How to do projection mapping
from an empty room to your first show
This is how to do projection mapping when you have never tried it: what it is, what to buy or borrow, the steps in order, and the handful of mistakes that catch almost every beginner. Projection mapping for beginners is mostly about patience with one projector and a few pale objects. The software part is quicker than you think.
What is projection mapping?
A projector normally throws a plain rectangle of light onto a wall. Projection mapping shapes that light to fit real things: a stack of boxes, a doorway, a speaker, a sofa. Each surface gets its own picture, and each picture stays on its surface, so the objects themselves seem to glow, change colour and move.
The projector is aimed once and then left alone. All the shaping happens in software, which works out which of the projector’s pixels land on each object and paints only those. Everything else stays dark, and projected black is simply no light, which is why mapped objects look as if they float.
That is the whole trick. The rest is learning to place the outlines accurately, choose looks that suit the surfaces, and keep the room dark enough for the light to read.
What you need to start
You probably own most of this already. Nothing here needs to be expensive for a first try.
- A projector
- Any projector you can connect to a laptop. A cable (HDMI) is best; a Wi-Fi link works but adds delay. Our projector guide covers what matters when you buy one.
- A laptop with Chrome or Edge
- Prism Mapper runs in the browser, so there is nothing to install. Chrome and Edge are the browsers it is built for; others work on a best-effort basis.
- A phone (optional)
- An iPhone with Safari or an Android phone with Chrome can scan the room and find your surfaces for you. Without one, you draw the shapes by hand.
- Something to prop the phone on
- It must not move during a scan. A small tripod with a phone clamp is ideal; a stack of books works.
- Things to light
- Pale, matt objects are the easiest: white boxes, a painted wall, a white door. Very dark or shiny things need a dimmer room.
- A dim room and some music
- Lights low, curtains closed. For music, the laptop’s microphone is enough to start with.
How to do projection mapping in six steps
This is the order that works. The manual’s first show guide follows the same path in about 15 minutes, with screenshots.
- 01
Set up the projector
Connect it to the laptop and set the displays to Extend, not mirror (on Windows: Win + P, then Extend). Aim and focus it on your objects. In the projector’s own menu, switch off auto-keystone, auto-focus and eco or dynamic dimming.
- 02
Open the projector window
In Prism, start a project and click Open window. Drag that window onto the projector’s screen and click inside it to go fullscreen. Identify shows a test grid: it should fill the picture, sharp and square.
- 03
Find your surfaces
Either scan with your phone (prop it beside the lens; the scan takes about half a minute over a cable) or choose Draw by hand and drag a shape’s corners onto each object. Both routes end with an outline on every surface.
- 04
Give each surface a look
Click a surface, open its look slot and pick a moving look from the library. Change its colours and speed in the look panel. Keep the Test Grid on a while first: its numbered grid shows whether the light sits right.
- 05
Add music
Open Sound, choose the microphone and click Listen. When the beat lamp flashes with the kicks, raise a look’s audio amount or switch on Pulse with the music.
- 06
Save scenes and press GO
Click + Scene when you like what you see, change things, and save another. GO (or Space) fades from one scene to the next. That is a show.
Common beginner mistakes
Nearly every first attempt hits at least one of these. All of them are easy to fix once you know.
- Too much ambient light
- A projector cannot make anything darker than the room already is. Daylight and ceiling lights wash the colours out and spoil a phone scan. Close the curtains and keep the projector the brightest thing in the room.
- Keystone correction left on
- Auto-keystone bends the picture by itself, so your shapes no longer land where you drew them. Switch it off and square the projector up by moving it. If Identify shows an oval instead of a circle, keystone is still on.
- Moving the projector after mapping
- The mapping belongs to that exact projector position. A knock slides every surface off its object. Tape or clamp the projector down; if it does move, scan again, or in Advanced mode align the whole scene for small knocks.
- Dark, shiny or patterned surfaces
- Black objects swallow light and glossy ones throw back hot spots. Colours mix with the surface underneath, so a red box makes every look reddish. Start with white or pale grey, matt surfaces.
- Mirrored displays
- If the laptop’s desktop appears on the projector, the screens are mirrored. Set them to Extend so the projector gets its own picture.
- Eco or dynamic dimming
- The projector brightens and dims by itself as the picture changes, which fights your looks. Turn it off in the projector’s menu.
- Starting too big
- A whole room is a lot to align. A wall with two or three boxes in front of it teaches you every skill in an evening.
Good first projects
Pick one small thing, finish it, then build on it.
A stack of white boxes
The classic. Flat faces, sharp corners, and every face can have its own look. Our boxes guide is a full weekend build.
One flat panel, no phone
A white card or board, one quad, four corners dragged into place. The manual’s first projection without a phone takes about ten minutes.
A speaker or DJ booth
Light the cabinet and let it pulse with the music. Pale fronts work best.
A doorway or alcove
A recess gives real depth. Light the frame, keep the opening dark, and it looks like a portal.
A window for Halloween
A white sheet or blind behind the glass, seen from outside after dark. Simple to map, and the street sees it.
A plaster or paper sculpture
Folded paper or a white cast is pale, matt and full of faces to light separately.
What the free plan covers
You can learn all of this on the free plan. It includes the full studio with one projector, phone scans that keep every surface they find, up to four shapes of your own, 12 starter looks, four scenes to switch between, looks that react to the beat and the volume, two saved projects and two AI credits to try. Projections carry a small Prism Mapper watermark.
Paid plans add your own images and videos, every look and look pack, every music reaction, the timeline, cues and, on Studio and above, show mode and more projectors. None of that is needed for a first box on a Saturday night.
Is projection mapping hard for beginners?
Not with modern software. The hard part used to be drawing every shape by hand; a phone scan can now find the surfaces for you. The real skills are keeping the room dark, the projector still and the surfaces pale.
Can I do projection mapping with any projector?
Any projector you can connect to a laptop as a second display will work for a first project. Brighter projectors cope better with some room light, and a cable connection beats Wi-Fi for delay and scan speed.
Do I need a phone to start projection mapping?
No. Choose Draw by hand and drag a shape’s corners onto each object. The phone scan is quicker for many objects, because it finds and outlines the surfaces itself.
What surfaces are best for projection mapping?
White or pale grey, matt surfaces with clear edges: card boxes, painted walls, plaster, paper. Dark surfaces absorb the light and shiny ones reflect hot spots.
How long does a first projection mapping project take?
The manual’s first show guide takes about 15 minutes once the projector is set up, and the phone scan itself takes about half a minute over a cable. Allow an evening to experiment with looks.
Is Prism Mapper free?
It is free to start. The free plan has one projector, 12 starter looks, two saved projects and a small watermark; paid plans add your own media, more looks, the timeline and more.
Map your first object tonight
Open Prism Mapper in Chrome or Edge, plug in the projector and follow the steps above.
Start creating free