# Firmament 0.2
**Performance release: more frames, the same look.**
- **Nether and End:** the unused sun shadow map is no longer rendered at all.
- **Overworld shadows:** a depth-only shadow pass; water and clear glass no
longer reach the shadow rasterizer.
- **Cloud shadows:** read from a small map computed once per frame instead of
several noise octaves per lit pixel. Sunlit surface lighting costs less than
half as much as in 0.11.
- **Fog and light shafts:** cheaper shadow lookups along each ray (about 1.2ร).
- **Sky:** clouds and stars are rendered after the terrain. Stars are drawn only
where the sky is visible; in caves and sealed rooms, clouds hidden by terrain
cost much less (about 2.4ร for a cave view with a strip of sky).
- **Ambient occlusion:** open, unoccluded areas skip the reconstruction filter.
The figures are isolated GPU pass timings measured against 0.11 on an RTX 4060
Laptop GPU at 2560 ร 1440 with the High preset, not frame rates. In-game FPS
depends on the scene, render distance and hardware.
Rendering, presets, options and the 29 supported Minecraft Java versions are
unchanged from 0.11: **1.18.2**; **1.19, 1.19.1, 1.19.2 and 1.19.4**;
**1.20โ1.20.6**; **1.21โ1.21.11**; **26.1, 26.1.1, 26.1.2, 26.2 and 26.3**.
Automated OpenGL comparisons match 0.11 within the project's equivalence limits.
Known: after reloading chunks with F3+A, shadows of blocks outside your view
appear once you look at them. Iris only builds chunks the camera sees.
Use the Iris and Sodium builds matching your Minecraft version; 26.2 and 26.3
target the OpenGL renderer. Recorded gameplay evidence remains
**1.21.1 / NeoForge 21.1.228 / Iris 1.8.12 / Sodium 0.6.13** with 0.10-alpha.2.
Keep the ZIP intact, place it in `shaderpacks`, and select Firmament in Iris.
Start with High and adjust the preset for your setup.
A project by **PozziTiv4ik**.
Developer information
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