霧の湖を望むフォトリアルな山岳風景(Three.js)

Build a photorealistic mountain landscape in Three.js as a single self-contained HTML file. Show a wide valley with a misty lake, forested hills covered in small pine trees, jagged distant peaks and a large rocky slope close to the camera. Light the scene with a low, warm sun that produces golden haze, soft atmospheric fog and long depth falloff, and add a pale sky with thin clouds. Use procedural terrain with detailed rock texturing and lighting that catches the surface grain. Animate a slow, steady camera drift through the valley so the parallax between foreground slope and distant ridges is clear, with a small bird or distant speck crossing the sky if possible. Keep the palette warm: ochre, brown, muted green and cream. Render at full window size and keep it smooth on a desktop GPU. Done when the scene loads without any external assets and the camera glides continuously over the terrain looking convincingly natural.