The interior design guide
Open Rayon

The interior design guide. A definitive knowledge base for interior designers.

From first principles to the finishing touches: shell, surfaces, space planning, furniture, electrics, plumbing and joinery, in the order a project runs.

Get startedKnowledge base

The Lexicon.

Every term, in plain words.

From hue and light reflectance to bonding and kick space, every term the guide uses has a short definition, what to know in practice and the pages that use it.

Open the Lexicon

Use the guide in your AI assistant.

Connect Claude or ChatGPT.

The guide has an MCP server, so your assistant can search it, read its pages and cite them while it answers you. It is free, read-only, and needs no account or key.

Connect to Claude
Open docs
All sections

The interior design guide.

A definitive knowledge base for interior designers.

Eleven chapters take a home from first principles to the moment you show it to the client. Start with Foundations and read in order, or search for a topic, a term or a rule of thumb.

Chapters.

Eleven steps, from principles to presentation.

Keep reading.

Where to go next.

Sections.

Keep reading.

Where to go next.

Global illumination.

What it means in interior design.

Global illumination simulates light bouncing between surfaces, so a white wall lifts the shadows beside it and an oak floor warms the ceiling. Without it, renders look harsh and flat.

In practice

Most of a room’s light is bounced, so GI decides whether a render feels like a real space. Check the colour bleed: a strong rug or wall colour should tint its surroundings, as it will on site.

Where the guide uses it

Related terms.

More from Rendering.

Back to the Lexicon

Units