Returns the opposite vector
Usage
antipode(x, ...)
# Default S3 method
antipode(x, ...)
# S3 method for class 'Vec3'
antipode(x, ...)
# S3 method for class 'Line'
antipode(x, ...)
# S3 method for class 'Ray'
antipode(x, ...)
# S3 method for class 'Plane'
antipode(x, ...)
# S3 method for class 'Pair'
antipode(x, ...)
# S3 method for class 'Fault'
antipode(x, ...)