Sprint 4 — Full bridge scene (Girder×5 + DeckSlab + Bearing×10 + Abutment×2)
viewer/bridge_scene.rs: BridgeScene compositor - 5× PSC-I Girder (2500mm c/c) - DeckSlab (12000mm, 220mm thick, top of girders) - 10× Elastomeric Bearing (5 per abutment end) - 2× ReverseT Abutment (start & end) - sweep::merge_meshes로 단일 메시 합성 - scene_extents()로 카메라 자동 배치 Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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minsung
139
cimery/crates/viewer/src/bridge_scene.rs
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139
cimery/crates/viewer/src/bridge_scene.rs
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//! Full bridge scene compositor — Sprint 4.
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//!
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//! Builds a single merged mesh for a simple 40 m single-span PSC-I girder bridge:
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//! - 5 × PSC-I Girder (2500 mm c/c)
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//! - 1 × Deck Slab (12000 mm wide)
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//! - 10 × Elastomeric Bearing (5 per abutment)
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//! - 2 × Abutment (start & end)
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//!
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//! Positions are in the same coordinate space as the girder mesh:
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//! X = transverse (right = +), Y = vertical (up = +), Z = along span.
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use cimery_core::{AbutmentType, BearingType, MaterialGrade, SectionType};
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use cimery_ir::{
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AbutmentIR, BearingIR, DeckSlabIR, FeatureId, GirderIR,
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PscISectionParams, SectionParams, WingWallIR,
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};
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use cimery_kernel::{GeomKernel, KernelError, Mesh};
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// ─── Helpers ─────────────────────────────────────────────────────────────────
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fn translate(mut mesh: Mesh, dx: f32, dy: f32, dz: f32) -> Mesh {
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for v in &mut mesh.vertices {
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v[0] += dx;
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v[1] += dy;
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v[2] += dz;
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}
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mesh
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}
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fn merge(meshes: Vec<Mesh>) -> Mesh {
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cimery_kernel::sweep::merge_meshes(meshes)
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}
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// ─── Scene builder ────────────────────────────────────────────────────────────
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/// Build a complete bridge scene mesh using the provided kernel.
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pub fn build_bridge_scene<K: GeomKernel>(kernel: &K) -> Result<Mesh, KernelError> {
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const SPAN_M: f64 = 40.0;
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const SPAN_MM: f32 = 40_000.0;
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const N_GIRDERS: usize = 5;
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const SPACING: f32 = 2_500.0; // mm c/c
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const GIRDER_H: f32 = 1_800.0; // mm
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const BEARING_H: f32 = 60.0; // mm
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let mut parts: Vec<Mesh> = Vec::new();
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// ── Girders ────────────────────────────────────────────────────────────────
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for i in 0..N_GIRDERS {
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let x = (i as f32 - (N_GIRDERS as f32 - 1.0) * 0.5) * SPACING;
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let ir = GirderIR {
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id: FeatureId::new(),
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station_start: 0.0,
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station_end: SPAN_M,
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offset_from_alignment: x as f64,
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section_type: SectionType::PscI,
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section: SectionParams::PscI(PscISectionParams::kds_standard()),
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count: 1,
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spacing: 0.0,
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material: MaterialGrade::C50,
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};
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let mesh = kernel.girder_mesh(&ir)?;
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parts.push(translate(mesh, x, 0.0, 0.0));
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}
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// ── Deck Slab ──────────────────────────────────────────────────────────────
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// KDS: min 220 mm, width = (N-1)*spacing + 2 × cantilever
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let half_width = ((N_GIRDERS as f32 - 1.0) * SPACING) * 0.5 + 1_000.0; // 1 m cantilever
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let deck_ir = DeckSlabIR {
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id: FeatureId::new(),
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station_start: 0.0,
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station_end: SPAN_M,
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width_left: half_width as f64,
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width_right: half_width as f64,
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thickness: 220.0,
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haunch_depth: 0.0,
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cross_slope: 2.0,
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material: MaterialGrade::C40,
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};
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let deck_mesh = kernel.deck_slab_mesh(&deck_ir)?;
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// Slab Y=0 is its top face; place it so bottom aligns with girder top
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parts.push(translate(deck_mesh, 0.0, GIRDER_H + 220.0, 0.0));
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// ── Bearings ───────────────────────────────────────────────────────────────
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// 5 per abutment, one under each girder
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for &z in &[0.0_f32, SPAN_MM] {
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for i in 0..N_GIRDERS {
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let x = (i as f32 - (N_GIRDERS as f32 - 1.0) * 0.5) * SPACING;
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let bearing_ir = BearingIR {
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id: FeatureId::new(),
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station: if z < 1.0 { 0.0 } else { SPAN_M },
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bearing_type: BearingType::Elastomeric,
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plan_length: 350.0,
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plan_width: 450.0,
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total_height: BEARING_H as f64,
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capacity_vertical: 1_500.0,
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};
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let mesh = kernel.bearing_mesh(&bearing_ir)?;
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// Place bearing centred under each girder, top at Y=0 (girder soffit)
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parts.push(translate(mesh, x - 175.0, -BEARING_H, z - 225.0));
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}
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}
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// ── Abutments ──────────────────────────────────────────────────────────────
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let wing = WingWallIR { length: 5_000.0, height: 2_500.0, thickness: 500.0 };
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let total_w = (N_GIRDERS as f64 - 1.0) * SPACING as f64 + 3_000.0; // incl. overhangs
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for &(station, z) in &[(0.0f64, -800.0_f32), (SPAN_M, SPAN_MM)] {
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let abut_ir = AbutmentIR {
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id: FeatureId::new(),
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station,
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skew_angle: 0.0,
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abutment_type: AbutmentType::ReverseT,
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breast_wall_height: (GIRDER_H + BEARING_H) as f64,
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breast_wall_thickness: 800.0,
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breast_wall_width: total_w,
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footing_length: 4_000.0,
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footing_width: total_w + 1_000.0,
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footing_thickness: 1_000.0,
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wing_wall_left: wing.clone(),
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wing_wall_right: wing.clone(),
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material: MaterialGrade::C40,
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};
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let mesh = kernel.abutment_mesh(&abut_ir)?;
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// Place abutment: breast wall top at Y = -(BEARING_H)
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let y = -(BEARING_H + abut_ir.breast_wall_height as f32);
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parts.push(translate(mesh, -(total_w as f32) * 0.5, y, z));
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}
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Ok(merge(parts))
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}
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/// Bounding box of the full bridge scene (for camera setup).
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pub fn scene_extents() -> ([f32; 3], [f32; 3]) {
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const SPAN_MM: f32 = 40_000.0;
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const HALF_W: f32 = 6_500.0;
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const TOP_Y: f32 = 2_020.0; // top of slab
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const BOT_Y: f32 = -3_000.0; // footing bottom approx
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([-HALF_W, BOT_Y, -2_000.0], [HALF_W, TOP_Y, SPAN_MM + 2_000.0])
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}
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