Update collision detection to handle triangle meshes and transformed colliders

src/runtime-three/runtime-host.ts

@@ -815,21 +815,40 @@ export class RuntimeHost {
   private collectRuntimeStaticWaterContactPatches(brush: RuntimeBoxBrushInstance) {
     const contactBounds: Parameters<typeof collectWaterContactPatches>[1] = [];
 
-    for (const otherBrush of this.runtimeScene?.brushes ?? []) {
-      if (otherBrush.id === brush.id || otherBrush.volume.mode !== "none") {
+    const runtimeBrushesById = new Map((this.runtimeScene?.brushes ?? []).map((runtimeBrush) => [runtimeBrush.id, runtimeBrush]));
+
+    for (const collider of this.runtimeScene?.colliders ?? []) {
+      if (collider.source === "brush") {
+        const otherBrush = runtimeBrushesById.get(collider.brushId);
+
+        if (otherBrush === undefined || otherBrush.id === brush.id || otherBrush.volume.mode !== "none") {
+          continue;
+        }
+
+        contactBounds.push({
+          kind: "triangleMesh",
+          vertices: collider.vertices,
+          indices: collider.indices,
+          transform: {
+            position: collider.center,
+            rotationDegrees: collider.rotationDegrees,
+            scale: {
+              x: 1,
+              y: 1,
+              z: 1
+            }
+          }
+        });
         continue;
       }
 
-      contactBounds.push({
-        kind: "orientedBox",
-        center: otherBrush.center,
-        rotationDegrees: otherBrush.rotationDegrees,
-        size: otherBrush.size
-      });
-    }
-
-    for (const collider of this.runtimeScene?.colliders ?? []) {
-      if (collider.source !== "modelInstance") {
+      if (collider.kind === "trimesh") {
+        contactBounds.push({
+          kind: "triangleMesh",
+          vertices: collider.vertices,
+          indices: collider.indices,
+          transform: collider.transform
+        });
         continue;
       }