一鏡到底，其實是 4 段接起來的

我第一次做這支片的穿窗鏡頭，prompt 裡明明白白寫了 immediately pierce through the window。 生出來的東西是這樣：

五秒的鏡頭，一半在做我沒要求的事。我一開始的反應跟大部分人一樣：改 prompt，加更多形容詞，把 FORWARD 全部大寫。沒有用。

真正的原因在首幀。那張圖裡，相機幾乎與幕牆平行。 相機平行於牆面的時候，「往前」這個指令最自然的解，就是沿著牆滑。 模型沒有違背我的 prompt，它是照著我給的幾何條件，選了一個也算合理的解。

修法是把首尾幀都做成正對、一點透視、同一條軸線。 這樣「往前」就只剩一個解，模型沒有走偏的空間。

還有一個相關的坑：首幀正對 + 尾幀斜視 = 逼模型同時做前推、旋轉、升降三種複合運動，必出怪招。 首尾幀的視角關係，本身就是一組隱藏指令。

S2 · HERO穿窗

start = 02_窗外玻璃_v3正對_B　end = 03_桌面螢幕_v3正對_B

Continuous FPV drone shot, no cuts, bright midday daylight. The camera moves
straight FORWARD along a single fixed axis for the entire shot. It never pans,
never orbits, never slides sideways, never drifts laterally along the facade.
Starting outside facing the glass pane dead-on, it pushes forward and passes
through the window in the first half of the shot, a hard specular flare
sweeping across the glass at the moment of passage, exposure dropping sharply
from the bright sunlit exterior to the dimmer shaded interior. Once inside it
continues forward a short distance into the office over the wooden floor and
comes to rest with the desk and its widescreen monitor ahead in the room.
One-point perspective held throughout, dolly-in only. Anamorphic lens, motion
blur at the moment of passage, ease-out at the end, film grain, clean natural
daylight grade with cool shadows, photorealistic, no people, no text.

S1繞行 101，推向窗

start = 01_錨點_空拍fullframe_A　end = 02_窗外玻璃_v3正對_B

Continuous aerial drone shot, no cuts, bright midday daylight, clear blue sky.
First half: the drone flies a wide arcing orbit around the Taipei 101 tower
itself, circling the building laterally at high altitude, the tower staying in
frame as the city rotates behind it, sunlight glancing off its green glass
segments. Second half: the drone breaks out of the orbit, banks away from
Taipei 101 and settles onto a straight forward approach toward the glass
curtain wall of a neighbouring high-rise office tower, squaring up
perpendicular to the glass and closing distance head-on until a single window
pane fills the frame and the shaded office interior with its desk and glowing
monitor is visible straight ahead through the glass. The move ends locked
dead-on to the glass with no lateral drift. Anamorphic lens, smooth sustained
orbit resolving into a straight settled approach, film grain, clean natural
daylight grade with cool shadows, photorealistic, no people, no text.

S3室內推進到螢幕

start = 03_桌面螢幕_v3正對_B　end = 04_螢幕特寫_B

Continuous slow dolly-in, no cuts, bright midday daylight. The camera moves
straight FORWARD along a single fixed axis for the entire shot. It never pans,
never orbits, never slides sideways, never tilts. It glides steadily across
the office toward the widescreen monitor on the desk, the room falling away at
the frame edges, until the monitor's bezel nearly reaches the edges of frame
and the screen dominates the image. The aerial drone footage on the screen
stays perfectly steady and unchanged throughout. One-point perspective held
throughout, dolly-in only. Anamorphic lens, smooth constant motion, gentle
ease-out at the end, film grain, clean natural daylight grade with cool
shadows, photorealistic, no people, no text or UI overlays.

S4螢幕吃滿畫框，閉環

start = 04_螢幕特寫_B　end = 01_錨點_空拍fullframe_A

Continuous slow dolly-in, no cuts. The camera moves straight FORWARD along a
single fixed axis. It never pans, never orbits, never slides sideways. It
pushes into the monitor until the bezel passes completely out of frame and the
aerial drone footage on the screen fills the entire image, becoming the shot
itself. The screen content resolves from monitor-like to full cinematic
clarity and brightness as it takes over the frame, the surrounding dark office
falling away at the edges. One-point perspective held throughout, dolly-in
only. Anamorphic lens, smooth constant acceleration, film grain, clean natural
daylight grade, photorealistic, no people, no text, no bezel and no room
visible at the end.

閉環需要「螢幕裡播的空拍畫面」跟「S1 的空拍首幀」是同一張。 我一開始的做法是先生桌面螢幕圖，再叫模型從螢幕裡把那張空拍圖「還原」成 full frame。

模型是照文字描述重畫，不是復刻構圖。 兩張圖的地標左右相反，環直接破。反向重做（先定錨點圖，再把它塞進螢幕）方向對了， 但仍然只有八成像。八成，在閉環裡等於不合。

正解：後製 Corner Pin，三步

1. S3 / S4 照上面的參數跑，螢幕內容先不管，讓它生什麼是什麼
2. 剪輯軟體裡把錨點圖用 Corner Pin 貼到螢幕四角，跟 tracking 走（S3 和 S4 都要貼）
3. 貼上去的就是 S1 首幀本人，數學上必合

5 分鐘，0 點數，100% 準。

順帶一提，不一定要硬幹真一鏡

穿窗那一下，讓窗框或柱子掃過畫面遮黑 1–2 幀，當隱形剪點，前後分兩次生成再接。 這是業界標準的 whip transition，廠商看不出來，也不在乎。 不值得為了「真的一鏡」燒十次點數。