Struct ScalarVisibleFaces 

pub struct ScalarVisibleFaces;

Reference provider: visible face regions decided exactly in the view’s frame. Portable exact orthographic visible-face provider.

Visibility is decided exactly (module docs of faces): the image is cut by an exact arrangement of the visible mesh edges, the clip segments, the cross-sections of interpenetrating triangles and the crop box; each side of each piece is labelled with the sources frontmost just beside it; and the pieces between different labels bound the regions. Nothing is rounded before a decision. The regions are then snap-rounded to the binary64 grid (ADR 0100): each vertex is the exact point rounded once, so it equals the hidden-line endpoint of the same point, unless an edge passes through the rounding cell of another vertex, in which case the edge is routed through it.

Where several sources are at equal depth over an area they all get it and the evidence counts the tied sides. A triangle seen edge-on covers no area and makes no region. A near plane that cuts a MeshRole::Solid leaves a FaceSource::Cap region. A region that collapses under rounding is dropped and counted in the evidence, never refused.

Implementations

impl ScalarVisibleFaces

pub const ID: BackendId

Stable identity of this provider.

pub const fn new() -> ScalarVisibleFaces

Construct the provider.

Trait Implementations

impl Backend for ScalarVisibleFaces

fn descriptor(&self) -> BackendDescriptor

Runtime descriptor and capability inventory.

impl Clone for ScalarVisibleFaces

fn clone(&self) -> ScalarVisibleFaces

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for ScalarVisibleFaces

impl Debug for ScalarVisibleFaces

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

Formats the value using the given formatter.

impl Default for ScalarVisibleFaces

fn default() -> ScalarVisibleFaces

Returns the “default value” for a type.

impl MeshVisibleFaces for ScalarVisibleFaces

fn scratch_requirement(&self) -> ScratchRequirement

Scratch needed beyond inputs and result.

fn cancellation_granularity(&self) -> CancellationGranularity

How finely the provider polls cancellation.

fn visible_faces( &self, request: &VisibleFaceRequest<'_>, options: &ExecutionOptions, ) -> Result<VisibleFaceOutcome, HiddenLineError>

Find the visible face regions of request.meshes in request.view. Implementations must enforce request.limits before growing output.

fn supports_projection(&self, projection: ViewProjection) -> bool

Whether the provider computes regions for views of this projection. The default is true for ViewProjection::Orthographic only; see MeshHiddenLines::supports_projection (ADR 0107).