Struct LightSourcePositional 

pub struct LightSourcePositional<'m, 's> { /* private fields */ }

Borrowed projection of IfcLightSourcePositional: a point light with a quadratic distance-attenuation law.

The three attenuation coefficients are plain IfcReal in every bundled schema – unbounded and unsigned – so they are returned verbatim. IFC inherits the law from ISO/IEC 14772-1 (VRML): attenuation at distance d is 1 / max(c + l*d + q*d*d, 1). This crate does not evaluate it; clamping and unit policy belong to whatever renders the light.

Implementations

impl<'m, 's> LightSourcePositional<'m, 's>

pub fn light_source(&self) -> LightSource<'m, 's>

The inherited IfcLightSource colour and intensity attributes.

pub fn position(&self) -> StyleResult<EntityId>

The Position attribute: a mandatory IfcCartesianPoint reference.

Note the asymmetry with IfcLightSourceGoniometric, which uses a full IfcAxis2Placement3D: a positional light is rotationally symmetric, so the schema gives it a bare point and no axes.

pub fn radius(&self) -> StyleResult<f64>

The Radius attribute, an IfcPositiveLengthMeasure.

Reported in the file’s own length unit. This crate does not resolve IfcUnitAssignment; scaling is the caller’s job, as it is for every other length this crate touches.

pub fn constant_attenuation(&self) -> StyleResult<f64>

The ConstantAttenuation coefficient.

pub fn distance_attenuation(&self) -> StyleResult<f64>

The DistanceAttenuation (linear) coefficient.

pub fn quadric_attenuation(&self) -> StyleResult<f64>

The QuadricAttenuation (quadratic) coefficient.

Trait Implementations

impl<'m, 's> Clone for LightSourcePositional<'m, 's>

fn clone(&self) -> Self

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl<'m, 's> Copy for LightSourcePositional<'m, 's>

impl<'m, 's> Debug for LightSourcePositional<'m, 's>

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.