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title: With Qt 6.12, the SkyMaterial is the limit | daily.dev
description: Qt Quick 3D 6.12 adds a new SkyMaterial QML type for rendering a custom sky with your own fragment shader. The same sky also acts as an image-based lighting...
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# With Qt 6.12, the SkyMaterial is the limit

**[Qt](https://daily.dev/sources/qt)** · 7 min read · 0 upvotes · 0 comments

## Summary

Qt Quick 3D 6.12 adds a new SkyMaterial QML type for rendering a custom sky with your own fragment shader. The same sky also acts as an image-based lighting (IBL) source, so it lights the rest of the 3D scene. QML properties set on SkyMaterial are automatically exposed as shader uniforms, and the sky re-renders whenever one changes. Developers can pick skyboxMode (Cubemap, or ScreenSpaceFull/Half/Quarter) to trade quality for performance, and tune radianceMapSize or iblSampleCount for static skies. Qt 6.12 ships an official Sky Material example with atmospheric scattering and ray-marched clouds.

## Full article

daily.dev links to this article rather than hosting it. Read it at the original source: <https://www.qt.io/blog/with-qt-6.12-the-skymaterial-is-the-limit>

## Questions this post answers

### How do I use the new SkyMaterial type in Qt Quick 3D 6.12 to render a custom sky?

Point SceneEnvironment::skyMaterial to a SkyMaterial object and set SceneEnvironment::backgroundMode to SceneEnvironment.SkyMaterial. The SkyMaterial's fragmentShaderCode (or fragmentShader for a file) defines a MAIN() entry point that writes to FRAGCOLOR, using the built-in qt_eyeDir direction vector to compute the sky color for each fragment.

_Building dynamic skies in Qt Quick 3D? daily.dev surfaces Qt graphics updates like this as they land._

### How do custom QML properties get passed into a SkyMaterial fragment shader in Qt Quick 3D?

Compatible QML property types set directly on a SkyMaterial object are automatically exposed as uniforms inside its fragment shader. Supported types include real, int, bool, color, vectors, matrices and textures, each mapping to a natural GLSL counterpart. Whenever one of these properties changes, such as through a NumberAnimation, the SkyMaterial automatically re-renders the sky.

_Developers wiring shader uniforms to QML state can track Qt Quick 3D graphics changes on daily.dev._

### What is the difference between SkyMaterial.Cubemap and the ScreenSpace skybox modes in Qt Quick 3D 6.12?

Cubemap mode, the default, renders the sky once into a cubemap and filters it into radiance and irradiance maps for image-based lighting (IBL), making it cheaper for a static sky since it's only sampled afterward. ScreenSpaceFull, ScreenSpaceHalf, and ScreenSpaceQuarter instead run the sky shader directly on screen every frame at full, half, or quarter resolution, skipping cubemap and IBL generation, which suits a sky that changes constantly but costs more per frame.

_Choosing a rendering mode for a real-time sky is easier when you track Qt 3D performance tips on daily.dev._

## Similar posts on daily.dev

- [Lightmap Baking and Other Improvements in Qt Quick 3D](https://daily.dev/posts/lightmap-baking-and-other-improvements-in-qt-quick-3d-aowx9ds2k) · Qt · 0 upvotes · 0 comments
- [On Rendering the Sky, Sunsets, and Planets](https://daily.dev/posts/on-rendering-the-sky-sunsets-and-planets-d0iudopxi) · Hacker News · 0 upvotes · 0 comments

---

Tags: [#game-development](https://daily.dev/tags/game-development), [#3d](https://daily.dev/tags/3d), [#qt](https://daily.dev/tags/qt), [#qml](https://daily.dev/tags/qml)

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