> ## Documentation Index
> Fetch the complete documentation index at: https://docs.ideatura.ai/llms.txt
> Use this file to discover all available pages before exploring further.

# Sketch to detail 3D

> Develop a construction sketch into a small 3D junction, then inspect its dimensions and component relationships.

Use a sketch to explore a construction junction in three dimensions: a window jamb and sill, a parapet or a canopy connection. The aim is to inspect how components meet, not simply to reproduce the sketch's appearance.

Start with one junction and work directly in chat. For a flat drafting detail, use [Sketch to detail 2D](https://docs.ideatura.ai/draw/markup/turn-a-hand-sketch-into-an-editable-revit-detail.md).

## 1. Provide the construction information

Attach your dimensioned sketch and any supporting plan or section. Identify materials, layer thicknesses and the extent to model. Mark unresolved connections or dimensions **TBC**.

A section establishes a profile, but may not show its depth or how it ends. Supply those dimensions before asking for a complete 3D junction.

![The same hand-drawn GRC parapet and inverted roof junction used in the 2D chapter.](https://mintcdn.com/ideatura/1JyIwEqT-G_i0mwm/images/sketch-detail-2d/source.svg?fit=max\&auto=format\&n=1JyIwEqT-G_i0mwm\&q=85\&s=6f02491ead2bae4ee4b4ab02293fd44d)

## 2. Define the model you need

Open your own project in Revit and select **Opus 5.5** in Ideatura. Explain where the example should be built and whether you need project elements or a reusable family.

> Build a small 3D study of this parapet and roof junction in a separate Revit test file. Model the wall layers, GRC cladding and coping, roof build-up and fixing angles as separate editable components, following the written dimensions. Use millimetres. Ask me about the depth and any hidden connections that the sketches do not establish. Start with the main components before adding fixings.

For a reusable window or component, follow [Revit families](https://docs.ideatura.ai/model/reference-model/turn-a-detail-into-a-parametric-family.md) and define the parameters and hosting requirements separately.

## 3. Build the junction in stages

Check the main wall layers, coping and roof junction before adding brackets, fixings or seals. Ask Ideatura to identify which Revit objects it has created and how they can be edited.

![Planned screenshot: main components of the 3D junction.](https://mintcdn.com/ideatura/TJR7oJ9XTJf9xXqf/images/sketch-detail-3d/geometry-placeholder.svg?fit=max\&auto=format\&n=TJR7oJ9XTJf9xXqf\&q=85\&s=390aad1efd77c138b84ac3396486985d)

Keep inferred construction separate from information supplied in the sketch. Add small components only when they help explain or test the junction.

## 4. Inspect and correct

Inspect the junction in 3D and in matching sections. Measure the known dimensions and check clearances, overlaps, support and continuity between layers.

> The fixing angle overlaps the insulation. Adjust it to match the section, keeping the GRC panel and structural wall unchanged. Show the revised section and 3D view.

![Planned screenshot: matching section and 3D detail.](https://mintcdn.com/ideatura/TJR7oJ9XTJf9xXqf/images/sketch-detail-3d/result-placeholder.svg?fit=max\&auto=format\&n=TJR7oJ9XTJf9xXqf\&q=85\&s=7e00af537a4b3cf4f424412c7e0e247d)

Select and inspect the components, then review the construction with the relevant project information. A model can help expose a coordination issue; it does not by itself establish structural, thermal or weathering performance.

## 5. Keep what is reusable

Save the checked model for a one-off study. Put recurring modelling and review rules in a skill. If you repeatedly build the same junction with different dimensions, develop a parametric family or a small automation and test its intended size range.


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