ceiling

packages/viewer/src/components/renderers/ceiling/ceiling-renderer.tsx

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+import { type CeilingNode, useRegistry } from '@pascal-app/core'
+import { useRef } from 'react'
+import { faceDirection, float, mix } from 'three/tsl'
+import { DoubleSide, type Mesh, MeshStandardNodeMaterial } from 'three/webgpu'
+import { useNodeEvents } from '../../../hooks/use-node-events'
+
+// TSL material that renders differently based on face direction:
+// - Back face (looking up at ceiling from below): solid
+// - Front face (looking down at ceiling from above): 30% opacity
+const ceilingMaterial = new MeshStandardNodeMaterial({
+  color: 0xffffff,
+  side: DoubleSide,
+  transparent: true,
+})
+
+// faceDirection is 1.0 for front face, -1.0 for back face
+// We want: front face (top, looking down) = 0.3 opacity, back face (bottom, looking up) = 1.0 opacity
+ceilingMaterial.opacityNode = mix(float(1.0), float(0.3), faceDirection.greaterThan(0.0))
+
+export const CeilingRenderer = ({ node }: { node: CeilingNode }) => {
+  const ref = useRef<Mesh>(null!)
+
+  useRegistry(node.id, 'ceiling', ref)
+  const handlers = useNodeEvents(node, 'ceiling')
+
+  return (
+    <mesh ref={ref} material={ceilingMaterial} {...handlers}>
+      {/* CeilingSystem will replace this geometry in the next frame */}
+      <boxGeometry args={[0, 0, 0]} />
+    </mesh>
+  )
+}