A simple vector math module, suitable for use in Maya python for those who want to avoid Pymel. Technically it will work for any vector math but I'd recommend using a C-based alternative (such as numpy for any application with hard-core performance constraints.
The module is a single python file (vector.py) which depends only on the standard library. Just drop it into any folder on your python path (either site-packages or another and import it:
from Vector import Vector2, Vector3
There are 3 base vector classes:
- Vector2 is a 2-d XY vector.
- Vector3 is a 3-d XYZ vector.
- Vector4 is a 4-d XYZW vector.
Typical usage would be:
v = Vector2 ( 1.0, 0.0)
or using *args on existting iterable:
example = [1.0., 0.0] # any iterable with 2 items
v = Vector2(*example)
or assigning explicitly.
example = Vector2(x = 1.0, y=2.0)
You can create integer or float versions by providing integers or floats at start (the math will follow the usual python float/vector rules). VectorN classes are tuples, so they are immutable - you cannot assign to their values after they are created.
####addition:
Vector2(1,0) + Vector2(0, 1)
# Vector2(x=1,y=1)
####subtraction:
Vector2(1,1) - Vector2(0, 1)
# Vector2(x=1, y=0)
####multiplication:
if the second argument is a vector, do a piecewise vector multiplication:
Vector2(1,1) * Vector2(2, 3)
# Vector2(x=2, y=3)
If the second argument is a single number, do a scalar multiplication:
Vector2(1,1) * 3
# Vector2(x=3 ,y=3)
####division
if the second argument is a vector, do a piecewise vector division:
Vector2(2.0, 4.0) / Vector2(4, 2)
# Vector2(x = .5, y=2.0)
If the second argument is a single number, do a scalar division:
Vector2(4.0, 4.0) / 2
# Vector2(x=2.0, y=2.0)
####length():
Returns the length of a vector:
Vector2(3, 4).length()
# 5
####normalized():
Returns a normalized copy of the vector.
Vector2(3, 4).normalized()
# Vector2(.8, .6)
####dot(): Returns the dot product of two vectors:
Vector2(1,0).dot(Vector2(.707, .707))
# .707