This class applies atmospheric effects to a fragment.
Only useful if you're doing your own Shading Model, otherwise this is already all implied when you use ShadingModelStandard.
Apply All
Fog::Apply( float3 WorldPosition, float2 ScreenPosition, float3 Color );
This will apply all types of atmospheric effects onto current pixel (float3 Color) if they are available on scene:
- Gradient fog
- Cubemap fog
- Volumetric fog
If you only need specific fog effects, see the functions below.
Gradient Fog
float3 ApplyGradientFog( float3 Color, float3 WorldPosition, float3 PositionToCamera );
For both gradient and cubemap fog, you need to calculate PositionToCamera. This can be done by simply subtracting world-space camera position from pixel world position:
float3 PositionToCamera = worldPos.xyz - g_vCameraPositionWs;
Cubemap Fog
float3 ApplyCubemapFog( float3 Color, float3 WorldPosition, float3 PositionToCamera );
Volumetric Fog
float3 ApplyVolumetricFog( float3 Color, float3 WorldPosition, float2 ScreenPosition );
Each of these returns the fogged colour, they don't modify their input.