Function distant_lit_diffuse

pub fn distant_lit_diffuse(
    direction: impl Into<Point3>,
    light_color: impl Into<Color>,
    surface_scale: f32,
    kd: f32,
    input: impl Into<Option<RCHandle<SkImageFilter>>>,
    crop_rect: impl Into<CropRect>,
) -> Option<RCHandle<SkImageFilter>>

Create a filter that calculates the diffuse illumination from a distant light source, interpreting the alpha channel of the input as the height profile of the surface (to approximate normal vectors).

• direction - The direction to the distance light.
• light_color - The color of the diffuse light source.
• surface_scale - Scale factor to transform from alpha values to physical height.
• kd - Diffuse reflectance coefficient.
• input - The input filter that defines surface normals (as alpha), or uses the source bitmap when null.
• crop_rect - Optional rectangle that crops the input and output.