I built a browser CAD where you type a sentence and walk through the house

Short summary

A solo founder built Forge3D Spaces, a browser-based CAD tool that converts a single text sentence into a walkable, furnished 3D house with floor plans, DXF exports, and cost estimates. The architecture avoids LLM-generated geometry entirely—instead the LLM emits a structured JSON room program that a deterministic slicing-tree solver turns into a watertight building, with WebGPU rendering and CSG for editable wall openings. The editing loop uses the same pattern: the model emits validated operations against a scene graph rather than manipulating meshes directly, enabling chat-driven modifications like moving furniture or adding roofs.

• •LLM emits structured JSON room spec; deterministic solver generates geometry—no LLM touching 3D directly
• •WebGPU renderer with WebGL fallback; BVH-cached CSG for performant wall openings
• •Chat-based editing via validated scene-graph operations; single-model architecture keeps 2D, 3D, elevations, and BoQ in sync

Generated with AI, which can make mistakes.