Sculpt Dark Color – Station Hall

A widescreen image of 45 × 17 metres on the end wall of a station hall

VisualisationCityFree spatial study

Visualisation of a fictional space – not a realised project.

A station hall 220 metres long beneath a glass roof. On the end wall, “Kugelringe” from the Sculpt Dark Color series runs on six large-format projectors – a widescreen image of 45 × 17 metres above the platforms.

Six projections in a 3 × 2 grid form a continuous wide band from the centre of the work video; the bottom edge lies at seven metres, above the transverse platform. Steel trusses at twelve-metre intervals carry the glass roof; a parked train stands on the middle track.

Visitors stand on the transverse platform in front of the wall and on the platforms between the tracks. The coloured light of the sphere rings rests on rails, roof and train and turns the hall into the site of a single, silent arrival.

Technical details

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

Upper row: Three Barco UDX-4K40 FLEX projectors with R9862001 TLD+ 90° ST lenses (0.65-0.85), 0.72-0.94 on the UDX-4K, 40,000 lumens each, hang from cross trusses. Each partial image measures 15.00 × 8.44 m with its bottom edge at 15.44 m; the throw distance is 12.45 m (throw ratio 0.83:1, lens shift -57% vertical). Calculated luminance on the wall: approx. 101 cd/m².

Lower row: Three Barco UDX-4K40 FLEX projectors with R9801414 TLD+ lenses (0.8-1.16), 0.92-1.33 on the UDX-4K, 40,000 lumens each, hang from cross trusses. Each partial image measures 15.00 × 8.44 m with its bottom edge at 7.00 m; the throw distance is 13.95 m (throw ratio 0.93:1, lens shift -157% vertical). Calculated luminance on the wall: approx. 101 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: station hall with glass roof, platforms, tracks and a parked train
Configuration: 3 × 2 large-format projectors, wide band from the centre of the image
Visitors (approx.): 250

Room	Width	Depth	Height
Station concourse	55 m	220 m	32 m

Projection

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

3 × Projector · Upper row

15 m × 8.44 m per image

Bottom edge: 15.44 m
Distance: 12.45 m
Throw ratio: 0.83 : 1
Lens shift: -57 % vertical
Mounting: on the truss

3 × Projector · Lower row

15 m × 8.44 m per image

Bottom edge: 7 m
Distance: 13.95 m
Throw ratio: 0.93 : 1
Lens shift: -157 % 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.

6 × Barco UDX-4K40 FLEXbright enough

Luminance: 101 cd/m²
Target value: 60 cd/m²
required luminous flux: 31,013 lm
Luminous flux: 40,000 lm

Equipment

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

Barco UDX-4K40 FLEX

Lens: R9862001 TLD+ 90 Grad ST (0.65-0.85), am UDX-4K 0,72-0,94
Luminous flux: 40,000 lm
Weight: 92 kg

Alternatives (3)

Model	Lens	Luminous flux	Luminance
Barco QDX-4K45	R9862001 TLD+ 90 Grad ST (0.65-0.85), am QDX-4K 0,67-0,88	45,000 lm	113 cd/m²
Panasonic PT-RQ35K2	ET-D3LEW300 (Weitwinkel-Zoom)	2 × 30,500 lm	153 cd/m²
Panasonic PT-RQ35K2	ET-D3LEW200 / ET-D3LEW201 (Kurzdistanz-Zoom)	2 × 30,500 lm	153 cd/m²

Barco UDX-4K40 FLEX

Lens: R9801414 TLD+ (0.8-1.16), am UDX-4K 0,92-1,33
Luminous flux: 40,000 lm
Weight: 92 kg

Alternatives (3)

Model	Lens	Luminous flux	Luminance
Barco UDX-4K40 FLEX	R9862001 TLD+ 90 Grad ST (0.65-0.85), am UDX-4K 0,72-0,94	40,000 lm	101 cd/m²
Barco QDX-4K45	R9801414 TLD+ (0.8-1.16), am QDX-4K 0,86-1,25	45,000 lm	113 cd/m²
Christie Griffyn 4K50-RGB	144-111014-XX ILS4 0.9:1 HB fest (UHC: 163-117100-XX)	50,000 lm	126 cd/m²

Price range and equipment list on request.

Drawings

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

Sculpt Dark Color – Station Hall — Axonometric view — **Axonometric view** · not to scale

Sculpt Dark Color – Station Hall — Floor plan — **Floor plan**

Sculpt Dark Color – Station Hall — 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.