3D Previz: block a shot in 3D
Describe a scene, adjust it in the browser, place the cameras and export frames, video and an AI package to drive the video generator.
What it is for
3D Previz builds a simplified version of your shot in 3D: grey volumes, mannequins, lights and cameras with real values. You decide framing, lens and move there, then export what the video generator needs to see: the start frame, the end frame, a reference video of the move and a structured prompt. A scene is set once and serves every generation after it.
The studio opens from the "3D Previz" entry of the side menu. It is designed for a computer screen: on a phone you can open a project, play its shots and run the exports.
Create a scene
Describe the scene in a sentence or a paragraph: the place, the characters, what they do, the mood, the camera if you care about it. Add up to twenty reference images: a location, a moodboard, a character. The "Generate the 3D scene" button shows the cost in credits: from 5, 12 on average, reserved before generation and settled to the real usage afterwards.
The AI director places the set, the characters, the lights and a first camera. It never produces code: it describes a scene that the server, then the browser, validate, repair if needed, and display. You can also start from an empty scene and place everything by hand from the Add menu.
Move around and select
In Orbit view, the left button rotates around the target, the right or middle button pans the view, the wheel zooms toward the cursor. The WASD or ZQSD keys move, Q and E go up and down, Shift speeds up. F frames the selection, H frames the whole scene, a double click on an object frames it too.
Click an object, a mannequin, a light or a camera to select it; cameras are picked on their lines or their body. The Scene panel on the left lists everything and lets you hide or lock. Right click opens the context menu: frame, duplicate, hide, lock, ask the AI director, delete.
Place and adjust
The Select (V), Move (W), Rotate (E) and Scale (R) tools show a gizmo on the selection. In the Select tool you can also drag an object directly on the floor. The inspector on the right shows position, rotation, size, material and visibility: every numeric field scrubs with the mouse, hold and drag up or down to change the value, Shift for fine steps, Alt for fast ones.
The Add menu offers the blocking kit: cubes, walls, floors, stairs, pillars, arches, bridges, ramps, rocks, trees, mountains, doors, windows, tables, chairs, vehicles, animals, mannequins, image planes for your references, and GLB model import. Smart placements (on the floor, facing the target, behind, aligned, mirrored) save you from typing numbers.
Cameras and shots
A scene holds several cameras and several shots; each shot has a camera, a duration, a ratio (16:9, 9:16, 1:1, 21:9, 4:5 or custom) and its animation tracks. A camera's inspector gives the full-frame lens (14 to 135 mm), the height, the aim, the "Drive the camera" section with two pads (orientation and movement) and a height slider, the framing overlays and the move presets.
The picture-in-picture at the bottom right shows what the selected camera sees, otherwise the shot's camera. The Camera view (key 4) shows its image letterboxed to the shot's ratio, with the start and end frame buttons, recording and the camera switcher. The virtual camera is recorded by moving through the scene; the recording panel then sets smoothing, stabilization, speed, amplitude and trimming before turning the take into a track.
Moves, paths and timeline
The 25 move presets (pans, tracking shots, crane, orbit, arc, follow, reveal, vertigo, handheld, POV walk and more) are set in duration, intensity and distance, and can be replayed at will. The Path tool (P) lays a route click by click on the target's floor: Enter or double click to finish, Backspace to remove the last point, Escape to cancel. On a camera it becomes a track lasting the whole shot; on a character, a walk at 1.3 m/s facing the next point.
The timeline at the bottom shows the tracks and their keyframes. Any manipulation in auto-key mode sets a key at the current time; drag a key to move it, Delete removes it. Space plays, the arrows step frame by frame, the shot strip switches from one shot to another.
AI director
The AI Director panel has two modes. "Edit" applies precise operations to the scene: "place a low camera behind Lea", "backlight the scene", "move the camera back two meters and switch to 50 mm". "Ask" answers your questions without touching anything: "which lens for a wide shot of this corridor?". Every message shows its cost before sending and is settled to the real usage afterwards.
Edits go through the same validation as the initial scene: nothing breaks the project, and Ctrl+Z undoes any operation of the director like any mouse gesture.
Export and generate
The Export button offers the shot's image (up to 4K, PNG or JPEG), the shot's mp4 video encoded in the browser (720p to 4K, 24, 25 or 30 frames per second), the contact sheet, the storyboard of every shot, and the AI package: a zip with the start frame, the end frame, the reference video, the shot description, the structured prompt for Seedance and the camera metadata as JSON. No export spends a credit.
On the canvas, plug the start frame and the end frame into a Video node, paste the structured prompt and pick the model: Seedance 2.5, Kling V3 or Wan 3.0 for framing, Kling 3.0 Motion Control with the reference video as a motion reference. The project saves itself every few seconds, Ctrl+S forces a save, and a second tab open on the same project is detected.