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Code Issues 145 Wiki Activity

fix(track): what the review of unevenness found in the engine

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- A path of no length gave a joint with a vector across of NaN to the path
  joined to it, on any scenery, with unevenness or not. It now has no
  vector across, and so makes no joint.
- Axles no longer stray along the track. It moved vehicles against each
  other, changing the distance their couplers go by.
- The bend under an axle goes straight on past the ends of a path: the
  polynomial ran off on a short curved one, with a kick in the cab shake.
- A track left out of its rail run, where tracks are joined one way only,
  no longer walks the whole run again on every call.
- The clatter of an axle goes by the outer axle on its side of the vehicle,
  and not always by the same one, as the two can be on different tracks.
- A vertex works out the amounts once, and the foot of the ballast not at all.
This commit is contained in:
maj00r
2026-10-31 19:02:55 +01:00
parent ec2d226688
commit 371de52342
6 changed files with 105 additions and 25 deletions
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45
world/Segment.cpp
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@@ -385,13 +385,12 @@ void TSegment::RaPositionGet(double const fDistance, glm::dvec3 &position, glm::
rotation.x += static_cast<float>( track_uneven::stray_per_mm * (
amount.up * track_uneven::roll( position, across, gauge )
+ amount.cross * track_uneven::level( position, across ) / gauge ) );
position += stray( position, fDistance );
position += track_uneven::across_only( stray( position, amount, fDistance ), across );
}
glm::dvec3 TSegment::stray( glm::dvec3 const &Point, double const Distance ) const {
auto const amount { pOwner->uneven_at( Distance, m_path ) };
glm::dvec3 TSegment::stray( glm::dvec3 const &Point, track_uneven::amounts const &Amount, double const Distance ) const {
auto const field { track_uneven::field( Point ) };
glm::dvec3 result { field.x * amount.side, field.y * amount.up, field.z * amount.side };
glm::dvec3 result { field.x * Amount.side, field.y * Amount.up, field.z * Amount.side };
result *= track_uneven::stray_per_mm;
result.y -= pOwner->joint_dip( Distance );
return result;
@@ -401,13 +400,25 @@ glm::dvec3 TSegment::uneven_bend( double const Distance ) const {
if( false == m_uneven ) {
return glm::dvec3 { 0.0 };
}
// over about a bogie; FastGetTFromS extrapolates past the ends of the path
// over about a bogie
auto const reach { 1.5 };
auto const strayed = [&]( double const At ) {
return stray( FastGetPoint( FastGetTFromS( At ) ), At ); };
return stray( point_extended( At ), pOwner->uneven_at( At, m_path ), At ); };
return ( strayed( Distance + reach ) - 2.0 * strayed( Distance ) + strayed( Distance - reach ) ) / ( reach * reach );
}
glm::dvec3 TSegment::point_extended( double const Distance ) const {
auto const on { std::clamp( Distance, 0.0, fLength ) };
auto const t { FastGetTFromS( on ) };
auto const point { FastGetPoint( t ) };
if( on == Distance ) {
return point;
}
auto const direction { FastGetDirection( t, 0.1 / fLength ) };
auto const size { glm::length( direction ) };
return size > 0.0 ? point + direction * ( ( Distance - on ) / size ) : point;
}
void TSegment::settle_vertex( gfx::basic_vertex &Vertex, glm::dvec3 const &Origin, glm::vec3 const &Position, glm::vec3 const &Parallel, double const Distance ) const {
if( false == m_uneven ) {
return;
@@ -416,8 +427,12 @@ void TSegment::settle_vertex( gfx::basic_vertex &Vertex, glm::dvec3 const &Origi
auto const gauge { std::max( std::abs( pOwner->fTrackWidth ), 0.1f ) };
auto const across { std::clamp( glm::dot( Vertex.position - Position, Parallel ), -0.5f * gauge, 0.5f * gauge ) };
auto const share { pOwner->uneven_bed_share( Position.y - Vertex.position.y ) };
Vertex.position.y -= static_cast<float>( share * track_uneven::stray_per_mm * pOwner->uneven_at( Distance, m_path ).cross * track_uneven::level( Origin + glm::dvec3 { Position }, glm::dvec3 { Parallel } ) * across / gauge );
Vertex.position += glm::vec3 { share * stray( Origin + glm::dvec3 { Vertex.position }, Distance ) };
if( share <= 0.0 ) {
return;
}
auto const amount { pOwner->uneven_at( Distance, m_path ) };
Vertex.position.y -= static_cast<float>( share * track_uneven::stray_per_mm * amount.cross * track_uneven::level( Origin + glm::dvec3 { Position }, glm::dvec3 { Parallel } ) * across / gauge );
Vertex.position += glm::vec3 { share * stray( Origin + glm::dvec3 { Vertex.position }, amount, Distance ) };
}
void TSegment::design_position(double const fDistance, glm::dvec3 &position, glm::vec3 &rotation) const {
@@ -446,15 +461,15 @@ void TSegment::design_position(double const fDistance, glm::dvec3 &position, glm
};
void TSegment::plan_frame( double const Distance, glm::dvec3 &Point, glm::dvec3 &Across ) const {
if( fTsBuffer.empty() ) {
// never made into a path: tt_Cross and the like
Point = Point1;
Across = glm::dvec3 { 0.0 };
return;
}
auto const t { FastGetTFromS( std::clamp( Distance, 0.0, fLength ) ) };
Point = FastGetPoint( t );
auto const dir { FastGetDirection( t, 0.1 / fLength ) };
Across = glm::dvec3{ -dir.z, 0.0, dir.x };
if( glm::length2( Across ) == 0.0 ) {
auto const chord { FastGetPoint_1() - FastGetPoint_0() };
Across = glm::dvec3{ -chord.z, 0.0, chord.x };
}
Across = glm::normalize( Across );
Across = track_uneven::across_of( FastGetDirection( t, 0.1 / fLength ), FastGetPoint_1() - FastGetPoint_0() );
}
glm::dvec3 TSegment::FastGetPoint(double const t) const