manyfold3d/mittsu-mesh_analysis

$LOAD_PATH.unshift File.expand_path("../lib", __dir__)

require "mittsu"
require "mittsu/mesh_analysis"
require "mittsu/opengl"

SCREEN_WIDTH = 800
SCREEN_HEIGHT = 600
ASPECT = SCREEN_WIDTH.to_f / SCREEN_HEIGHT.to_f

scene = Mittsu::Scene.new
camera = Mittsu::PerspectiveCamera.new(75.0, ASPECT, 0.1, 1000.0)

mesh = Mittsu::MeshAnalysis::ProgressiveMesh.new(
  Mittsu::TorusKnotGeometry.new(2, 0.8, 64, 16),
  Mittsu::MeshLambertMaterial.new(color: 0x800080)
)
# Turn 75% of the mesh into a progressive vertex stream
puts "Calculating progressive vertex stream"
mesh.progressify ratio: 0.75
puts " ... done"
scene.add(mesh)

light = Mittsu::DirectionalLight.new(0xffffff, 1)
light.position.set(0.9, 0.9, 1)
light_object = Mittsu::Object3D.new
light_object.add(light)
scene.add(light_object)

ambient = Mittsu::AmbientLight.new(0x3f3f3f)
ambient_object = Mittsu::Object3D.new
ambient_object.add(ambient)
scene.add(ambient_object)

camera_container = Mittsu::Object3D.new
camera_container.add(camera)
camera.position.z = 5.0
scene.add(camera_container)

renderer = Mittsu::OpenGL::Renderer.new width: SCREEN_WIDTH, height: SCREEN_HEIGHT, title: "Progressive mesh refinement (WIP)"

renderer.window.on_resize do |width, height|
  renderer.set_size(width, height)
  camera.aspect = width.to_f / height.to_f
  camera.update_projection_matrix
end

X_AXIS = Mittsu::Vector3.new(1.0, 0.0, 0.0)
Y_AXIS = Mittsu::Vector3.new(0.0, 1.0, 0.0)
mouse_delta = Mittsu::Vector2.new
last_mouse_position = Mittsu::Vector2.new

renderer.window.on_mouse_button_pressed do |button, position|
  if button == GLFW::MOUSE_BUTTON_LEFT
    last_mouse_position.copy(position)
  end
end

renderer.window.on_mouse_move do |position|
  if renderer.window.mouse_button_down?(GLFW::MOUSE_BUTTON_LEFT)
    mouse_delta.copy(last_mouse_position).sub(position)
    last_mouse_position.copy(position)
    camera_container.rotate_on_axis(Y_AXIS, mouse_delta.x * 0.01)
    camera_container.rotate_on_axis(X_AXIS, mouse_delta.y * 0.01)
  end
end

renderer.window.run do
  renderer.render(scene, camera)
end