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Fix inconsistent SSR blurriness on rough surfaces.

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X23 2026-02-05 20:02:09 +08:00
parent 7dac0bc3be
commit fe8709d077
1 changed files with 5 additions and 1 deletions
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6
servers/rendering/renderer_rd/shaders/effects/screen_space_reflection.glsl
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@ -311,7 +311,11 @@ void main() {
blur_radius = (a * (sqrt(a2 + fh2) - a)) / (4.0 * h);
}
mip_level = clamp(log2(blur_radius * max(params.screen_size.x, params.screen_size.y) / 16.0), 0, params.mipmaps - 1);
// We approximate the integration in world space with a blur in screen space,
// and use a mip bias, `log2(/* screen_space_blur_radius */ + 1.0)`, to approximate the screen space blur.
// This + 1.0 is needed because mip level is logarithmic to the diameter (in pixels) of sampling region,
// which is 1 pixel when no blur is applied (log2(1) = 0).
mip_level = clamp(log2(blur_radius * max(params.screen_size.x, params.screen_size.y) / 16.0 + 1.0), 0, params.mipmaps - 1);
}
// Because we still write mip level for invalid pixels to allow for smooth roughness transitions,