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Get dynamic World Pose of a link [closed]

asked 2022-03-07 11:39:38 -0600

jl gravatar image

Hey guys

i am struggling to get the dynamic world pose of a link. I have written a plugin, which computes the distance to certain objects in the world. Therefore i need to know the World pose of different links in a model which is moving. To get the world Pose of a link i have done this in the OnUpdate() function:

physics::Link_V links= this->world->ModelByName("desk_0")->GetLinks();
for (physics::Link_V::iterator iter = links.begin(); iter !=links.end(); ++iter){
  if((*iter)->GetName().find(this->anchorPrefix) == 0){
      physics::LinkPtr anchor = *iter;
      ignition::math::Pose3d anchorPose = anchor->GetWorldPose();
RCLCPP_INFO(ros_node->get_logger(), "Anchor Pose: %s: x: %f, y: %f, z: %f", (*iter)->GetName().c_str(), anchorPose.Pos().X(), anchorPose.Pos().Y(), anchorPose.Pos().Z());

As expected, i get the world pose of the different links, but the pose is not changing if i move the model around in the world. The model is not static, only the gravity for those specific "anchor"-links is disabled. I also disabled the auto disable function (<allow_auto_disable>0</allow_auto_disable>) for the model.

I hope somebody could give me a hint what i could have done wrong or an alternative approach to get the World pose.

Thanks in advance Jannis

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Closed for the following reason the question is answered, right answer was accepted by jl
close date 2022-03-08 04:35:14.563943

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answered 2022-03-08 04:34:32 -0600

jl gravatar image

I finally found it out myself: Problem was that i didn't connected the links through fixed joints with the base link of the model. So they were not moving if i move the model.

Hope this helps someone sometime.

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Asked: 2022-03-07 11:39:38 -0600

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Last updated: Mar 07 '22