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Code Issues 157 Wiki Activity

feat(roads): junctions made by leading a road out of another, width and height set at road points

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Hirek
2026-10-03 21:20:00 +02:00
parent daeed40f15
commit 1d4c448e30
6 changed files with 1059 additions and 383 deletions
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9
world/Road.h
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@@ -47,7 +47,8 @@ class owned_shapes
scene::basic_section *m_section{nullptr};
};
// a piece of a road for wheeled traffic: an axis, and a cross-section which stays the same along it.
// a piece of a road for wheeled traffic: an axis, and a cross-section which stays the same along it, save for getting
// evenly wider or narrower if it's told to.
// the node itself is neither driven on nor drawn. it produces the lanes, which are ordinary invisible one-way tracks,
// and the surface, the sides and the markings, which are ordinary shapes. this way the vehicles, the ai and the renderers
// deal with a road without knowing about it.
@@ -100,6 +101,7 @@ class road_node : public scene::basic_node
float velocity{-1.f};
std::vector<lane_data> lanes;
std::vector<int> changes; // permissions to change the lane, one for each pair of neighbouring lanes
std::array<float, 2> taper{1.f, 1.f}; // what the widths of the lanes are multiplied by at the start and at the end of the axis
std::string surface{"asphaltdark1"};
float texturelength{4.f};
std::array<side_data, 2> sides; // left, right
@@ -121,8 +123,10 @@ class road_node : public scene::basic_node
int default_change(std::size_t const Boundary) const;
// distance of the middle of a lane from the axis, positive to the left when facing along the axis
double lane_offset(std::size_t const Lane) const;
// combined width of the lanes
// combined width of the lanes, before the taper
double width() const;
// what the widths of the lanes are multiplied by at specified value of the curve parameter
double scale(double const T) const;
// shape of the middle of a lane, laid out in the direction of travel
segment_data lane_path(std::size_t const Lane) const;
// length of the axis
@@ -206,6 +210,7 @@ class road_node : public scene::basic_node
// gets a legacy crossroads path, which is what the vehicles and their drivers already know how to pick a way through.
// scenery entry:
// node <max> <min> <name> junction <centre> arm <position> <direction x z> <lanes in> <lanes out> <lane width> ... [<property> <values>]... endjunction
// the arms don't have to be level with each other: the surface is spanned between their ends and the centre
class junction_node : public scene::basic_node
{