From 5d73943e584b1c0c0753dda85fbda34d27726986 Mon Sep 17 00:00:00 2001
From: "Somhairle H. Marisol" <muqiu-han@outlook.com>
Date: Mon, 21 Sep 2026 23:47:42 +0800
Subject: feat(ship): HNX-02 Copernicus rework — continuous hull,
 few-large-element scale, Draco pipeline, side-on framing
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---
 src/SomhairlesDream.Frontend/App.fs | 32 ++++++++++++++++++++++----------
 1 file changed, 22 insertions(+), 10 deletions(-)

(limited to 'src/SomhairlesDream.Frontend/App.fs')

diff --git a/src/SomhairlesDream.Frontend/App.fs b/src/SomhairlesDream.Frontend/App.fs
index 82bae88..72d1be2 100644
--- a/src/SomhairlesDream.Frontend/App.fs
+++ b/src/SomhairlesDream.Frontend/App.fs
@@ -184,25 +184,33 @@ let frameObject (view: ViewState) (node: ThreeNode) =
         let size = createVector3 ()
         box.getCenter center |> ignore
         box.getSize size |> ignore
-        let radius = 0.5 * size.length ()
+        // Fit the longest axis horizontally (it runs across the screen in the
+        // side-on hero camera) and the next-longest vertically.
+        let axes = [| size.x; size.y; size.z |] |> Array.sort
+        let longest = axes.[2]
+        let smallest = axes.[0]
 
-        if radius > 0.000001 then
+        if longest > 0.000001 then
             node.position.set(-center.x, -center.y, -center.z) |> ignore
             let camera = view.Camera
             let width = max 1.0 (float view.Canvas.clientWidth)
             let height = max 1.0 (float view.Canvas.clientHeight)
-            let aspect = width / height
+            let aspect = max 0.3 (width / height)
             camera.aspect <- aspect
             let fovY = camera.fov * Math.PI / 180.0
-            let fovX = 2.0 * atan (tan (fovY / 2.0) * aspect)
-            let limitingFov = min fovY fovX
-            let distance = 1.28 * radius / sin (limitingFov / 2.0)
-            let dirX, dirY, dirZ = 0.62, 0.45, 0.70
+            let tanHalf = tan (fovY / 2.0)
+            // Longest axis lies across the screen; the smallest axis is the
+            // one stacking vertically in a side-on view of a slender vehicle.
+            let halfW = 0.5 * longest / (tanHalf * aspect)
+            let halfH = 0.5 * smallest / tanHalf
+            let distance = 1.25 * max halfW halfH
+            // Side-on hero camera: look across the hull, not down its nose.
+            let dirX, dirY, dirZ = 0.30, 0.44, 0.85
             let norm = sqrt (dirX * dirX + dirY * dirY + dirZ * dirZ)
             camera.position.set(dirX / norm * distance, dirY / norm * distance, dirZ / norm * distance)
             |> ignore
-            camera.near <- max (distance * 0.01) (distance - radius * 2.5)
-            camera.far <- distance + radius * 4.0
+            camera.near <- max 1.0 (distance * 0.05)
+            camera.far <- distance + longest * 3.0
             camera.lookAt(0.0, 0.0, 0.0)
             camera.updateProjectionMatrix ()
 
@@ -374,6 +382,10 @@ let startStepLoad (view: ViewState) (owner: LoadOwner) (historical: bool) =
     loadedStep <- None
     toggleHidden ("viewport-loading", false)
     let loader = createGLTFLoader ()
+    // Attach the Draco decoder so geometry-compressed GLBs stream in small.
+    let draco = createDRACOLoader ()
+    setDracoDecoderPath draco "/vendor/addons/libs/draco/"
+    attachDracoLoader loader draco
     let projectId = JS.encodeURIComponent owner.ProjectId
     let runId = JS.encodeURIComponent owner.RunId
     // Cache-buster: the GLB is always re-fetched from the server.
@@ -723,7 +735,7 @@ let probeSelection : RunSelection =
 
 let shipSelection : RunSelection =
     { ProjectId = "ship-001"
-      RunId = "run-ship-001"
+      RunId = "run-ship-002"
       BaseId = "ship-base-000"
       TargetId = "ship-target-007"
       Render = false }
-- 
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