Vectors¶
The Vec2, Vec3, Vec4 classes implement vectors in 2,
3 and four dimensions. They support basic arithmetic via overloaded operators.
Essentially, the following basic operations are available:
- adding and subtracting two vectors
- negation
- multiplying and dividing by scalar value
This is shown in the following example:
vec_a=geom.Vec2(1, 0)
vec_b=geom.Vec2(0, 1)
print vec_a, vec_b
print vec_a+vec_b
print vec_a*3-vec_b
The standard vector operations are implemented as free standing functions:
vec_a=geom.Vec3(1, 0, 0)
vec_b=geom.Vec3(0, 1, 0)
print geom.Dot(vec_a, vec_b)
print geom.Cross(vec_a, vec_b)
print geom.Normalize(geom.Vec3(1, 1, 0))
print geom.Length(geom.Vec3(1, 1, 1))
Vector Classes¶
-
class
Vec2([x=0.0, y=0.0, z=0.0])¶ -
class
Vec2(vec) Real-valued vector in 2 dimensions.
Parameters: - x (float or int) – x coordinate
- y (float or int) – y coordinate
- vec (Vec2, Vec3 or Vec4) – the coordinates are set to the coordinates of vec. If vec is a
Vec2, the coordinates are copied directly, If vec is aVec3, the x and y coordinates are set to the coordinates of vec and z is silently swallowed. If vec is of typeVec4, x and y are divided by the homogenous coordinate w, raising a DivideByZeroException when w is zero.
-
x¶ The x-coordinate of the vector.
Type: float
-
y¶ The y-coordinate of the vector.
-
class
Vec3([x=0.0, y=0.0, z=0.0])¶ -
class
Vec3(vec) Real-valued vector in 3 dimensions.
Parameters: - x – x coordinate
- y – y coordinate
- z – z coordinate
- vec (Vec2, Vec3 or Vec4) – the coordinates are set to the coordinates of vec. If vec is a
Vec3, the coordinates are copied directly, If vec is aVec2, the x and y coordinates are set to the coordinates of vec and z is initialized to zero. If vec is of typeVec4, x, y and z are divided by homogenous coordinate w, raising a DivideByZeroException when w is zero.
-
x¶ The x-coordinate of the vector.
Type: float or int
-
y¶ The y-coordinate of the vector.
Type: float or int
-
z¶ The z-coordinate of the vector.
Type: float or int
-
class
Vec4([x=0.0, y=0.0, z=0.0, w=1.0])¶ -
class
Vec4(vec) Real-valued vector in 4 dimensions.
Parameters: - x (float or int) – x coordinate
- y (float or int) – y coordinate
- z (float or int) – z coordinate
- w (float or int) – w (homogenous) coordinate
- vec – the coordinates are set to the coordinates of vec. If vec is a
Vec4, the coordinates are copied directly, If vec is aVec2, the x and y coordinates are set to the coordinates of vec and z and w are initialized to 0 and 1, respectively. If vec is of typeVec4, x, y and z are divided by homogenous coordinate w, raising a DivideByZeroException when w is zero.
-
x¶ The x-coordinate of the vector.
Type: float or int
-
y¶ The y-coordinate of the vector.
Type: float or int
-
z¶ The z-coordinate of the vector.
Type: float or int
-
w¶ The homogenous coordinate.
Type: float or int
Functions Operating on Vectors¶
-
Cross(vec_a, vec_b)¶ Cross product of vec_a and vec_b
-
Dot(vec_a, vec_b)¶ Dot (scalar) product of vec_a and vec_b
Parameters:
-
Length(vec)¶ Length of vector
Parameters: vec (Vec2, Vec3 or Vec4) –
-
Length2(vec)¶ Returns the squared length of vec
Parameters: vec (Vec2, Vec3 or Vec4) –
-
Normalize(vec)¶ Returns a normalized version of vec
Parameters: vec (Vec2, Vec3 or Vec4) – Vector to be normalized