f22ea72db0
# Objective - Fix the atmosphere LUT parameterization in the aerial -view and sky-view LUTs - Correct the light accumulation according to a ray-marched reference - Avoid negative values of the sun disk illuminance when the sun disk is below the horizon ## Solution - Adding a Newton's method iteration to `fast_sqrt` function - Switched to using `fast_acos_4` for better precision of the sun angle towards the horizon (view mu angle = 0) - Simplified the function for mapping to and from the Sky View UV coordinates by removing an if statement and correctly apply the method proposed by the [Hillarie paper](https://sebh.github.io/publications/egsr2020.pdf) detailed in section 5.3 and 5.4. - Replaced the `ray_dir_ws.y` term with a shadow factor in the `sample_sun_illuminance` function that correctly approximates the sun disk occluded by the earth from any view point ## Testing - Ran the atmosphere and SSAO examples to make sure the shaders still compile and run as expected. --- ## Showcase <img width="1151" alt="showcase-img" src="https://github.com/user-attachments/assets/de875533-42bd-41f9-9fd0-d7cc57d6e51c" /> --------- Co-authored-by: Emerson Coskey <emerson@coskey.dev> |
||
|---|---|---|
| .. | ||
| src | ||
| Cargo.toml | ||
| README.md | ||
Bevy PBR
