Raw Cube – Portrait Format

One work across two stacked projections, 5.6 metres high

VisualisationMuseumFree spatial study

Visualisation of a fictional space – not a realised project.

A nine-metre-high cabinet in exposed concrete. On the end wall, “Kreuz” from the Raw Cube series stands in portrait format – from one video, divided between two projections placed one above the other.

A vertical strip is cut from the centre of the work video and divided between two projectors: the upper one hangs from a cross truss, the lower one stands on a floor stand in front of the wall and remains visible as part of the installation. Together they create an image of five by 5.6 metres.

The black ground of the work lets the projection surface stand out only slightly from the concrete wall; the light of the cubes grazes the rough surface.

Technical details

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

Upper row: One Panasonic PT-MZ882 projector with ET-ELW22 lens (short-throw zoom), 8,200 lumens, hangs from a cross truss. The image measures 5.00 × 2.81 m with its bottom edge at 3.41 m; the throw distance is 3.95 m (throw ratio 0.79:1, lens shift -45% vertical). Calculated luminance on the wall: approx. 186 cd/m².

Lower row: One Panasonic PT-MZ882 projector with ET-ELW22 lens (short-throw zoom), 8,200 lumens, stands on a floor stand. The image measures 5.00 × 2.81 m with its bottom edge at 0.60 m; the throw distance is 4.80 m (throw ratio 0.96:1, lens shift 52% vertical). Calculated luminance on the wall: approx. 186 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: high cabinet in exposed concrete with anteroom
Configuration: two landscape images one above the other from one video (strip from the centre of the image)

Room	Width	Depth	Height
Cabinet	8 m	10 m	9 m
Anteroom	5 m	6 m	3.8 m

Projection

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

1 × Projector · Upper row

5 m × 2.81 m per image

Bottom edge: 3.41 m
Distance: 3.95 m
Throw ratio: 0.79 : 1
Lens shift: -45 % vertical
Mounting: on the truss

1 × Projector · Lower row

5 m × 2.81 m per image

Bottom edge: 0.6 m
Distance: 4.8 m
Throw ratio: 0.96 : 1
Lens shift: 52 % vertical
Mounting: on a stand

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: 186 cd/m²
Target value: 60 cd/m²
required luminous flux: 3,446 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
Epson EB-PU1008W	ELPLU03S (Short Throw #1)	8,500 lm	192 cd/m²
Barco G62-W9	R9801840 G lens 0.75-0.95:1 (Short Throw)	9,500 lm	215 cd/m²
Panasonic PT-REZ15	ET-C1W400 (Weitwinkel-Zoom)	15,000 lm	340 cd/m²

Price range and equipment list on request.

Drawings

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

Raw Cube – Portrait Format — Axonometric view — **Axonometric view** · not to scale

Raw Cube – Portrait Format — Floor plan — **Floor plan**

Raw Cube – Portrait Format — 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.