Minimal Ring – Across the Corner

One work folding around the corner of the room across two walls

VisualisationMuseumFree spatial study

Visualisation of a fictional space – not a realised project.

“Spalten” from the Minimal Ring series runs across two walls that meet in a corner: the left half of the image lies on the west wall, the right half on the north wall.

The corner of the room folds the image in the middle. Depending on where one stands, the work opens like a book or closes into a space around the viewer. Each wall carries an image more than seven metres wide; the bottom edge lies just under one metre – one stands close in front of it.

Visitors come through a low anteroom and first see the corner from diagonally opposite, where the fold has its strongest effect. A bench in the middle of the room invites longer looking.

Technical details

What it takes to build this space: dimensions, equipment, brightness.

Two Panasonic PT-MZ882 projectors with ET-ELW22 lenses (short-throw zoom), 8,200 lumens each, hang from cross trusses. Each partial image measures 7.20 × 4.05 m with its bottom edge at 0.90 m; the throw distance is 5.82 m (throw ratio 0.81:1, lens shift -45% vertical). Calculated luminance on the wall: approx. 90 cd/m². Alternatives, price range and all dimensions per device are listed in the equipment list; floor plan, section and axonometric view show the projection cones.

Room

The room of the scenario and how the images are placed in it.

Room: exhibition room with anteroom
Configuration: across the corner – one video, left half on the west wall, right half on the north wall

Room	Width	Depth	Height
Corner	14 m	10 m	6 m
Anteroom	5 m	5 m	3.8 m

Projection

How the images are created: equipment, image size, distance and mounting.

2 × Projector

7.2 m × 4.05 m per image

Bottom edge: 0.9 m
Distance: 5.82 m
Throw ratio: 0.81 : 1
Lens shift: -45 % vertical
Mounting: on the truss

All partial images belong to one picture – one computer outputs them simultaneously and frame-accurately.

Real time and interaction

The film shows a recording. In the installation the work is computed live – and can respond to the space and its visitors.

Computation: live, in real time, on a high-end computer with a powerful 3D graphics card, NVIDIA RTX 4070 or higher; with many image surfaces also with several graphics cards
Output: all projectors in a room from one computer, as coordinated zones rather than separate videos
Interaction: 3D LiDAR scanners capture people and movement in the space; the work can respond to them
Fitting: mapping to the actual architecture – edges, columns, ceilings and floors

Brightness

Whether the image will be bright enough: luminance achieved against the target value. The line in the bar marks the target value.

2 × Panasonic PT-MZ882bright enough

Luminance: 90 cd/m²
Target value: 60 cd/m²
required luminous flux: 7,145 lm
Luminous flux: 8,200 lm

Equipment

The reference devices used for the calculations. Devices of the same class are equally suitable.

Panasonic PT-MZ882

Lens: ET-ELW22 (Short-Throw-Zoom)
Luminous flux: 8,200 lm
Weight: 18.6 kg

Alternatives (3)

Model	Lens	Luminous flux	Luminance
Barco G62-W9	R9801840 G lens 0.75-0.95:1 (Short Throw)	9,500 lm	104 cd/m²
Panasonic PT-REZ15	ET-C1W400 (Weitwinkel-Zoom)	15,000 lm	164 cd/m²
Panasonic PT-RQ35K2	ET-D3LEW200 / ET-D3LEW201 (Kurzdistanz-Zoom)	30,500 lm	333 cd/m²

Price range and equipment list on request.

Drawings

Axonometric view, floor plan and section show the space and the projection cones.

Minimal Ring – Across the Corner — Axonometric view — **Axonometric view** · not to scale

Minimal Ring – Across the Corner — Floor plan — **Floor plan**

Minimal Ring – Across the Corner — Section — **Section** · not to scale

Glossary

Real time: The image is recomputed at every moment, about 60 times per second, instead of being played back as a finished video.
3D LiDAR scanner: Scans the space with laser light and captures people and movement in three dimensions – the basis of the interaction.
High-end computer: A computer with a powerful 3D graphics card – NVIDIA RTX 4070 or higher – that computes the image live and drives all projectors at once.
Mapping: Fits the projection to the actual geometry of the space so that image and architecture meet exactly.
Throw ratio: Distance divided by image width. At 0.8 : 1, the projector for an image 6 m wide stands 4.8 m away.
Lens shift: Shifts the image within the lens without tilting the projector – so it stays rectangular.
Luminous flux: How much light the projector emits, in lumens.
Luminance: How bright the image surface appears to the eye, in candelas per square metre. In a dark room, about 60 is enough.
Bottom edge: The height of the bottom edge of the image above the floor.
Synchronised output: Several projectors show parts of the same image; one computer outputs them simultaneously – computed live or as video.