Search found 7 matches

by Jan Grutters
Mon Nov 16, 2020 2:47 am
Forum: OpenSim
Topic: Extracting positions of CoM body segments w.r.t. ground reference frame
Replies: 4
Views: 495

Re: Extracting positions of CoM body segments w.r.t. ground reference frame

Ahhh one sec.

You just have to add them. (But donnot forget about taking the orientation into account ;) )

Thank you for your insight!!

Best,

Jan
by Jan Grutters
Mon Nov 16, 2020 2:02 am
Forum: OpenSim
Topic: Extracting positions of CoM body segments w.r.t. ground reference frame
Replies: 4
Views: 495

Re: Extracting positions of CoM body segments w.r.t. ground reference frame

Dear Nicos, Thank you for your response. I donnot really see how this would work. Firstly, myBody.getMassCentre() returns a Vec3 object providing me the position of the center of mass defined by the .osim model. I donnot get how the getPositionInGround() function can be used to transform this positi...
by Jan Grutters
Sun Nov 15, 2020 1:51 pm
Forum: OpenSim
Topic: Extracting positions of CoM body segments w.r.t. ground reference frame
Replies: 4
Views: 495

Extracting positions of CoM body segments w.r.t. ground reference frame

Dear OpenSim Experts, I trying to extract the positions of the center of masses for each body segment (e.g.: torso/toes_l) in my model with respect to the ground reference frame. Currently, I am using getPositionInGround(), however I believe that this gives the position of the body reference frame w...
by Jan Grutters
Tue Nov 10, 2020 9:15 am
Forum: SCONE
Topic: Using SCONE excitations for forward dynamics in OpenSim
Replies: 6
Views: 449

Re: Using SCONE excitations for forward dynamics in OpenSim

Ahh okay,

Thank you for your help!
by Jan Grutters
Tue Nov 10, 2020 8:28 am
Forum: SCONE
Topic: Using SCONE excitations for forward dynamics in OpenSim
Replies: 6
Views: 449

Re: Using SCONE excitations for forward dynamics in OpenSim

Hi Thomas, Thank you for your response. You are right about that the simulation does not have to be 100% perfect to train the policy, as this will be solved by the reinforcement learning part. However, it would improve the performance of my algorithm if the excitations of SCONE would directly transl...
by Jan Grutters
Tue Oct 27, 2020 7:49 am
Forum: SCONE
Topic: Using SCONE excitations for forward dynamics in OpenSim
Replies: 6
Views: 449

Re: Using SCONE excitations for forward dynamics in OpenSim

Hi Thomas, Thank you for your response. [*] I checked the Data Output Frequency versus fixed_control_step_size, they were equal. Lowering the fixed_control_step_size/increasing the Data Output Frequency improved the forward dynamics in OpenSim. [*] I checked the initial conditions and used the first...
by Jan Grutters
Thu Oct 22, 2020 2:56 am
Forum: SCONE
Topic: Using SCONE excitations for forward dynamics in OpenSim
Replies: 6
Views: 449

Using SCONE excitations for forward dynamics in OpenSim

Hi Thomas, For my project I am trying to do a forward dynamics simulation from standstill to walking in OpenSim 3.3. Therefore, I used SCONE to optimize a scenario for performing this task. Using the SCONE excitations from the .sto output I want to do a forward dynamics simulation on the same model ...