Module: Ra::Tuple

Defined in:
lib/ra/tuple.rb

Overview

A Tuple can classify a Vector as a POINT or VECTOR. For example:

point = Vector[x = 1, y = 2, z = 3, w = Ra::Tuple::POINT]
vector = Vector[x = 1, y = 2, z = 3, w = Ra::Tuple::VECTOR]

Constant Summary collapse

POINT = 
1
VECTOR = 
0

Class Method Summary collapse

Class Method Details

.cross(source, target) ⇒ Vector

Parameters:

  • source (Vector)
  • target (Vector)

Returns:

  • (Vector) 


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# File 'lib/ra/tuple.rb', line 15

def self.cross(source, target)
  cross = Vector[source[0], source[1], source[2]].cross(Vector[target[0], target[1], target[2]])

  Vector[
    cross[0],
    cross[1],
    cross[2],
    Tuple::VECTOR,
  ]
end

.reflect(vector, normal) ⇒ Vector

Parameters:

  • vector (Vector)
  • normal (Vector)

Returns:

  • (Vector) 


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# File 'lib/ra/tuple.rb', line 29

def self.reflect(vector, normal)
  vector - (normal * 2 * vector.dot(normal))
end