bindings_kinematics.py

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import unittest
import pinocchio as pin
import numpy as np
 
from test_case import PinocchioTestCase
 
 
class TestKinematicsBindings(PinocchioTestCase):
    def setUp(self):
        self.model = pin.buildSampleModelHumanoidRandom()
        self.joint_idx = (
            self.model.getJointId("rarm2_joint")
            if self.model.existJointName("rarm2_joint")
            else (self.model.njoints - 1)
        )
 
    def test_getters(self):
        data = self.model.createData()
        q = pin.randomConfiguration(self.model)
        v = np.random.rand(self.model.nv)
        a = np.random.rand(self.model.nv)
        pin.forwardKinematics(self.model, data, q, v, a)
 
        T = data.oMi[self.joint_idx]
 
        v = pin.getVelocity(self.model, data, self.joint_idx)
        self.assertApprox(v, data.v[self.joint_idx])
        v = pin.getVelocity(self.model, data, self.joint_idx, pin.ReferenceFrame.LOCAL)
        self.assertApprox(v, data.v[self.joint_idx])
        v = pin.getVelocity(self.model, data, self.joint_idx, pin.ReferenceFrame.WORLD)
        self.assertApprox(v, data.oMi[self.joint_idx].act(data.v[self.joint_idx]))
        v = pin.getVelocity(
            self.model, data, self.joint_idx, pin.ReferenceFrame.LOCAL_WORLD_ALIGNED
        )
        self.assertApprox(
            v, pin.SE3(T.rotation, np.zeros(3)).act(data.v[self.joint_idx])
        )
 
        a = pin.getAcceleration(self.model, data, self.joint_idx)
        self.assertApprox(a, data.a[self.joint_idx])
        a = pin.getAcceleration(
            self.model, data, self.joint_idx, pin.ReferenceFrame.LOCAL
        )
        self.assertApprox(a, data.a[self.joint_idx])
        a = pin.getAcceleration(
            self.model, data, self.joint_idx, pin.ReferenceFrame.WORLD
        )
        self.assertApprox(a, data.oMi[self.joint_idx].act(data.a[self.joint_idx]))
        a = pin.getAcceleration(
            self.model, data, self.joint_idx, pin.ReferenceFrame.LOCAL_WORLD_ALIGNED
        )
        self.assertApprox(
            a, pin.SE3(T.rotation, np.zeros(3)).act(data.a[self.joint_idx])
        )
 
        a = pin.getClassicalAcceleration(self.model, data, self.joint_idx)
        a = pin.getClassicalAcceleration(
            self.model, data, self.joint_idx, pin.ReferenceFrame.LOCAL
        )
        a = pin.getClassicalAcceleration(
            self.model, data, self.joint_idx, pin.ReferenceFrame.WORLD
        )
        a = pin.getClassicalAcceleration(
            self.model, data, self.joint_idx, pin.ReferenceFrame.LOCAL_WORLD_ALIGNED
        )
 
 
if __name__ == "__main__":
    unittest.main()