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Code Issues 156 Wiki Activity

feat(track): track unevenness declared in the track entry

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Usage, optional attributes of a track entry, before endtrack:

  uneven <mm>       peak deviation of a rail on a 10 m chord, 0-100; normal and switch
  unevenup <mm>     up and down alone, instead of uneven; normal and switch
  unevenside <mm>   sideways alone, instead of uneven; normal and switch
  unevencross <mm>  cross level alone, instead of uneven; normal only
  jointdip <mm>     depth of the dip at rail joints, every sound distance; normal only,
                    default 0.4 of the up and down component

Values of uneven follow PLK Id-14 appendix 1: 6 mm is the limit at 160 km/h, 10 at 120,
18 at 80, 35 at 40; half of it for a track in a good state. Example:

  uneven 18
  unevencross 25
  jointdip 6
  endtrack

The same fields are in the editor, track panel, section Ride and sound. See
track_uneven_doc.md.

The unevenness is a displacement field over the plan of the scenery, with no random
numbers: one place strays the same every time, and joined tracks, the paths of a switch,
sleepermodel and axles at one place move together. Tracks meet at a joint at the lower of
their values. Joined switches take the lowest of theirs, the tracks joined to them come to
it, and a track with none of a component keeps the switch to its design in it. The clatter
comes from the dipping joints. Curve radius and grade for the physics stay as designed.

Tracks with it get geometry every 2 m on straights: 4x the vertices on Baltyk with all
tracks flagged, 0.2 ms more per frame on td.scn.
This commit is contained in:
maj00r
2026-10-31 15:47:10 +01:00
parent 66a940d4f5
commit e5266e1e6b
15 changed files with 774 additions and 4 deletions
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14
world/Segment.h
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@@ -47,6 +47,7 @@ class TSegment
glm::dvec3 Point2;
float fRoll1 { 0.f };
float fRoll2 { 0.f }; // przechyłka na końcach
bool m_uneven { false }; // see TrackUneven.h
double fLength { -1.0 }; // długość policzona
std::vector<double> fTsBuffer; // wartości parametru krzywej t dla równych odcinków s
std::vector<double> fTsSlope; // nachylenie dt/du (= dt/ds * fStep) w tych samych punktach
@@ -67,6 +68,12 @@ class TSegment
glm::dvec3 RaInterpolate(double const t) const;
glm::dvec3 RaInterpolate0(double const t) const;
// moves a lofted vertex with the unevenness of the track
void settle_vertex( gfx::basic_vertex &Vertex, glm::dvec3 const &Origin, glm::vec3 const &Position, glm::vec3 const &Parallel, double const Distance ) const;
// displacement of a point by the unevenness, at a distance along the path
glm::dvec3 stray( glm::dvec3 const &Point, double const Distance ) const;
void design_position( double const fDistance, glm::dvec3 &position, glm::vec3 &rotation ) const;
public:
bool bCurve = false;
@@ -106,6 +113,13 @@ public:
/// <param name="position">Calculated position</param>
/// <param name="rotation">Calculated rotation</param>
void RaPositionGet(double const fDistance, glm::dvec3 &position, glm::vec3 &rotation) const;
// call before Init, it sets the density of the geometry
void
set_uneven( bool const Uneven ) {
m_uneven = Uneven; }
// second derivative of the displacement along the path; times speed squared: acceleration of an axle
glm::dvec3
uneven_bend( double const Distance ) const;
glm::dvec3 FastGetPoint(double const t) const;
inline
glm::dvec3