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# Objective - There is a flaw in the implementation of `FogVolume`'s `density_texture_offset` from #14868. Because of the way I am wrapping the UVW coordinates in the volumetric fog shader, a seam is visible when the 3d texture is wrapping around from one side to the other:  ## Solution - This PR fixes the issue by removing the wrapping from the shader and instead leaving it to the user to configure the 3d noise texture to use `ImageAddressMode::Repeat` if they want it to repeat. Using `ImageAddressMode::Repeat` is the proper solution to avoid the obvious seam:  - The sampler cannot be implicitly configured to use `ImageAddressMode::Repeat` because that's not always desirable. For example, the `fog_volumes` example wouldn't work properly because the texture from the edges of the volume would overflow to the other sides, which would be bad in this instance (but it's good in the case of the `scrolling_fog` example). So leaving it to the user to decide on their own whether they want the density texture to repeat seems to be the best solution. ## Testing - The `scrolling_fog` example still looks the same, it was just changed to explicitly declare that the density texture should be repeating when loading the asset. The `fog_volumes` example is unaffected. <details> <summary>Minimal reproduction example on current main</summary> <pre> use bevy::core_pipeline::experimental::taa::{TemporalAntiAliasBundle, TemporalAntiAliasPlugin}; use bevy::pbr::{FogVolume, VolumetricFogSettings, VolumetricLight}; use bevy::prelude::*;<br> fn main() { App::new() .add_plugins((DefaultPlugins, TemporalAntiAliasPlugin)) .add_systems(Startup, setup) .run(); }<br> fn setup(mut commands: Commands, assets: Res<AssetServer>) { commands.spawn(( Camera3dBundle { transform: Transform::from_xyz(3.5, -1.0, 0.4) .looking_at(Vec3::new(0.0, 0.0, 0.4), Vec3::Y), msaa: Msaa::Off, ..default() }, TemporalAntiAliasBundle::default(), VolumetricFogSettings { ambient_intensity: 0.0, jitter: 0.5, ..default() }, ));<br> commands.spawn(( DirectionalLightBundle { transform: Transform::from_xyz(-6.0, 5.0, -9.0) .looking_at(Vec3::new(0.0, 0.0, 0.0), Vec3::Y), directional_light: DirectionalLight { illuminance: 32_000.0, shadows_enabled: true, ..default() }, ..default() }, VolumetricLight, ));<br> commands.spawn(( SpatialBundle { visibility: Visibility::Visible, transform: Transform::from_xyz(0.0, 0.0, 0.0).with_scale(Vec3::splat(3.0)), ..default() }, FogVolume { density_texture: Some(assets.load("volumes/fog_noise.ktx2")), density_texture_offset: Vec3::new(0.0, 0.0, 0.4), scattering: 1.0, ..default() }, )); } </pre> </details> |
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Bevy PBR
