Bug Report

[Milford Sandler]

Describe the bug | Bug描述
A clear and concise description of what the bug is.

void MotorComponent::calculateTargetPosition(const Vector3&& current_position)
{
Vector3 final_position;

    switch (m_controller_type)
    {
        case ControllerType::none:
            final_position = current_position + m_desired_displacement;
            break;
        case ControllerType::physics:
            final_position = m_controller->move(current_position, m_desired_displacement);
            break;
        default:
            final_position = current_position;
            break;
    }

    // Piccolo-hack: motor level simulating jump, character always above z-plane
    if (m_jump_state == JumpState::falling && final_position.z + m_desired_displacement.z <= 0.f)
    {
        final_position.z = 0.f;
        m_jump_state     = JumpState::idle;
    }

    m_is_moving       = (final_position - current_position).squaredLength() > 0.f;
    m_target_position = final_position;
}

此处position.z <= 0来判断角色是否已经落地，所以跳到别的物体上时，角色的状态一直是JumpState::falling，之后就无法再次跳跃了

Steps to reproduce | 如何复现
Steps to reproduce the behavior:

1. 跳到场景中的立方体上
2. 再次按空格键，无法起跳

有没有其他更好的办法判断玩家落地（或者落到其他物体上）？