Build a single-file WebGPU "material study" page called "Plush Penguin": editorial studio layout, large italic serif title "Plush / Penguin.", kicker "Material Studies / No. 016", caption "A fluffy egg on two felt feet. It waddles, it toboggans, it falls over — and always gets back up.", live status chip, specimen panel on the right, stats row (Mass, Volume, Steps, Slide in cm), collapsible "Inside the experiment" notes. UI in English, works on mobile.
The toy: a round plush penguin chick — an egg-shaped stuffed body as one SDF meshed with surface nets, a dark cap and back, a pale fluffy face and belly, big glossy safety-glass eyes, a small felt beak, pink cheeks, two flat felt feet. Its flippers are separate cloth pieces (particle cloth sewn to points embedded in the body) that flop, flap and stretch.
Physics: XPBD soft body on a hex lattice (shape-matched cells + tetrahedral volume preservation, live volume readout), skinned to the mesh, standing on a table with Coulomb friction. Locomotion by posture: a weak pull of the whole body toward its rest shape turned to an orientation and carried with its centre of mass, so the stuffing does the moving. Behaviours: Waddle (rocks side to side, lifting each foot and setting it down ahead), Belly slide (a little hop, flops forward onto its tummy and toboggans across the table, then rocks back up), Flap (happy flapping and a couple of hops), Topple (falls onto its back, belly or side and rocks itself upright with an overshoot), Smooth fur, Reset. Finger: it waddles over to your finger; push it and it falls over. Hand: pick it up, squash it, pull a flipper and it comes along.
Fur: real-time shell fur with alpha-to-coverage — long fluffy down on the body, short on the face, combable with a Comb tool (against the grain darker, with it shinier). Sliders: Stuffing, Pile (mm), Table (felt ↔ ice friction, so it slides further on ice). Palettes: Chick, Classic, Little blue. ¼ speed and mesh toggles, Pause. 60 fps.
中文翻譯
構建一個單文件 WebGPU“材質研究”頁面，名爲“Plush Penguin”：編輯式的工作室佈局、大號斜體襯線標題“Plush / Penguin.”、眉題“Material Studies / No. 016”、圖注“A fluffy egg on two felt feet. It waddles, it toboggans, it falls over — and always gets back up.”、實時狀態膠囊、右側的標本面板、數據行（Mass、Volume、Steps、Slide in cm）、可摺疊的“Inside the experiment”註釋。界面爲英文，可在移動端使用。
玩具：一隻圓滾滾的毛絨企鵝幼崽——蛋形的填充身體作爲一個 SDF，用 surface nets 網格化生成，深色的頭頂和背部，淺色蓬鬆的臉和腹部，大而光亮的安全玻璃眼，一個小毛氈喙，粉色臉頰，兩隻扁平的毛氈腳。它的鰭肢是獨立的布料片（粒子布料縫在嵌入身體的固定點上），會耷拉、拍打和拉伸。
物理：六邊形晶格上的 XPBD 軟體（形狀匹配單元 + 四面體體積保持，實時體積讀數），蒙皮到網格上，站在帶庫侖摩擦的桌面上。以姿態驅動移動：整個身體被微弱地拉向它的靜止形狀，該形狀轉爲朝向，並隨其質心一起移動，因此是填充物在帶動它移動。行爲：Waddle（左右搖擺，抬起每隻腳並放到前方）、Belly slide（小跳一下，向前趴到肚子上，在桌面上滑行，然後再搖回站姿）、Flap（開心地拍動並蹦跳幾下）、Topple（仰面、趴着或側身倒下，然後帶着過沖把自己搖正）、Smooth fur、Reset。Finger：它會搖搖擺擺地走向你的手指；推它一下它就會倒下。Hand：把它撿起來、壓扁它、拉一下鰭肢，它就會跟着過來。
毛髮：採用 alpha-to-coverage 的實時殼層毛髮——身體上是長而蓬鬆的絨毛，臉上則較短，可用 Comb 工具梳理（逆着毛流顏色更深，順着毛流更亮）。滑塊：Stuffing、Pile (mm)、Table（毛氈 ↔ 冰面摩擦，因此在冰面上滑得更遠）。配色：Chick、Classic、Little blue。¼ 速度與網格開關、Pause。60 fps。
