(MODE_ARMCHAIR, 9, 9, <0, 1, 0>)
    nanoTube(MODE_ARMCHAIR, 12, 6, <0, 0, 1> )
    rotate -clock*60*x
}

I, the copyright holder of this work, hereby publish it under the following license:

This file is licensed under the Creative Commons Attribution-Share Alike 3.0 Unported license.

You are free:

• to share – to copy, distribute and transmit the work
• to remix – to adapt the work

Under the following conditions:

• attribution – You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.
• share alike – If you remix, transform, or build upon the material, you must distribute your contributions under the same or compatible license as the original.

https://creativecommons.org/licenses/by-sa/3.0CC BY-SA 3.0 Creative Commons Attribution-Share Alike 3.0 truetrue