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import numpy as np
import example_robot_data as erd
import pinocchio as pin
class problemDataAbstract:
def __init__(self, param, frozen_names = []):
self.dt = param.dt_mpc # OCP dt
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self.T = self.init_steps + self.target_steps -1
self.robot = erd.load("solo12")
self.q0 = self.robot.q0
self.q0[7:] = param.q_init
self.model = self.robot.model
self.rdata = self.model.createData()
self.collision_model = self.robot.collision_model
self.visual_model = self.robot.visual_model
self.frozen_names = frozen_names
if frozen_names:
self.frozen_idxs = [self.model.getJointId(id) for id in frozen_names]
self.freeze()
self.nq = self.model.nq
self.nv = self.model.nv
self.nx = self.nq + self.nv
self.ndx = 2*self.nv
self.nu = 12 - len(frozen_names) + 1 if len(frozen_names) != 0 else 12 # -1 to take into account the freeflyer
self.ntau = self.nv
self.effort_limit = np.ones(self.nu) *3
self.v0 = np.zeros(18)
self.x0 = np.concatenate([self.q0, self.v0])
self.u0 = np.zeros(self.nu)
self.xref = self.x0
self.uref = self.u0
self.lfFoot, self.rfFoot, self.lhFoot, self.rhFoot = 'FL_FOOT', 'FR_FOOT', 'HL_FOOT', 'HR_FOOT'
self.cnames = [self.lfFoot, self.rfFoot, self.lhFoot, self.rhFoot]
self.allContactIds = [ self.model.getFrameId(f) for f in self.cnames]
self.lfFootId = self.model.getFrameId(self.lfFoot)
self.rfFootId = self.model.getFrameId(self.rfFoot)
self.lhFootId = self.model.getFrameId(self.lhFoot)
self.rhFootId = self.model.getFrameId(self.rhFoot)
self.Rsurf = np.eye(3)
def freeze(self):
geom_models = [self.visual_model, self.collision_model]
self.model, geometric_models_reduced = pin.buildReducedModel(
self.model,
list_of_geom_models=geom_models,
list_of_joints_to_lock=self.frozen_idxs,
reference_configuration=self.q0)
self.rdata = self.model.createData()
self.visual_model = geometric_models_reduced[0]
self.collision_model = geometric_models_reduced[1]
class ProblemData(problemDataAbstract):
def __init__(self, param):
super().__init__(param)
self.useFixedBase = 0
# Cost function weights
self.mu = 0.7
self.foot_tracking_w = 1e2
self.friction_cone_w = 1e3
self.control_bound_w = 1e3
self.state_reg_w = np.array([0] * 3 \
+ [1e1] * 3 \
+ [1e0] * 3 \
+ [1e-3] * 3\
+ [1e0] * 6
+ [0] * 6 \
+ [1e1] * 3 \
+ [1e1] * 6 )
self.terminal_velocity_w = np.array([0] * 18 + [1e3] * 18 )
self.control_bound_w = 1e3
self.x0 = np.array([ 0.0, 0.0, 0.2607495, 0, 0, 0, 1,
0, 0.7, -1.4,
0. , 0.7, -1.4,
0. , -0.7, 1.4,
0. , -0.7, 1.4,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0]) # x0 got from PyBullet
self.u0 = np.array([-0.02615051, -0.25848605, 0.51696646,
0.0285894 , -0.25720605, 0.51441775,
-0.02614404, 0.25848271, -0.51697107,
0.02859587, 0.25720939, -0.51441314]) # quasi static control
self.xref = self.x0
self.uref = self.u0
class ProblemDataFull(problemDataAbstract):
def __init__(self, param):
frozen_names = ["root_joint", "FL_HAA", "FL_HFE", "FL_KFE",
"HL_HAA", "HL_HFE", "HL_KFE",
"HR_HAA", "HR_HFE", "HR_KFE" ]
super().__init__(param, frozen_names)
self.useFixedBase = 1
self.x0_reduced = np.concatenate([self.q0_reduced, self.v0_reduced])