3D Construction Kit
Incentive sold the engine itself
Having shipped four games on Freescape, Incentive packaged the engine as a product: build your own 3D world, compile it to a stand-alone program, and sell it. Domark published it at £24.99 in 1991.
3D Construction Kit is Freescape sold as a tool. Incentive had built four games on the engine — Driller, Dark Side, Total Eclipse and Castle Master — and then packaged the thing itself, published by Domark at £24.99 in 1991.
CRASH reviewed it in May 1991 and called it “an excellent game creation utility”. Your Sinclair gave it 92% and Sinclair User 91%.
Fast facts
- Publisher: Domark, for Incentive.
- Price: £24.99.
- Engine: Freescape.
- Output: stand-alone programs — yours to distribute.
- Also sold as: Virtual Reality Studio, the title used on DOS.
- Bundled: a VHS tape, presented by Ian Andrew himself.
How you built a world
CRASH’s review walks through it, and the vocabulary is recognisably that of a modern 3D editor thirty years early:
- Shapes from a list — cubes, hexagons, triangles, pentagons, lines — which you “stretch, shrink, turn and shade” and position. The magazine notes complex buildings build up quickly this way.
- Pull-down menus and a pointer, with an object placeable in as few as two key presses.
- Global objects to avoid rebuilding repeated geometry: define four walls and a ceiling once, reuse them per room. The review is explicit that this is a memory measure — storing every object per area is “very memory hungry”.
- Conditions, the scripting layer:
IF SHOT THEN GOTO AREA 2. - Sensors, so objects react when the player comes near.
- A resizable window onto the 3D world: “the smaller you have the window your player uses to see into your world” the faster it scrolls. The frame-rate trade-off is a design control, not a hidden constant.
- Border and status panel customisation, with text and score lines for energy and lives.
The video in the box
The package included a VHS tape — around half an hour of introduction and tutorial, presented by Ian Andrew, the designer of Freescape, walking buyers through the Amiga and Spectrum versions.
It is a period-perfect object: a 3D engine complex enough that the manual was not thought sufficient, in a year when the way to show somebody moving three-dimensional graphics was to post them a videotape.
On DOS the same product was sold as Virtual Reality Studio, which dates it precisely. 1991 is the year “virtual reality” became a phrase a marketing department would put on a box.
⚠ The tape’s exact running time is unsettled — sources give both 23 and 30 minutes — so it is described here as about half an hour. The VHS itself and the Virtual Reality Studio title are well attested, but not from the period Spectrum press held in this library, which mentions 3D Construction Kit mainly in classified ads.
Why it is interesting
Two things.
First, it is a commercial 3D engine sold to the public in 1991, at £24.99, on 8-bit hardware — and the review frames the output as something you might make “for pleasure or even monetary gain”, because the kit compiles stand-alone programs with no runtime licence attached.
Second, it is the second time Incentive did this. Five years earlier they had taken adventure authoring and sold it as GAC. The company’s instinct was consistently to ship the tool as well as the work — which is a rarer instinct than it sounds, and the reason both products are still discussed.