Descriptions and Examples for the POV-Ray Raytracer by Friedrich A. Lohmüller
    Model Railroading / Railway Modelling with POV-Ray -
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- POV-Ray Tutorial

  Model Railroading
  Railway Modelling
  with POV-Ray
    Index of Content

  - Rail Track System
    for POV-Ray
    Basic Track Elements
    - Straight & Curved
    - Switches
    - Wye + 3Ways
    - Level Junctions

    - Simplified Using by
      - Rail Tracks Elements

    - Track Layout with
      Model Scaled Tracks
      - H0 Scale Tracks
      - N Scale Tracks
      - Z Scale Tracks

   > Track Layout with
      scaled Tracks
      - Track Placement
      - Tracks Up & Down

    - Track Layout Examples
      - Simple cyclic
      - Simple eight

    - Download of the
      Rail Track System

Track Layout Technics with scaled Tracks

Demonstration with N scale track system of geometry type A:
Click here for download of the basic scene file RT_N_A111_BaseScene_0.pov for POV-Ray.
#include ""
#declare Simulate_On =  0 ;  // -2, -1, 0, 1, 2, 3,
//  0=real tracks, 1=double rails, 2=symbolic blocks, 3=blocks+text
// -2=with gravel, -1 with base blocks (h = 0.20)
#include "RT_System/N_TypeA111/"
#include "RT_System/N_TypeA111/"
// #declare N = 160; declared in set!

The placement of curve track by the macro 'Rotate_Around_Trans' needs: #include "" !

The first include file contains all macros for a track set in N scale.
The linear base legth is the track called object{T_111}
with a real length of 111mm, here represented with a length of L111 = 0.111*N.
The switches / turnouts have an angle of 15 degrees and a curved track of radius R9 (~0.42887*N).
It declares also the variables 'N' (=160) and the 'Track_Distance' (~ 0.029 m *160)
The simulation type should be declared befor including the track set!
All tracks are starting at <0,0,0> in positive x direction.

The second include file contains a macro 'Track_Up_00("TRACKNAME", STEP, GRADIENT_TYPE)'.
This is prepared for easy simulating gradients in tracks up and down as demonstrated later here.

Available Track Elements

1) Straight Tracks
The standard straight track length is 'L111' (= 0.111 m *160),
the according track is 'object{T_111}'.
object{ T_222 rotate<0,0,0> translate<0*L222,0,0>}
object{ T_115 rotate<0,0,0> translate<0*L111,0,0>}
object{ T_111 rotate<0,0,0> translate<0*L111,0,0>}
object{ T_107 rotate<0,0,0> translate<0*L107,0,0>}
object{ T_057 rotate<0,0,0> translate<0*L057,0,0>}
object{ T_055 rotate<0,0,0> translate<0*L055,0,0>}
object{ T_028 rotate<0,0,0> translate<0*L028,0,0>}
object{ T_777 rotate<0,0,0> translate<0*L777,0,0>}
// lenght free:
object{ T_Straight(0.331*N) translate<0.331*N,0,0>}
Straight Tracks
2) Curve Tracks
There is a big bunch of curves with the radii between R1 (~ 0.195 m * N) over R9 ( ~ 0.429 m * N = switch radius) to R10 ( ~ 0.468 m * N ) to keep the layout as flexible as possible.
Producers of model tracks don't produce all these radii - so it's up to you to select the according radii. Other radii can be realisized by flexible tracks.
For easier design of layouts there are also defined curves to the right i.e. 'object{T_R1_45}' and curves to the left i.e. 'object{T_R1_45}'
object{ T_R1_45
object{ T_R2_45
object{ T_R3_45
 // ... etc, etc, ... //
object{ T_R9_45
object{ T_R10_45

object{ T_R1_30
object{ T_R2_30
 // ...
object{ T_R1_15
 // ...
object{ T_R1_075
// radius and angle free:
object{ T_Curve( 0.250*N, 17.5 )
Note: Because of preview with track names we should avoid any mirroring
of curves, switches etc., otherwise with mode 'Simulate_On = 3'
we will see only mirrored textes!
This means: Don't use 'scale<-1,1,1>' or 'scale<1,1,-1>
pacement of a curve for a switch
Curve tracks T_L1_45, T_L2_45, ..., T_L10_45
pacement of a curve for a switch
Curve tracks T_R1_45, T_R2_45, ..., T_R10_45

3) Turnouts / Switches
and Level Junctions / Diamond Crossings

For turnouts / switches we need to declare the according switch direction.
Turnouts / switches: angle 15°, radius R9, straight length L111
The level junctions / diamond crossings are available
Asymmetrical: 15° (X15_RL, X15_LR: main L111, diagonal L115)
Symmetrical: 30° (XX30: length L115, XX30s: lenght ~ 0.05 m*N).
//switch directions: ----------------------------//
#declare SD1= 0;// 0=straight, 2=curved
#declare SD2= 0;//-1=left, 0=straight, 2=right
#declare SD3= 0;//-1=left, 1=right
// turnouts - switches
object{ SW_R(SD1) rotate<0,0,0> translate<0*L111,0,0>}
object{ SW_L(SD1) rotate<0,0,0> translate<0*L111,0,0>}
object{ SW3(SD2)  rotate<0,0,0> translate<0*L111,0,0>}
object{ SWY(SD3)  rotate<0,0,0> translate<0*L111,0,0>}
// level junctions - diamond crossings
object{ X15_RL    rotate<0,0,0> translate<0*L110,0,0>}
object{ X15_LR    rotate<0,0,0> translate<0*L110,0,0>}
object{ X30    rotate<0,0*15,0> translate<0*L115,0,0>}
object{ X30s   rotate<0,0*15,0> translate<0*L115,0,0>}

Turnouts and Level Junctions
Turnouts / Switches and
Level Junctions / Diamond Crossings

4) Improvised Double Slip
object{ XX_RL  rotate<0,0,0> translate<0*L110,0,0>}
object{ XX_LR  rotate<0,0,0> translate<0*L110,0,0>}
Note: These double slips are only available in improvised versions - no switch directions to choose!

Improvised Double Slip
Improvised Double Slip

5) Improvised Curve Switch Sets
object{ CSW12_R rotate<0,0,0>
object{ CSW21_R rotate<0,0,0>

object{ CSW12_L rotate<0,0,0>
object{ CSW21_L rotate<0,0,0>

Note: These curve switches are only available in improvised versions - no switch directions to choose!

Improvised Curve Switch Sets
Improvised Curve Switch Sets
CSW21_R, CSW12_R, CSW12_L, CSW21_L


© Friedrich A. Lohmueller, 2011