Struct CylinderDescriptor 

pub struct CylinderDescriptor {
    pub center: Point3,
    pub axis_origin: Point3,
    pub axis: Vec3,
    pub x_ref: Vec3,
    pub y_ref: Vec3,
    pub radius: f64,
    pub v0: f64,
    pub v1: f64,
    pub u0: f64,
    pub u1: f64,
}

A cylinder surface packed for GPU evaluation.

Extracted from a FaceSurface::Cylinder face via extract_cylinder_descriptor: the axis frame and radius come from the CylindricalSurface; the parametric trim range (v0..v1 axial, u0..u1 angular) comes from the face’s boundary.

Fields

center: Point3

RTC origin — positions are emitted relative to this point. Defaults to the descriptor’s own AABB center via extract_cylinder_descriptor.

axis_origin: Point3

Cylinder axis origin (a point on the axis at v = 0).

axis: Vec3

Cylinder axis direction (unit, points along increasing v).

x_ref: Vec3

First radial reference direction (unit; u = 0 points here).

y_ref: Vec3

Second radial reference direction (unit; axis × x_ref).

radius: f64

Cylinder radius.

v0: f64

Axial parameter at the lower trim boundary.

v1: f64

Axial parameter at the upper trim boundary.

u0: f64

Angular parameter at the start of the trim (radians).

u1: f64

Angular parameter at the end of the trim (radians); u1 - u0 == 2π for a full cylinder.

Implementations

impl CylinderDescriptor

pub fn evaluate(&self, u: f64, v: f64) -> Point3

World-space point on the surface at parameters (u, v), the same parameterization the GPU shader evaluates: pos(u, v) = axis_origin + radius·(cos u · x_ref + sin u · y_ref) + v·axis.

Note this returns an absolute world point; the GPU emits it minus center (RTC). Used to compute the descriptor’s AABB and available for CPU-side geometric checks.

pub fn triangle_count(tess: TessFactor) -> usize

Number of triangles a given tessellation factor produces (2·n_u·n_v).

Trait Implementations

impl Clone for CylinderDescriptor

fn clone(&self) -> CylinderDescriptor

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for CylinderDescriptor

impl Debug for CylinderDescriptor

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

Formats the value using the given formatter.