class Mittsu::RingGeometry

Public Class Methods

new(inner_radius = 0.0, outer_radius = 50.0, theta_segments = 8, phi_segments = 8, theta_start = 0.0, theta_length = (::Math::PI * 2.0)) click to toggle source
Calls superclass method Mittsu::Geometry::new
# File lib/mittsu/extras/geometries/ring_geometry.rb, line 6
def initialize(inner_radius = 0.0, outer_radius = 50.0, theta_segments = 8, phi_segments = 8, theta_start = 0.0, theta_length = (::Math::PI * 2.0))
  super()

  @type = 'RingGeometry'

  @parameters = {
    inner_radius:   inner_radius,
    outer_radius:   outer_radius,
    theta_segments: theta_segments,
    phi_segments:   phi_segments,
    theta_start:    theta_start,
    theta_length:   theta_length
  }

  theta_segments = [3, theta_segments].max
  phi_segments = [1, phi_segments].max

  uvs = []
  radius = inner_radius
  radius_step = ((outer_radius - inner_radius) / phi_segments.to_f)

  for i in 0..phi_segments do # concentric circles inside ring
    for o in 0..theta_segments do # number of segments per circle
      vertex = Vector3.new
      segment = theta_start + o.to_f / theta_segments.to_f * theta_length
      vertex.x = radius * ::Math.cos(segment)
      vertex.y = radius * ::Math.sin(segment)

      @vertices << vertex
      uvs << Vector2.new((vertex.x / outer_radius + 1.0) / 2.0, (vertex.y / outer_radius + 1.0) / 2.0)
    end

    radius += radius_step
  end

  n = Vector3.new(0.0, 0.0, 1.0)

  for i in 0...phi_segments do # concentric circles inside ring
    theta_segment = i * (theta_segments + 1)

    for o in 0...theta_segments do # number of segments per circle
      segment = o + theta_segment

      v1 = segment
      v2 = segment + theta_segments + 1
      v3 = segment + theta_segments + 2

      @faces << Face3.new(v1, v2, v3, [n.clone, n.clone, n.clone])
      @face_vertex_uvs[0] << [uvs[v1].clone, uvs[v2].clone, uvs[v3].clone]

      v1 = segment
      v2 = segment + theta_segments + 2
      v3 = segment + 1

      @faces << Face3.new(v1, v2, v3, [n.clone, n.clone, n.clone])
      @face_vertex_uvs[0] << [uvs[v1].clone, uvs[v2].clone, uvs[v3].clone]
    end
  end

  compute_face_normals
  @bounding_sphere = Sphere.new(Vector3.new, radius)
end

Public Instance Methods

clone() click to toggle source
# File lib/mittsu/extras/geometries/ring_geometry.rb, line 69
def clone
  RingGeometry.new(
    @parameters[:inner_radius],
    @parameters[:outer_radius],
    @parameters[:theta_segments],
    @parameters[:phi_segments],
    @parameters[:theta_start],
    @parameters[:theta_length]
  )
end