anki-3d-engine/ThirdParty/Bullet/Extras/InverseDynamics/SimpleTreeCreator.cpp

#include "SimpleTreeCreator.hpp"

#include <cstdio>

namespace btInverseDynamics
{
/// minimal "tree" (chain)
SimpleTreeCreator::SimpleTreeCreator(int dim) : m_num_bodies(dim)
{
	m_mass = 1.0;
	m_body_T_parent_ref(0, 0) = 1;
	m_body_T_parent_ref(0, 1) = 0;
	m_body_T_parent_ref(0, 2) = 0;
	m_body_T_parent_ref(1, 0) = 0;
	m_body_T_parent_ref(1, 1) = 1;
	m_body_T_parent_ref(1, 2) = 0;
	m_body_T_parent_ref(2, 0) = 0;
	m_body_T_parent_ref(2, 1) = 0;
	m_body_T_parent_ref(2, 2) = 1;

	m_parent_r_parent_body_ref(0) = 1.0;
	m_parent_r_parent_body_ref(1) = 0.0;
	m_parent_r_parent_body_ref(2) = 0.0;

	m_body_r_body_com(0) = 0.5;
	m_body_r_body_com(1) = 0.0;
	m_body_r_body_com(2) = 0.0;

	m_body_I_body(0, 0) = 1;
	m_body_I_body(0, 1) = 0;
	m_body_I_body(0, 2) = 0;
	m_body_I_body(1, 0) = 0;
	m_body_I_body(1, 1) = 1;
	m_body_I_body(1, 2) = 0;
	m_body_I_body(2, 0) = 0;
	m_body_I_body(2, 1) = 0;
	m_body_I_body(2, 2) = 1;

	m_axis(0) = 0;
	m_axis(1) = 0;
	m_axis(2) = 1;
}
int SimpleTreeCreator::getNumBodies(int* num_bodies) const
{
	*num_bodies = m_num_bodies;
	return 0;
}

int SimpleTreeCreator::getBody(const int body_index, int* parent_index, JointType* joint_type,
							   vec3* parent_r_parent_body_ref, mat33* body_T_parent_ref,
							   vec3* body_axis_of_motion, idScalar* mass, vec3* body_r_body_com,
							   mat33* body_I_body, int* user_int, void** user_ptr) const
{
	*parent_index = body_index - 1;
	if (body_index % 2)
	{
		*joint_type = PRISMATIC;
	}
	else
	{
		*joint_type = REVOLUTE;
	}
	*parent_r_parent_body_ref = m_parent_r_parent_body_ref;
	if (0 == body_index)
	{
		(*parent_r_parent_body_ref)(2) = 1.0;
	}
	*body_T_parent_ref = m_body_T_parent_ref;
	*body_axis_of_motion = m_axis;
	*mass = m_mass;
	*body_r_body_com = m_body_r_body_com;
	*body_I_body = m_body_I_body;
	*user_int = 0;
	*user_ptr = 0;
	return 0;
}
}  // namespace btInverseDynamics