Function gaussian_blur_definition 

pub fn gaussian_blur_definition() -> EffectDef

Returns the data-only definition of the built-in Gaussian blur.

Its standard deviation is half its radius, a fraction of the output’s shorter side, so a blur is as wide on a portrait picture as on its landscape transpose. A render graph draws it as a cascade of separable passes (crate::RenderGraph::add_effect); its own body is never drawn.