/**
 * Main PBR rendering shader for IFC geometry.
 * Features: PBR lighting, section plane clipping, selection highlight,
 * glass fresnel, ACES tone mapping, screen-space edge enhancement.
 */
export declare const mainShaderSource = "\n        struct Uniforms {\n          viewProj: mat4x4<f32>,\n          model: mat4x4<f32>,\n          baseColor: vec4<f32>,\n          metallicRoughness: vec2<f32>, // x = metallic, y = roughness\n          _padding1: vec2<f32>,\n          sectionPlane: vec4<f32>,      // xyz = plane normal, w = plane distance\n          flags: vec4<u32>,             // x = isSelected, y = section/clip bits, z = edgeEnabled, w = edgeIntensityMilli\n          clipBoxMin: vec4<f32>,        // xyz = clip-box min corner (world), w = pad\n          clipBoxMax: vec4<f32>,        // xyz = clip-box max corner (world), w = pad\n          // Quantized-vertex dequantization (issue #1682 phase 6):\n          // xyz = lattice-aligned quantMin (batch-origin-relative), w = step.\n          // Only read by vs_main_quantized; zero elsewhere.\n          quantParams: vec4<f32>,\n        }\n        @binding(0) @group(0) var<uniform> uniforms: Uniforms;\n\n        // Global lighting environment \u2014 one buffer shared by every mesh in\n        // the pass (bound once per frame at group(1)). Field packing must\n        // match packEnvironmentUniforms() in environment.ts.\n        struct Environment {\n          sunDirection: vec3<f32>,      // unit vector TOWARD the sun\n          sunIntensity: f32,\n          sunColor: vec3<f32>,\n          ambientIntensity: f32,\n          skyColor: vec3<f32>,          // hemisphere-ambient sky tint\n          exposure: f32,\n          groundColor: vec3<f32>,       // hemisphere-ambient ground tint\n          fillIntensity: f32,\n          rimIntensity: f32,\n          _pad0: f32,\n          _pad1: f32,\n          _pad2: f32,\n        }\n        @binding(0) @group(1) var<uniform> env: Environment;\n\n        struct VertexInput {\n          @location(0) position: vec3<f32>,\n          @location(1) normal: vec3<f32>,\n          @location(2) entityId: u32,\n        }\n\n        struct VertexOutput {\n          @builtin(position) position: vec4<f32>,\n          @location(0) worldPos: vec3<f32>,\n          @location(1) normal: vec3<f32>,\n          @location(2) @interpolate(flat) entityId: u32,\n          @location(3) viewPos: vec3<f32>,  // For edge detection\n          // Per-draw albedo carried from the vertex stage so the fragment shader\n          // is shared by the flat path (vs_main writes uniforms.baseColor \u2014 the\n          // per-batch / overlay-override colour) AND the instanced path\n          // (vs_instanced writes the per-occurrence colour from the instance\n          // buffer). For the flat path this is identical to reading\n          // uniforms.baseColor directly (the value is constant across the draw).\n          @location(4) color: vec4<f32>,\n          // Per-occurrence selection flag for the instanced path (bit 0 = selected).\n          // vs_main writes 0 (the flat path selects via uniforms.flags.x instead);\n          // vs_instanced writes the per-instance flag from the instance buffer, so a\n          // single selected occurrence highlights without re-drawing.\n          @location(5) @interpolate(flat) instSelected: u32,\n        }\n\n        // Per-instance vertex-buffer inputs (slot 1, stepMode 'instance') used by\n        // vs_instanced. The mat4 arrives as four COLUMN vec4s (WGSL mat4x4 is\n        // column-major), matching composeInstanceMatrix's column-major output +\n        // the pipeline's slot-1 attribute offsets (0/16/32/48).\n        //\n        // Location namespaces: vertex-INPUT @location (this struct + VertexInput)\n        // and inter-stage @location (VertexOutput) are INDEPENDENT in WGSL, so\n        // InstanceInput.m1 @location(4) does NOT collide with VertexOutput.color\n        // @location(4) \u2014 exactly as VertexInput.entityId and VertexOutput.entityId\n        // already BOTH use @location(2). Within the INPUT namespace the per-vertex\n        // inputs (0..2) and per-instance inputs (3..8) stay distinct.\n        struct InstanceInput {\n          @location(3) m0: vec4<f32>,\n          @location(4) m1: vec4<f32>,\n          @location(5) m2: vec4<f32>,\n          @location(6) m3: vec4<f32>,\n          @location(7) instEntityId: u32,\n          @location(8) instColor: vec4<f32>,\n          @location(9) instSelected: u32,\n        }\n\n        // 12-byte quantized vertex (issue #1682 phase 6): uint16x4 (lattice\n        // position xyz + packed octahedral normal in w as (u8x << 8 | u8y))\n        // followed by the u32 entityId lane. Dequantization is BIT-EXACT for\n        // the 2^-10 lattice: quantMin and q*step are both (integer)\u00B72^-10,\n        // so coincident points across batches stay coincident (the shared-\n        // origin z-fight guarantee survives quantization).\n        struct QuantizedVertexInput {\n          @location(0) q: vec4<u32>,     // uint16x4: x, y, z, packedOct\n          @location(2) entityId: u32,\n        }\n\n        fn octDecodeN(packed: u32) -> vec3<f32> {\n          let ox = (f32((packed >> 8u) & 255u) / 255.0) * 2.0 - 1.0;\n          let oy = (f32(packed & 255u) / 255.0) * 2.0 - 1.0;\n          var n = vec3<f32>(ox, oy, 1.0 - abs(ox) - abs(oy));\n          if (n.z < 0.0) {\n            let tx = (1.0 - abs(oy)) * select(-1.0, 1.0, ox >= 0.0);\n            let ty = (1.0 - abs(ox)) * select(-1.0, 1.0, oy >= 0.0);\n            n = vec3<f32>(tx, ty, n.z);\n          }\n          return normalize(n);\n        }\n\n        // Shared flat-path vertex shading \u2014 vs_main and vs_main_quantized\n        // differ ONLY in how position/normal are sourced.\n        fn shadeFlatVertex(localPos: vec3<f32>, localNormal: vec3<f32>, entityId: u32) -> VertexOutput {\n          var output: VertexOutput;\n          let worldPos = uniforms.model * vec4<f32>(localPos, 1.0);\n          output.position = uniforms.viewProj * worldPos;\n          // Anti z-fighting depth nudge \u2014 see vs_main's comment.\n          let colorSalt = (entityId >> 24u) * 2654435761u;\n          let zHash = (((entityId & 0x00FFFFFFu) ^ colorSalt) * 2654435761u) & 255u;\n          output.position.z *= 1.0 + f32(zHash) * 1e-6;\n          output.worldPos = worldPos.xyz;\n          output.normal = normalize((uniforms.model * vec4<f32>(localNormal, 0.0)).xyz);\n          output.entityId = entityId;\n          output.color = uniforms.baseColor;\n          output.instSelected = 0u;\n          output.viewPos = (uniforms.viewProj * worldPos).xyz;\n          return output;\n        }\n\n        @vertex\n        fn vs_main_quantized(input: QuantizedVertexInput) -> VertexOutput {\n          let p = uniforms.quantParams.xyz\n            + vec3<f32>(f32(input.q.x), f32(input.q.y), f32(input.q.z)) * uniforms.quantParams.w;\n          return shadeFlatVertex(p, octDecodeN(input.q.w), input.entityId);\n        }\n\n        @vertex\n        fn vs_main(input: VertexInput, @builtin(instance_index) instanceIndex: u32) -> VertexOutput {\n          var output: VertexOutput;\n          let worldPos = uniforms.model * vec4<f32>(input.position, 1.0);\n          output.position = uniforms.viewProj * worldPos;\n          // Anti z-fighting: deterministic depth nudge.\n          // Knuth multiplicative hash spreads sequential IDs across 0-255 so\n          // coplanar faces from different entities always get distinct depths.\n          // Material-layer walls slice into one closed solid per layer, all\n          // sharing the PARENT wall's expressId, so adjacent layers' coincident\n          // interface caps would get the same entity nudge and z-fight into a\n          // flickering comb (\"see inside the wall\"). To separate them we fold in\n          // an 8-bit MATERIAL-COLOUR salt that mergeGeometry/interleaveTextured\n          // baked into the HIGH 8 bits of the entityId lane (low 24 = picking id,\n          // masked off by encodeId24). Crucially the salt comes from the mesh's\n          // OWN colour, NOT the per-draw baseColor uniform \u2014 so the base opaque\n          // pass and the lens/IDS/compare/4D OVERLAY pass (which redraws the same\n          // geometry with a DIFFERENT draw colour) compute the SAME nudge, and\n          // the overlay pipeline's depthCompare:'equal' matches instead of\n          // rejecting every fragment. At 1e-6 per step the max world-space offset\n          // is <3mm at 10m \u2014 invisible.\n          let colorSalt = (input.entityId >> 24u) * 2654435761u;\n          let zHash = (((input.entityId & 0x00FFFFFFu) ^ colorSalt) * 2654435761u) & 255u;\n          output.position.z *= 1.0 + f32(zHash) * 1e-6;\n          output.worldPos = worldPos.xyz;\n          output.normal = normalize((uniforms.model * vec4<f32>(input.normal, 0.0)).xyz);\n          output.entityId = input.entityId;\n          output.color = uniforms.baseColor;\n          output.instSelected = 0u;  // flat path selects via uniforms.flags.x\n          // Store view-space position for edge detection\n          output.viewPos = (uniforms.viewProj * worldPos).xyz;\n          return output;\n        }\n\n        // Instanced vertex entry \u2014 one template's geometry drawn once per\n        // occurrence. The per-instance mat4 already folds SWAP * rel_k * T(origin)\n        // (composed CPU-side, see instanced-render.ts), so it maps the template's\n        // LOCAL vertex straight to WebGL Y-up world space \u2014 no uniforms.model.\n        // rel_k and SWAP are rigid (no scale), so the same matrix transforms\n        // normals. entityId + colour come per-occurrence from the instance buffer.\n        @vertex\n        fn vs_instanced(input: VertexInput, inst: InstanceInput) -> VertexOutput {\n          var output: VertexOutput;\n          let instMat = mat4x4<f32>(inst.m0, inst.m1, inst.m2, inst.m3);\n          let worldPos = instMat * vec4<f32>(input.position, 1.0);\n          output.position = uniforms.viewProj * worldPos;\n          // Same per-entity depth nudge as vs_main. No colour salt here: the\n          // instanced path has no base-vs-overlay coincident redraw (yet), so the\n          // raw picking id is enough to separate coplanar entities.\n          let zHash = ((inst.instEntityId & 0x00FFFFFFu) * 2654435761u) & 255u;\n          output.position.z *= 1.0 + f32(zHash) * 1e-6;\n          output.worldPos = worldPos.xyz;\n          output.normal = normalize((instMat * vec4<f32>(input.normal, 0.0)).xyz);\n          output.entityId = inst.instEntityId;\n          output.color = inst.instColor;\n          output.instSelected = inst.instSelected;\n          output.viewPos = (uniforms.viewProj * worldPos).xyz;\n          return output;\n        }\n\n        // PBR helper functions\n        fn fresnelSchlick(cosTheta: f32, F0: vec3<f32>) -> vec3<f32> {\n          return F0 + (1.0 - F0) * pow(clamp(1.0 - cosTheta, 0.0, 1.0), 5.0);\n        }\n\n        fn distributionGGX(NdotH: f32, roughness: f32) -> f32 {\n          let a = roughness * roughness;\n          let a2 = a * a;\n          let NdotH2 = NdotH * NdotH;\n          let num = a2;\n          let denomBase = (NdotH2 * (a2 - 1.0) + 1.0);\n          let denom = 3.14159265 * denomBase * denomBase;\n          return num / max(denom, 0.0000001);\n        }\n\n        fn geometrySchlickGGX(NdotV: f32, roughness: f32) -> f32 {\n          let r = (roughness + 1.0);\n          let k = (r * r) / 8.0;\n          let num = NdotV;\n          let denom = NdotV * (1.0 - k) + k;\n          return num / max(denom, 0.0000001);\n        }\n\n        fn geometrySmith(NdotV: f32, NdotL: f32, roughness: f32) -> f32 {\n          let ggx2 = geometrySchlickGGX(NdotV, roughness);\n          let ggx1 = geometrySchlickGGX(NdotL, roughness);\n          return ggx1 * ggx2;\n        }\n\n        fn encodeId24(id: u32) -> vec4<f32> {\n          let r = f32((id >> 16u) & 255u) / 255.0;\n          let g = f32((id >> 8u) & 255u) / 255.0;\n          let b = f32(id & 255u) / 255.0;\n          return vec4<f32>(r, g, b, 1.0);\n        }\n\n        struct FragmentOutput {\n          @location(0) color: vec4<f32>,\n          @location(1) objectIdEncoded: vec4<f32>,\n        }\n\n        @fragment\n        fn fs_main(input: VertexOutput) -> FragmentOutput {\n          // Per-instance hide/isolate: bit 1 of the instance flags lane marks a hidden\n          // occurrence. Discard it so it neither draws nor writes depth (and the pick\n          // pass applies the same discard, so it isn't pickable). vs_main writes\n          // instSelected=0u for flat geometry, so this never affects the flat path.\n          if ((input.instSelected & 2u) != 0u) {\n            discard;\n          }\n          // Per-instance opacity routing (instanced passes only \u2014 flags.x bit 2). The\n          // opaque instanced pass draws fully-opaque (or selected) occurrences; the\n          // transparent instanced sub-pass (bit 3, alpha-blended) draws the rest. Discard\n          // the occurrences belonging to the OTHER pass so each is drawn exactly once.\n          // Lens-ghost / x-ray / compare write a low per-instance alpha into input.color.a.\n          if ((uniforms.flags.x & 4u) != 0u) {\n            let occOpaque = input.color.a >= 0.99 || (input.instSelected & 1u) != 0u;\n            let transparentPass = (uniforms.flags.x & 8u) != 0u;\n            if (transparentPass) {\n              if (occOpaque) { discard; }\n            } else {\n              if (!occOpaque) { discard; }\n            }\n          }\n          // Section plane clipping - discard fragments ABOVE the plane.\n          // flags.y packs two bits: bit 0 = enabled, bit 1 = flipped.\n          let sectionEnabled = (uniforms.flags.y & 1u) == 1u;\n          if (sectionEnabled) {\n            let planeNormal = uniforms.sectionPlane.xyz;\n            let planeDistance = uniforms.sectionPlane.w;\n            let flipped = (uniforms.flags.y & 2u) == 2u;\n            let side = select(1.0, -1.0, flipped);\n            let distToPlane = (dot(input.worldPos, planeNormal) - planeDistance) * side;\n            if (distToPlane > 0.0) {\n              discard;\n            }\n          }\n          // Clip box (section / crop box): discard fragments OUTSIDE the AABB.\n          // flags.y bit 2 = clip-box enabled.\n          if ((uniforms.flags.y & 4u) != 0u) {\n            let p = input.worldPos;\n            if (any(p < uniforms.clipBoxMin.xyz) || any(p > uniforms.clipBoxMax.xyz)) {\n              discard;\n            }\n          }\n\n          // Compute normal via derivative-based flat shading.\n          //\n          // Industry-standard solution for BIM/CAD viewers \u2014 what\n          // Three.js (material.flatShading = true), Autodesk Forge,\n          // Speckle, and xeokit all do for opaque surfaces. Rationale:\n          //\n          //   * BIM geometry is overwhelmingly flat surfaces (walls,\n          //     slabs, roofs, beams), and CSG operations (opening\n          //     subtraction, layer slicing) emit those surfaces as\n          //     dense strips of coplanar triangles. Per-vertex normal\n          //     averaging gives a SLIGHTLY-different normal at each\n          //     vertex due to f32 noise from boolean output; the\n          //     boundary between strips then reads as a visible darker/\n          //     brighter scar line \u2014 the horizontal striations on\n          //     walls, stripes on roofs, visible triangulation reports\n          //     across every CSG kernel we have tried (legacy BSP,\n          //     Manifold).\n          //   * cross(dpdx, dpdy) of world position evaluates to the\n          //     EXACT face normal in the fragment shader. Every\n          //     fragment on a flat face \u2014 across an arbitrarily-fine\n          //     triangulation \u2014 gets the IDENTICAL normal, so coplanar\n          //     splits become invisible by construction. No CPU-side\n          //     welding, smooth-grouping, or coplanar-face merging\n          //     fixes the symptom as cleanly.\n          //\n          // Trade-off: genuinely curved surfaces (cylinder tessellations,\n          // BSpline approximations) shade with visible facets. For BIM\n          // that's acceptable \u2014 curved surfaces are < 5 % of typical\n          // model triangle count and the faceting matches CAD-tool\n          // (Revit, ArchiCAD) on-screen behaviour at default quality.\n          //\n          // We still fall back to the vertex normal when derivatives\n          // are unavailable (extreme polygon degeneracy where dpdx /\n          // dpdy collapse to zero \u2014 practically never on real geometry).\n          let faceN = cross(dpdx(input.worldPos), dpdy(input.worldPos));\n          let fLen2 = dot(faceN, faceN);\n          var N: vec3<f32>;\n          if (fLen2 > 1e-10) {\n            N = faceN * inverseSqrt(fLen2);\n          } else {\n            // Degenerate derivative \u2014 fall back to the vertex normal\n            // if it's populated, else +Y.\n            N = input.normal;\n            let nLen2 = dot(N, N);\n            if (nLen2 > 1e-6) {\n              N = N * inverseSqrt(nLen2);\n            } else {\n              N = vec3<f32>(0.0, 1.0, 0.0);\n            }\n          }\n\n          // Stabilize the SIGN of the derivative face normal with the vertex\n          // normal. The screen-space cross product gives the exact face\n          // normal DIRECTION for coplanar strips (the scar-line fix), but at\n          // grazing angles its SIGN becomes numerically unstable per quad \u2014\n          // hemisphere/rim lighting then band-flips across large regions of\n          // flat walls/slabs (diagonal lighter/darker bands). The interpolated\n          // vertex normal is quad-noise-free, so use it only to orient N.\n          // Guard: skip when the vertex normal is missing or nearly\n          // perpendicular to the face normal (unreliable witness).\n          let vN = input.normal;\n          let alignDot = dot(N, vN);\n          if (alignDot * alignDot > 0.03 * dot(vN, vN)) {\n            N = N * sign(alignDot);\n          }\n\n          // Lighting environment \u2014 sun/hemisphere/exposure come from the\n          // global env uniform (defaults reproduce the historic hardcoded\n          // values); fill + rim directions stay fixed in view-agnostic\n          // world space as stylistic shaping lights.\n          let sunLight = env.sunDirection;\n          let fillLight = normalize(vec3<f32>(-0.5, 0.3, -0.3));  // Fill light\n          let rimLight = normalize(vec3<f32>(0.0, 0.2, -1.0));  // Rim light for edge definition\n\n          // Hemisphere ambient\n          let hemisphereFactor = N.y * 0.5 + 0.5;\n          let ambient = mix(env.groundColor, env.skyColor, hemisphereFactor) * env.ambientIntensity;\n\n          // Two-sided sun light so inner faces (I-beam channels) stay visible\n          let NdotL = abs(dot(N, sunLight));\n          let wrap = 0.3;\n          let diffuseSun = max((NdotL + wrap) / (1.0 + wrap), 0.0) * env.sunIntensity;\n\n          // Fill light - two-sided\n          let NdotFill = abs(dot(N, fillLight));\n          let diffuseFill = NdotFill * env.fillIntensity;\n\n          // Rim light for edge definition\n          let NdotRim = max(dot(N, rimLight), 0.0);\n          let rim = pow(NdotRim, 4.0) * env.rimIntensity;\n\n          var baseColor = input.color.rgb;\n\n          // Detect if the color is close to white/gray (low saturation)\n          let baseGray = dot(baseColor, vec3<f32>(0.299, 0.587, 0.114));\n          let baseSaturation = length(baseColor - vec3<f32>(baseGray)) / max(baseGray, 0.001);\n          let isWhiteish = 1.0 - smoothstep(0.0, 0.3, baseSaturation);\n\n          // Darken whites/grays more to reduce washed-out appearance\n          baseColor = mix(baseColor, baseColor * 0.7, isWhiteish * 0.4);\n\n          // Combine all lighting. Keep the lighting term separate so the\n          // selection highlight can reuse it (re-light a blue albedo) without\n          // the base material colour bleeding through.\n          let lightTerm = ambient + env.sunColor * diffuseSun + vec3<f32>(diffuseFill + rim);\n          var color = baseColor * lightTerm;\n\n          // flags.x is a bitfield:\n          //   bit 0 (value 1) = isSelected  \u2192 selection-highlight + force opaque\n          //   bit 1 (value 2) = isOverlay   \u2192 color-override pass; preserve\n          //                                    baseColor.a (overlay pipeline has\n          //                                    src-alpha blending) AND skip the\n          //                                    glass-fresnel branch so low-alpha\n          //                                    ghost tints don't pick up the\n          //                                    near-white reflection tint meant\n          //                                    for real glass materials.\n          // Selected via the per-draw flag (flat path) OR the per-occurrence flag\n          // (instanced path \u2014 vs_instanced reads it from the instance buffer).\n          let isSelected = ((uniforms.flags.x & 1u) == 1u) || ((input.instSelected & 1u) == 1u);\n          let isOverlay = (uniforms.flags.x & 2u) == 2u;\n\n          // Selection highlight \u2014 a blue albedo RE-LIT by the scene lighting.\n          //\n          // We override the material albedo with selection-blue and re-light\n          // it with the SAME lightTerm used for unselected surfaces, then\n          // discard the view-dependent (fresnel) term below. Two requirements\n          // are in tension and this satisfies both:\n          //\n          //   * No base-material bleed-through. The old fresnel-glow mix left\n          //     ~80 % of the lit object colour visible at face centres (the\n          //     green-site / red-roof wash-out). Here the base colour never\n          //     enters the result \u2014 only lightTerm (geometry/light, colour-\n          //     independent) modulates the constant blue albedo.\n          //   * Facet/crease structure must survive. A single FLAT colour\n          //     (the previous fix) collapsed every face to the same blue, so\n          //     internal edges \u2014 which read as the per-face shading STEP, not\n          //     just the faint screen-space edge line \u2014 disappeared on\n          //     selection. Re-lighting keeps that per-face brightness step, so\n          //     creases read on the highlight exactly as they do unselected.\n          //\n          // The luminance of lightTerm is remapped by a multiplicative gain\n          // (which preserves the per-face brightness RATIOS, so creases read\n          // as strongly as on the unselected surface) calibrated so a sunlit\n          // face hits full selection-blue, with a floor/ceiling clamp so\n          // shadowed faces only dim and bright scenes never wash out.\n          if (isSelected) {\n            let shadeLum = dot(lightTerm, vec3<f32>(0.299, 0.587, 0.114));\n            let shade = clamp(shadeLum * 1.55, 0.45, 1.2);\n            color = vec3<f32>(0.3, 0.6, 1.0) * shade;\n          }\n\n          // flags.x bit 5 (value 32) = EMPHASIZE overlay: render the colour\n          // override FULLY UNLIT and saturated (no lighting attenuation, no\n          // wash-to-white) so the focused clash pair reads as a solid, vivid,\n          // distinct colour that pops against the lit model \u2014 like a clash tool.\n          // A faint normal-based shade keeps the silhouette from going flat. (#1277)\n          let emphasizedOverlay = isOverlay && (uniforms.flags.x & 32u) != 0u;\n          if (emphasizedOverlay) {\n            let facet = 0.85 + 0.15 * abs(dot(N, normalize(vec3<f32>(0.3, 1.0, 0.2))));\n            color = baseColor * facet;\n          }\n\n          // Beautiful fresnel effect for transparent materials (glass)\n          // Skip when selected \u2014 the glass shine and desaturation wash out the\n          // blue highlight, making it appear white instead of blue.\n          // Also force alpha to 1.0 for selected objects so the highlight is\n          // fully opaque (the selection pipeline has no alpha blending).\n          // Emphasized clash overlay paints a SOLID vivid fill (force opaque) so\n          // it isn't blended down to a pale tint against the geometry beneath.\n          var finalAlpha = select(input.color.a, 1.0, isSelected || emphasizedOverlay);\n          if (finalAlpha < 0.99 && !isSelected && !isOverlay) {\n            // Calculate view direction for fresnel\n            let V = normalize(-input.worldPos);\n            let NdotV = max(dot(N, V), 0.0);\n\n            // Enhanced fresnel effect - stronger at edges (grazing angles)\n            // Using Schlick's approximation for realistic glass reflection\n            let fresnelPower = 1.5; // Higher = softer edge reflections\n            let fresnel = pow(1.0 - NdotV, fresnelPower);\n\n            // Glass reflection tint (sky/environment reflection at edges)\n            let reflectionTint = vec3<f32>(0.92, 0.96, 1.0);  // Cool sky reflection\n            let reflectionStrength = fresnel * 0.6;  // Strong edge reflections\n\n            // Mix in reflection tint at edges\n            color = mix(color, color * reflectionTint, reflectionStrength);\n\n            // Add realistic glass shine - brighter at edges where light reflects\n            let glassShine = fresnel * 0.12;\n            color += glassShine;\n\n            // Slight desaturation at edges (glass reflects environment, not just color)\n            let edgeDesaturation = fresnel * 0.25;\n            let gray = dot(color, vec3<f32>(0.299, 0.587, 0.114));\n            color = mix(color, vec3<f32>(gray), edgeDesaturation);\n\n            // Make glass more transparent (reduce opacity by 30%)\n            finalAlpha = finalAlpha * 0.7;\n          }\n\n          // Exposure adjustment (historic default 0.85 darkens overall)\n          color *= env.exposure;\n\n          // Contrast enhancement\n          color = (color - 0.5) * 1.15 + 0.5;\n          color = max(color, vec3<f32>(0.0));\n\n          // Saturation boost - stronger for colored surfaces, less for whites\n          let gray = dot(color, vec3<f32>(0.299, 0.587, 0.114));\n          // More saturation for colored surfaces. isWhiteish is derived from\n          // the base material colour, so for a SELECTED object it would leak a\n          // material dependence into the highlight (breaking the no-bleed-\n          // through contract). The selection blue is a fully-saturated colour,\n          // so force the colored-surface boost (1.4) when selected \u2014 keeping\n          // the highlight identical regardless of the underlying material.\n          let satBoost = select(mix(1.4, 1.1, isWhiteish), 1.4, isSelected);\n          color = mix(vec3<f32>(gray), color, satBoost);\n\n          // ACES filmic tone mapping\n          let a = 2.51;\n          let b = 0.03;\n          let c = 2.43;\n          let d = 0.59;\n          let e = 0.14;\n          color = clamp((color * (a * color + b)) / (color * (c * color + d) + e), vec3<f32>(0.0), vec3<f32>(1.0));\n\n          // Subtle edge enhancement using screen-space derivatives.\n          //\n          // Use the SHADED normal (face normal from dpdx/dpdy above)\n          // for the normal-gradient term, not the interpolated vertex\n          // normal \u2014 otherwise we get spurious dark stripes on flat\n          // surfaces whose vertex normals carry numerical noise from\n          // CSG output (the visible scar-line symptom would just\n          // resurface here even after the lit-normal fix). With the\n          // face normal, coplanar adjacent triangles agree exactly \u2192\n          // zero normal gradient \u2192 no false edge; only the genuine\n          // creases between perpendicular faces produce a real\n          // gradient and get the intended outline.\n          let depthGradient = length(vec2<f32>(\n            dpdx(input.viewPos.z),\n            dpdy(input.viewPos.z)\n          ));\n          let normalGradient = length(vec2<f32>(\n            length(dpdx(N)),\n            length(dpdy(N))\n          ));\n\n          if (uniforms.flags.z == 1u) {\n            // Threshold filters subtle normal discontinuities at internal\n            // triangle edges between coplanar entities in the same batch.\n            let edgeFactor = smoothstep(0.02, 0.12, depthGradient * 10.0 + normalGradient * 5.0);\n            let edgeIntensity = f32(uniforms.flags.w) / 1000.0;\n            let edgeDarkenStrength = clamp(0.25 * edgeIntensity, 0.0, 0.85);\n            let edgeDarken = mix(1.0, 1.0 - edgeDarkenStrength, edgeFactor);\n            color *= edgeDarken;\n          }\n\n          // Gamma correction\n          color = pow(color, vec3<f32>(1.0 / 2.2));\n\n          var out: FragmentOutput;\n          out.color = vec4<f32>(color, finalAlpha);\n          out.objectIdEncoded = encodeId24(input.entityId);\n          return out;\n        }\n      ";
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