Projection Mapping at Home — A First DIY Project

You do not need a festival budget to learn projection mapping. A home projector, a laptop and some white cardboard boxes are enough to understand everything that happens on a cathedral facade.

What you need

• A projector. Any home or office projector works in a dark room; 2,000–4,000 ANSI lumens is plenty. Avoid tiny "LED lumen" projectors with unclear specs.
• A computer with an HDMI output.
• Software: a trial of HeavyM or MadMapper, the free non-commercial edition of TouchDesigner, or open-source MapMap.
• Something to map: three or four white boxes stacked at angles, a white sculpture, a mannequin head or a piece of furniture. Matte white surfaces are easiest.

Step 1: set up the projector

Place the projector so it covers the whole object, as straight-on as possible. Use the zoom and focus rings; avoid digital keystone. Fix the projector so it cannot move — a bump will ruin your alignment. Check the distance you need with the throw-distance calculator.

Step 2: extend your desktop

Connect the projector as a second display (not mirrored). The mapping software sends its output to the projector while you work on the laptop screen.

Step 3: map the surfaces

Create one surface (a quad or polygon) for each face of your object. Drag the corners on the projected output until each shape sits exactly on its face — this is corner-pinning. For curved objects, use a mesh warp or several smaller polygons. Add masks so no light spills onto the wall behind.

Step 4: add content

Start simple:

1. Fill each face with a different solid colour and fade between them.
2. Add an outline that traces the edges, then animate it.
3. Make light "flow" from one face to the next.
4. Try the built-in effects or audio-reactive modes and play music.

Then create your own: export a screenshot of your surfaces as a template, animate on top of it in any editor, and play the result back.

Common mistakes

• Projector moved after mapping — fix it in place and re-check before showing anyone.
• Room not dark enough — ambient light kills contrast; close curtains and switch off lamps.
• Too much detail — bold shapes read better than thin lines.
• Forgetting the shadow — people walking between projector and object cast shadows; mount the projector high.

Ideas for next projects

Map a doorway or fireplace, a birthday cake, your bookshelf, a car in a garage, or a window from outside at night. When you are ready to go outdoors, read How to plan a building projection.

FAQ

Can I use a cheap mini projector?

For a small object in total darkness, yes. Expect soft focus and limited brightness; a used office projector with real ANSI lumens is often a better buy.

Which software should I start with?

HeavyM is the most guided for absolute beginners; MadMapper is more flexible and widely used by professionals; TouchDesigner is ideal if you also want interactivity.

Do I need a powerful computer?

For simple mapping and HD video, most recent laptops are fine. Real-time generative content in TouchDesigner benefits from a dedicated GPU.