Blender Product Film

Blender product film

Everything is driven by JSON shot specs → scripts/pfilm.py (runs inside Blender) → PNG frames → scripts/finish.py (edit, titles, audio). Blender 4.2+（BLENDER 環境變數或在 PATH 上；建議有 OptiX/CUDA 的 GPU）。選配 Real-ESRGAN（REALESRGAN 環境變數指到 realesrgan-ncnn-vulkan）。

Pipeline

build/
  product/        prep_product.py output (from the user's photo)
  shots/S1.json   one spec per shot (format: top of scripts/pfilm.py)
  renders/…       frames
  edit.json       the cut: order, transitions, titles, music, SFX (format: top of scripts/finish.py)

1. Product. User photo (front view, plain background) → python scripts/prep_product.py <photo> --out build/product --height <real height m> Small images are AI-upscaled 4× first. Open build/product/check.png and confirm the green silhouette hugs the product and the magenta print mask covers the label/cap and not the clear body. No photo → procedural "type": "bottle" (see pfilm.py).
2. Shot specs. One JSON per shot in build/shots/, written from the plan's shot table (camera language below).
3. Look-dev stills (fast, do this first, iterate here): python scripts/render_shots.py build --quality final --stills auto (start/middle/end of each shot) → out/check/<id>_stills.jpg
4. Motion preview of every shot + a rough cut compared to the reference: python scripts/render_shots.py build --quality preview --cut → out/check/<id>_preview.jpg, out/preview_cut.mp4, compare sheets
5. Compare with the reference (see Review) and fix; repeat 3–5 until every shot passes.
6. Final: python scripts/render_shots.py build --quality final (≈1.5–4 s/frame at 1080p) → python scripts/finish.py build/edit.json.

Camera language (use these; name them in the plan)

Every shot has a move, a subject, a fill and a motivation. Speed: match the reference, measured. Premium films move slowly — the reference's shot_details[].camera.pace is usually slow/medium. The ranges below are the total travel for a ~3 s shot at a slow pace; macro shots need far less travel than full-product shots (on a small region, fill 0.95→0.85 already reads as a 50% zoom). Always: preview → --cut compare → scale with camera.speed_scale (ratio reference speed ÷ our speed, floor ≈ 0.2 so nothing goes dead) → re-preview, before the final render.

Rules of the look (what makes it read "premium"):

• Black stage, low key. set.backglow gives a soft coloured pool on a dark backdrop; key light low (≈5), rim strips do the modelling, one moving sweep light per hero shot. Never a flat bright background.
• The product fills the frame. Hero ≥ 0.7 of frame height; details via region + fill ≥ 0.8. A small product in a big black frame is the #1 failure.
• Every shot moves (camera or product or light), slow and eased — no cut to a dead still.
• Open with a reveal: shot 1 starts dark and the light finds the product (lights.reveal: [0, 1.5]), centred or on a third with purpose. It is the most striking image of the film — never a static, half-empty frame.
• Empty frame has a job. More than half the frame black and empty is only allowed when a title lives there. Tall thin products (bottles) cover little area even at full height: crop tighter (cap-to-label), go lower and closer, or put the title in the empty side. pfilm prints PFILM_WARN (and meta.json) when the product is small or its texture too soft for the close-up — treat warnings as defects.
• Close-up rims: pfilm switches to a 4 mm strip at equal radiance on close-ups (a fine edge line). Don't force closeup_rim up: a thick continuous white outline reads as a cut-out sticker.
• Titles: headline cards 0.06–0.09 of frame height, supers next to the product 0.04–0.05, closing brand line ≥ 0.05. Never three text beats in a row without a product image between them unless the reference does exactly that.
• Depth of field by depth, not f-number: "dof": "shallow|medium|deep" computes the f-stop for the camera distance (macro at f/3.5 leaves ~2 mm sharp — unusable). Focus sits on the product's front surface automatically.
• Titles are 2D, in negative space, never over the product: short (3–8 characters/words), grey + white two-tone, light_up or rise reveal. Title-only frames (black + text) ≤ 15% of runtime — a product film is pictures first.
• Macro on bubbles / droplets needs a bright area behind the product (clear things only show what they refract): bring the backdrop close (set.backdrop_dist ≈ 0.55) and make the back spot small and bright (backglow_spread ≈ 30, strength 9–16, backglow_height ≈ 0.25).
• Light sweep energy ≈ 6–10. A bright strip passing between lens and product washes the label and cap to white.
• Atmosphere (pfilm set): ground_fog = low rolling haze at the base only (density ≈ 0.3, height ≈ 0.08 m) for "mist / cool" beats — never a whole-frame grey wash. caustics = moving water-light lines on the backdrop for "ocean / water" beats; best on a mid-blue backdrop (backdrop_color), keep it subtle (default strength 0.35) and let depth of field soften it.
• Rising bubbles are product.bubbles (inside the water); condensation is product.droplets (outside). A shot that promises bubbles must show bubbles.
• Clear liquids need light BEHIND them. In a dark field, water reads as black ink unless something bright sits behind it: keep a soft bright zone behind the product in every dark shot (set.backglow strong and low behind the body, or a glow card), so the liquid refracts light and reads clear. "Is the water clear?" is the first question for any drink film.
• Titles say something. Repeating the product name is not a message: each text beat is one claim (taken from the pack or the user) followed by the picture that proves it. The name appears at the open and the close.
• Don't repeat a detail: the same close-up subject (e.g. the cap) at most twice per film; vary subject, scale and angle between neighbouring shots. Keep the product's colours identical across shots — change light level, not hue.
• The last shot is a hero: full product or shoulder-and-label, fill ≥ 0.7, a final light sweep across the name, and ≥ 1 s of stable frame before the fade.
• Proof shots: turn each claim into a picture of the product (droplets = cold, bubbles rising = fresh, macro label = the name, orbit = the shape). Only claims that are printed on the product or given by the user; never invent specs for a real brand.
• Cuts on motion: the next shot continues the direction of the last (orbit right → next move right), or dips through black at section breaks.