The library
Collections of 3D pieces. Each piece has a picture. Each collection is CC0 or CC BY 4.0, with its author credited.
add model library:kenney/castle/tower-square
- 01
Browse a collection
See every piece with its picture, licence and author.
- 02
Use a piece in a script
Write library:owner/collection/piece, for example library:kenney/castle/tower-square. Heimdall3D downloads the piece once.
- 03
Publish your own
With an account and Gulltopp, create an author, drop in your folder of models, draw the stills and publish.
Gulltopp's guide
Scripts place, you decide
A script places pieces from the library. You can write it, or a language model can through the command line or MCP server. A loop lays a run of wall, scatter plants a wood, and one line places a gate or a tower.
Everything a script makes is an ordinary object in the scene. Pick a gate that stands wrong and move it, turn it or delete it like any model. A whole script run is one Undo step.

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Building Kit
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Car Kit
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Castle Kit
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City Kit Commercial
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City Kit Industrial
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City Kit Roads
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City Kit Suburban
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Factory Kit
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Fantasy Town Kit
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Food Kit
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Furniture Kit
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Holiday Kit
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Mini Dungeon
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Modular Cave Kit
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Modular Dungeon Kit
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Modular Space Kit
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Nature Kit
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Pirate Kit
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Platformer Kit
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Prototype Kit
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Retro Urban Kit
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Space Kit
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Survival Kit
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Tower Defense Kit

The castle from the Castle Kit
One script builds the castle from the product pages out of the 76 pieces in Kenney's Castle Kit.
The seven lessons