Class: Mittsu::Vector4
Constant Summary
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- ELEMENTS =
{ x: 0, y: 1, z: 2, w: 3 }
- DIMENSIONS =
ELEMENTS.count
Instance Attribute Summary
Attributes inherited from Vector
#elements, #index, #uv
Instance Method Summary
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Methods inherited from Vector
#==, #[], #[]=, #add, #add_scalar, #add_vectors, #angle_to, #ceil, #clamp, #clamp_scalar, #clone, #copy, #distance_to, #divide, #each_dimension, #floor, #from_array, #length, #length_sq, #lerp, #lerp_vectors, #max, #min, #multiply, #multiply_scalar, #multiply_vectors, #negate, #normalize, #project_on_plane, #project_on_vector, #reflect, #round, #round_to_zero, #set_length, #sub, #sub_scalar, #sub_vectors, #to_array, #to_s
Constructor Details
#initialize(x = 0, y = 0, z = 0, w = 1) ⇒ Vector4
Returns a new instance of Vector4.
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# File 'lib/mittsu/math/vector4.rb', line 8
def initialize(x = 0, y = 0, z = 0, w = 1)
super [x.to_f, y.to_f, z.to_f, w.to_f]
end
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Instance Method Details
#apply_matrix4(m) ⇒ Object
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# File 'lib/mittsu/math/vector4.rb', line 26
def apply_matrix4(m)
_x, _y, _z, _w = *@elements
e = m.elements
@elements[0] = e[0] * _x + e[4] * _y + e[8] * _z + e[12] * _w
@elements[1] = e[1] * _x + e[5] * _y + e[9] * _z + e[13] * _w
@elements[2] = e[2] * _x + e[6] * _y + e[10] * _z + e[14] * _w
@elements[3] = e[3] * _x + e[7] * _y + e[11] * _z + e[15] * _w
self
end
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#divide_scalar(scalar) ⇒ Object
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# File 'lib/mittsu/math/vector4.rb', line 36
def divide_scalar(scalar)
if scalar != 0.0
inv_scalar = 1.0 / scalar
@elements[0] *= inv_scalar
@elements[1] *= inv_scalar
@elements[2] *= inv_scalar
@elements[3] *= inv_scalar
else
@elements = [0.0, 0.0, 0.0, 1.0]
end
self
end
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#dot(v) ⇒ Object
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# File 'lib/mittsu/math/vector4.rb', line 146
def dot(v)
x * v.x + y * v.y + z * v.z + w * v.w
end
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#from_attribute(attribute, index, offset = 0) ⇒ Object
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# File 'lib/mittsu/math/vector4.rb', line 154
def from_attribute(attribute, index, offset = 0)
index = index * attribute.itemSize + offset
@elements[0] = attribute.array[index]
@elements[1] = attribute.array[index + 1]
@elements[2] = attribute.array[index + 2]
@elements[3] = attribute.array[index + 3]
self
end
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#length_manhattan ⇒ Object
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# File 'lib/mittsu/math/vector4.rb', line 150
def length_manhattan
x.abs + y.abs + z.abs + w.abs
end
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#set(x, y, z, w) ⇒ Object
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# File 'lib/mittsu/math/vector4.rb', line 12
def set(x, y, z, w)
super [x.to_f, y.to_f, z.to_f, w.to_f]
end
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#set_axis_angle_from_quaternion(q) ⇒ Object
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# File 'lib/mittsu/math/vector4.rb', line 49
def set_axis_angle_from_quaternion(q)
@elements[3] = 2.0 * ::Math.acos(q.w)
s = ::Math.sqrt(1.0 - q.w * q.w)
if s < 0.0001
@elements[0] = 1.0
@elements[1] = 0.0
@elements[2] = 0.0
else
@elements[0] = q.x / s
@elements[1] = q.y / s
@elements[2] = q.z / s
end
self
end
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#set_axis_angle_from_rotation_matrix(m) ⇒ Object
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# File 'lib/mittsu/math/vector4.rb', line 66
def set_axis_angle_from_rotation_matrix(m)
angle, x1, y1, z1 = nil epsilon = 0.01 epsilon2 = 0.1 te = m.elements
m11, m12, m13 = te[0], te[4], te[8]
m21, m22, m23 = te[1], te[5], te[9]
m31, m32, m33 = te[2], te[6], te[10]
if (((m12 - m21).abs < epsilon) &&
((m13 - m31).abs < epsilon) &&
((m23 - m32).abs < epsilon))
if (((m12 + m21).abs < epsilon2) &&
((m13 + m31).abs < epsilon2) &&
((m23 + m32).abs < epsilon2) &&
((m11 + m22 + m33 - 3).abs < epsilon2))
@elements = [1.0, 0.0, 0.0, 0.0]
return self end
angle = ::Math::PI
xx = (m11 + 1.0) / 2.0
yy = (m22 + 1.0) / 2.0
zz = (m33 + 1.0) / 2.0
xy = (m12 + m21) / 4.0
xz = (m13 + m31) / 4.0
yz = (m23 + m32) / 4.0
if (xx > yy) && (xx > zz) if xx < epsilon
x1 = 0.0
y1 = 0.707106781
z1 = 0.707106781
else
x1 = ::Math.sqrt(xx)
y1 = xy / x1
z1 = xz / x1
end
elsif yy > zz if yy < epsilon
x1 = 0.707106781
y1 = 0.0
z1 = 0.707106781
else
y1 = ::Math.sqrt(yy)
x1 = xy / y1
z1 = yz / y1
end
else if zz < epsilon
x1 = 0.707106781
y1 = 0.707106781
z1 = 0.0
else
z1 = ::Math.sqrt(zz)
x1 = xz / z1
y1 = yz / z1
end
end
@elements = [x1, y1, z1, angle]
return self end
s = ::Math.sqrt((m32 - m23) * (m32 - m23) +
(m13 - m31) * (m13 - m31) +
(m21 - m12) * (m21 - m12)) s = 1.0 if (s.abs < 0.001)
@elements[0] = (m32 - m23) / s
@elements[1] = (m13 - m31) / s
@elements[2] = (m21 - m12) / s
@elements[3] = ::Math.acos((m11 + m22 + m33 - 1.0) / 2.0)
self
end
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#w ⇒ Object
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# File 'lib/mittsu/math/vector4.rb', line 19
def w; @elements[3]; end
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#w=(value) ⇒ Object
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# File 'lib/mittsu/math/vector4.rb', line 24
def w=(value); @elements[3] = value.to_f; end
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#x ⇒ Object
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# File 'lib/mittsu/math/vector4.rb', line 16
def x; @elements[0]; end
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#x=(value) ⇒ Object
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# File 'lib/mittsu/math/vector4.rb', line 21
def x=(value); @elements[0] = value.to_f; end
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#y ⇒ Object
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# File 'lib/mittsu/math/vector4.rb', line 17
def y; @elements[1]; end
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#y=(value) ⇒ Object
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# File 'lib/mittsu/math/vector4.rb', line 22
def y=(value); @elements[1] = value.to_f; end
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#z ⇒ Object
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# File 'lib/mittsu/math/vector4.rb', line 18
def z; @elements[2]; end
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#z=(value) ⇒ Object
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# File 'lib/mittsu/math/vector4.rb', line 23
def z=(value); @elements[2] = value.to_f; end
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