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File:Multi-walled Carbon Nanotube.png

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Summary

Description
English: A multi-walled armchair carbon nanotube, rendered in POVRay
Date
Source Own work
Author Eric Wieser
//+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
}

Licensing

I, the copyright holder of this work, hereby publish it under the following license:
w:en:Creative Commons
attribution share alike
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.

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depicts

27 December 2010

File history

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Date/TimeThumbnailDimensionsUserComment
current19:51, 20 July 2019Thumbnail for version as of 19:51, 20 July 20191,200 × 900 (778 KB)User-duckCropped to center and enlarge using CropTool with precise mode.
21:45, 15 May 2016Thumbnail for version as of 21:45, 15 May 20161,920 × 1,080 (799 KB)Eric WieserRe-render at 1080p
15:14, 21 April 2011Thumbnail for version as of 15:14, 21 April 2011640 × 480 (176 KB)Eric WieserLarger render, smaller bonds and atoms for clearer view
15:20, 27 December 2010Thumbnail for version as of 15:20, 27 December 2010512 × 384 (123 KB)Eric Wieser

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