Nothing to install
It opens in your browser like any web page. No download, no licence key and no graphics-card checklist.
Easy online 3D pre-visualization for AI video
Plan the shot before the AI films it.
Mad Genius AI PREVIS is a user-friendly, lightweight 3D pre-visualization tool that runs online, made for people who are not 3D artists. There is no 3D software to install. Upload your own 3D models or block out a scene with simple grey ones, move a virtual camera through it, and export a reference clip and a ready-made prompt for AI video tools such as Seedance and Kling Omni.
Free to build and preview. No install, no 3D experience needed. Works with GLB, FBX, OBJ, STL and USDZ files.
3D previs without the 3D software
Tools like Blender, Maya and Unreal are powerful, and take months to learn. This does one job, planning a shot, and you can do it on your first visit.
No 3D skills needed
Pick a shape from a menu, drag it into place, and move the camera with your mouse. There is no modelling, rigging, lighting or texturing to learn.
Light and quick
The whole app is under one megabyte, so it loads in a second or two. Your scenes are saved for you as you work.
Words describe a camera move. A clip shows it.
Ask an AI video model for “a slow push-in that drifts left” and it has to guess what you mean. Give it a reference clip of exactly that move and it can follow it.
That is what previs is for. You stage the shot in plain grey 3D, where changing your mind costs nothing, and render the camera move as a short video. The look, the characters and the setting still come from your prompt; the clip only carries the camera.
0–6 seconds — PUSH IN: The camera pushes in toward the subject and zooms in from 35mm to 50mm.
Camera speed: easing in and out.
Stability: smooth and stable, no shake.
3D previs
Final output
Drag the handle: the grey 3D previs on the left, the final AI video it guided on the right.
How it works
Four steps from an empty floor to a camera reference your video tool can follow.
- Build the scenePlace grey figures, boxes, walls and floors, or bring in your own 3D models.
- Frame the shotOrbit, move in and out, and pick a lens, just as you would with a real camera.
- Make the moveAdd camera keyframes, choose a ready-made move, or record your own movement with a phone.
- Export for the AIRender the clip and copy the prompt. Give both to your video tool as the camera reference.
Special feature
Upload your own 3D models
You are not limited to grey boxes. Drop in the actual car, aircraft, product, character or building from your project, and plan the shot around the real thing. The camera move you render then fits its true shape and size.
- Drag and drop. Drop a file on the view and it appears in the scene, sized and standing on the floor.
- Animated files play. If the model comes with an animation, such as a walk cycle, it runs in time with your shot.
- Fly inside. Take the camera through a window or a doorway and into the model.
- Mix and match. Combine your models with the built-in figures, walls and floors, up to 24 in a scene.
- Private. Your files stay in your own browser. They are never uploaded to a server.
GLBGLTFFBXOBJSTLUSDZ
Special feature
Use your phone as the camera
Open the app on an iPhone or iPad and switch on Motion camera. The device becomes a handheld camera inside your 3D scene: turn it and the view turns with you. It is motion capture for the camera, with nothing to buy and nothing to set up.
- Aim by moving. Pan, tilt and roll the device, the way you would frame a real shot.
- Travel with a thumb. Drag on the picture to move through the set, and hold the arrows to rise or sink.
- Record the take. Press the red button and your movement is captured, natural handheld feel included.
- Follow the action. Moving models play while you record, so you can track a walking figure by hand.
- Steady it afterwards. A smoothing control calms shaky hands, and a level-horizon switch keeps the frame straight.
- Render it clean. The captured move plays back and renders like any other, frame by frame.
Everything you need to direct the camera
Built around the way film crews plan shots, without the weight of a full 3D package.
Keyframed camera
Frame a shot, add a keyframe, reframe, add another. The camera glides through them, with the timing of every leg under your control.
Ready-made camera moves
Orbit, pull-back, rocket, push-in, dolly zoom, crane, Dutch roll and whip pan, each applied in one pick and adjustable in length and amount.
Subject lock
Click any part of a model and the camera stays on it. Spotlight keeps it centred, ActiveTrack travels with it, POI circles it.
Motion camera
On an iPhone or iPad, hold the device like a camera and turn it to aim. Record the movement, then render it as a clean clip.
Blockout kit
Build a set in seconds from figures, boxes, walls and floors. Figures can stand, sit, point, walk and run, and any piece can be stretched, turned and resized.
Moving subjects
Give any model its own keyframes: straight or curved paths, eased starts and stops, turning to face where it is going. Group models so they travel together.
Top and side views
See the whole set from above and from the side, and drag models, the camera and keyframes into place with precision.
Real lenses
Focal lengths from 10 to 300 mm, a roll control for Dutch angles, and optional handheld shake.
Frame-by-frame render
Every frame is drawn and written to an MP4 at 30 frames a second, up to 1080p, in 16:9, 9:16 or 1:1. No dropped frames.
Shot prompt, written for you
One click describes the move in plain film language, as a full prompt with timed beats or just the camera section.
Framing guides
Rule-of-thirds and safe-area overlays help you compose, and never appear in the export.
Undo, autosave and scene files
Every change can be undone, your work is kept between visits, and a scene saves to a single file with its models inside.
See it with a sample scene
Each of these opens in the app, ready to play. Change anything you like.
Pricing
Try everything before you decide.
Free during early access
- Build and preview scenes with no account
- Render clips, save frames and copy prompts with a free Google sign-in
- A paid plan at $10 a month, with a 7-day free trial, is planned
Questions
The short answers.
What is previs?
Previs, short for previsualization, is planning a shot before you make it. Film crews block out scenes with simple grey 3D models to decide where the camera goes and how it moves. Mad Genius AI PREVIS brings that step to AI video: you plan the camera move in 3D first, then hand the result to the video model.
Which AI video tools does it work with?
Any tool that accepts a reference video for camera movement. The export presets and the prompt layout are built around multi-reference video generation, such as Seedance 2.0 and 2.5, Kling Omni and others, and the clip itself is a standard MP4 you can use anywhere.
Do I need 3D experience?
No. You add ready-made grey pieces (a figure, boxes, walls, floors), drag them into place, and move the camera with the mouse. There is no modelling, lighting or texturing to learn.
Which 3D files can I bring in?
GLB, GLTF, OBJ, FBX, STL and USDZ. Animations that come with a file can be played, and any model can be shown as plain grey clay.
Does it work on a phone or tablet?
Motion camera mode is made for iPhone and iPad: you hold the device like a camera and turn it to aim. The full editor is designed for a desktop or laptop screen.
Is my work uploaded anywhere?
No. Your scenes and 3D models stay in your own browser and are saved there automatically. You can also save a scene to a file on your computer. Signing in is only used to identify your account.
Is it free?
Building and previewing scenes is free and needs no account. Exporting a clip, a frame or a prompt asks for a free Google sign-in during early access. A paid plan at $10 a month with a 7-day free trial is planned.
Direct the camera. Let the AI do the rest.
Your first reference clip is a few minutes away.
Open the app