Ficheiro:Tackle principle.png
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Descrição do ficheiro
DescriçãoTackle principle.png |
Shows the principle, forces and traveling distances in a basic tackle. Rendered using POV-Ray (see http://www.povray.org/) and the scene description code shown below. This image comes complete with annotations; letters, numbers and arrows. Because of this, rendering this image with POV-Ray requires the free TrueType fonts "cmr10.ttf" (Computer Modern Roman) and "cmmi10.ttf" (Computer Modern italics) either in the same directory as the .pov or installed globally on the computer. The scene description assumes that the image is four times as tall as it is wide! When rendering, remember to specify the width and height of the rendering accordingly. |
Data | 15 de abril de 2005 (data de carregamento original) |
Origem | A fonte não foi fornecida de forma legível por computadores. Presume-se que seja obra própria (com base nos direitos de autor reivindicados). |
Autor | O autor não foi fornecido de forma legível por computadores. Presume-se que seja Peo~commonswiki (com base nos direitos de autor reivindicados). |
Licenciamento
É concedida permissão para copiar, distribuir e/ou modificar este documento nos termos da Licença de Documentação Livre GNU, versão 1.2 ou qualquer versão posterior publicada pela Free Software Foundation; sem Secções Invariantes, sem textos de Capa e sem textos de Contra-Capa. É incluída uma cópia da licença na secção intitulada GNU Free Documentation License.http://www.gnu.org/copyleft/fdl.htmlGFDLGNU Free Documentation Licensetruetrue |
A utilização deste ficheiro é regulada nos termos da licença Creative Commons - Atribuição-CompartilhaIgual 3.0 Não Adaptada. | ||
| ||
Esta marca de licenciamento foi adicionada a este ficheiro durante a atualização da licença GFDL.http://creativecommons.org/licenses/by-sa/3.0/CC BY-SA 3.0Creative Commons Attribution-Share Alike 3.0truetrue |
POV-Ray scene description for this image:
/*
================================================
Demonstrating the principle of the basic tackle
------------------------------------------------
Created by Søren Peo Pedersen - see my user page
et http://da.wikipedia.org/wiki/Bruger:Peo
================================================
*/
#macro WoodTxt(WhiteOut) // Wood texture with specified
pigment { // degree of "whiting out"
wood
color_map {
[0 color rgbt <.9+.1*WhiteOut,.7+.3*WhiteOut,.5+.5*WhiteOut>]
[1 color rgbt <.7+.3*WhiteOut,.5+.5*WhiteOut,.4+.6*WhiteOut>]
}
scale .1
turbulence .05
translate <2,0,-1>
}
finish {ambient .4+.3*WhiteOut}
#end
#macro RopeTxt(WhiteOut) // Texture for ropes, with specified "whiting out"
pigment {color rgb <1+.0*WhiteOut,.9+.1*WhiteOut,.6+.4*WhiteOut>}
finish {ambient .4+.3*WhiteOut}
#end
#macro Tackle(WhiteOut) // Renders the tackle, weight and parts of the rope
#local WheelSideCut=difference {
cone {<0,0,.03>,.35,<0,0,.13>,.45}
cone {<0,0,.3>,0,<0,0,-.3>,.6}
}
#local MetalTxt=texture { // Metal texture for hooks and weight
pigment {color rgb .5+WhiteOut/4}
finish {
ambient .4+.2*WhiteOut
reflection rgb .3
metallic
}
}
merge {
difference {
box {<-.45,-1,-.3>,<.45,.5,.3>} // "body" of tackle
box {<-1,-.5,-.1>,<1,1,.1>} // The "gap" for the wheel
plane {<3,-1,0>,-.3} // Left "slanted" side
plane {<-3,-1,0>,-.3} // Right "slanted" side
texture {WoodTxt(WhiteOut) rotate <90,0,0>}
}
difference { // Wheel in the tackle
cylinder {<0,0,-.09>,<0,0,.09>,.5} // "Body" of the wheel
torus {.5,.07 rotate <90,0,0>} // Groove for the rope
#object {WheelSideCut} // Cut-aways on both
#object {WheelSideCut scale <1,1,-1>} // sides of the wheel
texture {MetalTxt}
translate <0,.25,0>
}
cylinder {<0,.25,-.4>,<0,.25,.4>,.1 // Axle through
texture {MetalTxt} // wheel and tackle
}
sphere_sweep {b_spline,7 // Hook on the tackle
< 0,-0.7,0>,.1
< 0,-1 ,0>,.1
< 0,-1.2,0>,.1
< .3,-1.5,0>,.09
< 0,-1.8,0>,.08
<-.3,-1.5,0>,.06
<-.3,-1.2,0>,.04
texture {MetalTxt}
}
merge { // Weight attached to the hook
difference { // Round part of attachment ring
torus {.2,.1 rotate <0,0,90>}
plane {<0,1,0>,0}
translate <0,-1.75,0>
}
cylinder {<0,-1.75,-.2>,<0,-1.85,-.2>,.1} // Straight parts of
cylinder {<0,-1.75, .2>,<0,-1.85, .2>,.1} // attachment ring
cone {<0,-1.85,0>,.4,<0,-2.8,0>,.6} // "Body" of the waight
texture {MetalTxt}
}
merge { // Rope around the wheel in the tacle
difference {
torus {.5,.07 rotate <90,0,0>}
plane {<0,-1,0>,0}
}
cylinder {<.5,0,0>, // Straight part of rope on right side of wheel
<.5,#if (WhiteOut=0) 1 #else 6 #end,0>,.07
}
translate <0,.25,0>
texture {RopeTxt(WhiteOut)}
}
cylinder { // Free end of rope on left side of the wheel
<-.5,.25,0>,<-.5,#if (WhiteOut=0) 7 #else 1 #end,0>,.07
texture {RopeTxt(WhiteOut)}
}
union { // Free end of the rope with the hook with ring attached:
merge { // Knot and loop at the free end of the rope:
#local Count=0; // The knot
#while (Count<5)
torus {.1,.07 translate <-.5,1.45-.14*Count,0>}
#local Count=Count+1;
#end
difference { // Part of rope loop bent around the hook
torus {.15,.07}
box {<-1,-1,0>,<0,1,1> rotate <0,-30,0>}
box {-1,<0,1,0> rotate <0,30,0>}
rotate <0,0,90>
translate <-.5,1.8,0>
}
cylinder { // Straight part of rope loop, away from viewer
<0,0,.15>,<0,-.4,.15>,.07
rotate <30,0,0> translate <-.5,1.8,0>
}
cylinder { // Straight part of rope loop, towards viewer
<0,0,-.15>,<0,-.4,-.15>,.07
rotate <-30,0,0> translate <-.5,1.8,0>
}
texture {RopeTxt(WhiteOut)}
}
merge { // Hook with ring at the free end of the rope
sphere_sweep {b_spline,7 // The hook itself
<-.5,2.8,0>,.1
<-.5,2.5,0>,.1
<-.5,2.3,0>,.1
<-.2,2 ,0>,.09
<-.5,1.7,0>,.08
<-.8,2 ,0>,.06
<-.8,2.3,0>,.04
}
torus {.2,.1 rotate <90,0,0> translate <-.5,2.72,0>} // The ring on the hook
texture {MetalTxt}
}
#if (WhiteOut=0) // Using WhiteOut property to specify the length of the
translate <0,6,0> // free end of the rope, and hence the knot and hook
#end
}
}
#end
#macro LengthArrow (Length,NameSymbol) // Double arrow with symbol for indicating lengths
#local ArrowHead=difference {
box {<-1,-1,-.001>,<0,0,.001> rotate <0,0,45> scale <1,3,1>}
plane {<0,1,0>,-.5}
}
merge {
box {<-.5,-.01,-.001>,<.5,.01,.001>}
#object {ArrowHead scale <1,-1,1> translate <0,.01,0>}
box {<-.01,.51,-.01>,<.01,Length-.51,.001>}
#object {ArrowHead translate <0,Length-.01,0>}
box {<-.5,Length-.01,-.001>,<.5,Length+.01,.001>}
#object {NameSymbol
translate <0,
Length/2+(min_extent(NameSymbol).y-max_extent(NameSymbol).y)/2
,0>
}
pigment {color rgb 0}
no_shadow
no_reflection
}
#end
#macro ForceArrow (Length,NameSymbol) // Fat arrow with symbol for indicating forces
merge {
difference {
box {<-1,-1,-.001>,<0,0,.001> rotate <0,0,45> scale <1,2,1>}
plane {<0,1,0>,-.5}
translate <0,Length,0>
}
box {<-.1,0,-.01>,<.1,Length-.5,.01>}
#object {NameSymbol
translate <0,
Length/2+(min_extent(NameSymbol).y-max_extent(NameSymbol).y)/2
,0>
}
pigment {color rgb 0}
no_shadow
no_reflection
}
#end
// The scenario:
box {<.3,2,-1000>,<.7,3,1000> texture {WoodTxt(0)}} // Wooden beam
merge { // End of rope tied around the wooden beam:
cylinder {<.77,3,0>,<.77,2,0>,.07} // Down the far side of the beam
intersection { // Around farthest, upper corner on beam
torus {.07,.07}
box {<0,-1,-1>,<1,1,0>}
rotate <90,0,0>
translate <.7,3,0>
}
cylinder {<.3,3.07,0>,<.7,3.07,0>,.07} // Horizontal part above beam
intersection { // Around the nearest, upper corner on beam
torus {.07,.07}
box {-1,<0,1,0>}
rotate <90,0,0>
translate <.3,3,0>
}
cylinder {<.23,3,0>,<.23,2,0>,.07} // Down the near side of the beam
difference { // Around the nearest, lower corner on beam
torus {.07,.07}
plane {<0,0,1>,0}
plane {<0,0,-1>,0 rotate <0,25,0>}
rotate <90,0,0>
translate <.3,2,0>
}
cylinder {<-.07,0,0>,<-.07,-.7,0>,.07 // From nearest lower corner on
rotate <0,0,25> translate <.3,2,0> // the beam down to the knot
}
cylinder {<.07,0,0>,<.07,-.7,0>,.07 // From farthest lower corner on
rotate <0,0,-25> translate <.7,2,0> // the beam down to the knot
}
#local Count=0; // The knot just underneath the wooden beam
#while (Count<5)
torus {.1,.07 translate <.5,1.45-.14*Count,0>}
#local Count=Count+1;
#end
texture {RopeTxt(0)}
}
#object {Tackle(0)} // Tackle in upper position, at full "color density"
#object {Tackle(.7) translate <0,-6,0>} // "Whited-out" tackle at lower position
#object {LengthArrow(6, // Indicating the length "s" the weight travels
text {ttf "cmmi10.ttf"
"s",.001,0 translate <.1,0,0>}
) translate <1.2,-8.3,0>}
#object {LengthArrow(12, // Indicating the length "2s" the hook travels
union {
text {ttf "cmr10.ttf"
"2",.001,0 translate <-.95,0,0>}
text {ttf "cmmi10.ttf"
"s",.001,0 translate <-.45,0,0>}
}
) translate <-1.4,-3.28,0>}
#object {ForceArrow(4, // Indicating the lifting force "F" on the weight
text {ttf "cmmi10.ttf"
"F",.001,0 translate <-.85,0,0>}
)
translate <-1,-8.8,0>
}
#object {ForceArrow(2, // Indicating the force "F/2" excerted on the rope end
union {
text {ttf "cmmi10.ttf"
"F",.001,0 translate <.3,.9,0>}
box {<.2,.70,0>,<1.1,.74,.001>}
text {ttf "cmr10.ttf"
"2",.001,0 translate <.4,-.1,0>}
}
)
translate <.3,7,0>
}
// background {color rgb 1} // Provides the white backdrop
camera { // Camera: Indicates where the scenario is
up <0,1,0> // seen from, and where the viewer "looks"
right <.25,0,0>
location <-5,5,-30>
look_at <-.3,.37,0>
angle 8.4
}
light_source {<-1000,2500,-2000> color rgb 1} // Illumination
Elementos retratados neste ficheiro
retrata
15 abril 2005
Histórico do ficheiro
Clique uma data e hora para ver o ficheiro tal como ele se encontrava nessa altura.
Data e hora | Miniatura | Dimensões | Utilizador | Comentário | |
---|---|---|---|---|---|
atual | 20h38min de 5 de agosto de 2012 | 1 000 × 4 000 (657 kB) | Morn | transparent background | |
21h37min de 4 de agosto de 2012 | 1 000 × 4 000 (614 kB) | Morn | redone at higher resolution and with Computer Modern TTF fonts | ||
22h15min de 15 de abril de 2005 | 250 × 1 000 (77 kB) | Peo~commonswiki | Shows the principle, forces and travelling distances in a basic tackle. Rendered using POV-Ray (see heep://www.povray.org/) and the scene description code shown below. This image comes complete with annotations; lettes, numbers and arrows. Because of thi |
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