SunForm is currently in active beta development. You are using unfinished software. Outputs may be incomplete, inaccurate, or incorrect — this is expected at this stage and is part of why your testing matters.

All outputs are indicative only. They have not been validated against any building regulation, standard, or code of practice — including BRE 209, BS EN 17037, or the Building Regulations 2010. Do not use them for any formal purpose.

As a beta tester you are asked to use SunForm critically. If something looks wrong, it may well be. Please report anything unexpected so the tool can be improved.

SunForm is provided free of charge and entirely at your own risk. To the fullest extent permitted by law, Jake White Architecture accepts no liability for any loss or damage arising from use of or reliance upon its outputs.

The tool and its source code remain the intellectual property of Jake White Architecture.

Third-Party Software Credits

SunForm incorporates the following open-source libraries. These are independent projects maintained by their respective authors; Jake White Architecture does not claim ownership of, nor accept liability for, any third-party component.

Three.js (r128) — 3D rendering — MIT License — © Three.js Authors
web-ifc (0.0.57) — IFC file parsing — Mozilla Public License 2.0 — © IFC.js Contributors
Leaflet (1.9.4) — Interactive maps — BSD-2-Clause License — © Volodymyr Agafonkin
jsPDF (2.5.2) — PDF generation — MIT License — © jsPDF Contributors
Flask (3.x) — Python web framework — BSD-3-Clause License — © Pallets Projects

Sun position calculations use the Spencer (1971) algorithm; shadow ray–triangle intersection uses the Möller–Trumbore algorithm. Both are implemented from published academic sources and carry no third-party licence obligations.

SunForm is provided by Jake White Architecture. For professional Architectural Technology services, visit jakewhitearchitecture.com

I understand that SunForm is beta software and outputs may be inaccurate. I will not use them for any formal purpose. I confirm that I am competent to interpret solar analysis outputs and would be able to identify inconsistencies or errors in the results. I understand that SunForm is not a substitute for professional daylighting consultancy and I will not present its outputs to others as verified analysis.

Free sun hours and solar shading analysis for designers

Import an IFC or BIM model and see direct sunlight hours across roofs, ground and facades as a smooth 3D heatmap.

SunForm is a free, browser-based solar analysis tool for architects, architectural technologists and designers. Load a building model, pick a location and season, and run a sun hours study to understand daylight, solar exposure and solar shading across a scheme. Everything runs in your browser, with no login and nothing to install.

Sun hours analysis on roofs, ground surfaces and vertical facades
Solar shading and shadow studies driven by real sun paths
Direct IFC and BIM model import via web-ifc
Smooth, per-pixel 3D sunlight heatmap with no visible grid
Seasonal comparison across winter, spring, autumn and summer
Export coloured GLB models and dimensioned PDF plans

Designed for

Domestic-scale solar studies, extending to small commercial and public projects. Built for architects, architectural technologists, surveyors and designers who can critically interpret and verify the results.

Before you begin

Tool preview, accept the terms to launch

SunForm does not verify compliance. It is an indicative design aid, not a substitute for professional daylighting or right to light consultancy. Sun hours results depend on the accuracy of your model and inputs, and all outputs must be independently checked by a competent person before use.

Smaller grid = more detail but slower analysis.

Select one or more seasons. At least one must be active.

Beta Testing Feedback

Check this result on SunCalc.org →

Open the link, then compare the Azimuth and Altitude values shown on SunCalc with SunForm's values below.

Latitude:

Longitude:

Date:

Time (local clock):

Enter the values from your chosen calculator:

Azimuth (deg)

Altitude (deg)

Results Comparison

Your Input (external calculator)

Azimuth:

Altitude:

SunForm Calculated

Azimuth:

Altitude:

Difference

Azimuth:

Altitude:

Select Analysis Surfaces

Click surfaces in the 3D view. Double-click vertical walls to select all faces.

SunForm Terms of Use & Disclaimer

Free sun hours and solar shading analysis for designers

Import an IFC or BIM model and see direct sunlight hours across roofs, ground and facades as a smooth 3D heatmap.

Confirm Download

Beta Testing Feedback

Results Comparison