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Re: Prevent field event propogation?
#1
Guru
Guru


Cache the value before you return it and reuse the cached value instead of recalculating it if the input data did not change over a limit. You can have that limit as an input field to increase the control.

Or did you implement the whole msd as a routing network? I would definately recommend against that except as a pure academic exercise. I would recommend encapsulating the msd in a node.

Posted on: 2013/10/24 21:58
KJ Lundin Palmerius
C Research
Linköping University, Sweden
Top


Re: Novient Falcon
#2
Guru
Guru


There is a tool in Candy that you can use to interactively inspect and modify the scene graph using Python commands. It is very useful for testing the scene graph or updating without restart, but it cannot do anything more fancy than what an ordinary Python script can do. (It is actually a Python script.)

Posted on: 2013/10/21 21:17
KJ Lundin Palmerius
C Research
Linköping University, Sweden
Top


Re: Prevent field event propogation?
#3
Guru
Guru


Why would you want to stop the network from propagating the event? The event is just an information that something has happened and at that point there is no knowledge of what the field value will be in the case of an update. That is one of the fundamentals of the lazy evaluation used in the H3D event network.

Answer that question and we might be able to help you find an alternative solution.

Posted on: 2013/10/21 21:10
KJ Lundin Palmerius
C Research
Linköping University, Sweden
Top


Re: Suggestions for Tutorials
#4
Guru
Guru


A tutorial is never a replacement of good documentation, however good documentation is a very good replacement of tutorials. One way to improve the documentation could be to include one typical usage example in the documentation of each of the more advanced nodes.

Posted on: 2013/10/21 21:06
KJ Lundin Palmerius
C Research
Linköping University, Sweden
Top


Re: Stylus position changes with viewpoint node
#5
Guru
Guru


Use the CorrectViewpoint python script in the Candy package, or check the code to see what you need to do.

Posted on: 2013/10/11 14:06
KJ Lundin Palmerius
C Research
Linköping University, Sweden
Top


Re: Need to keep stylus from rotating when haptics device is rotated....
#6
Guru
Guru


There is a script for this in the Candy package. It's called CorrectViewpoint and does a few different things associated with this problem with the X3D standard. Also, there are a few other scripts that provide alternative methods for navigation around the virtual objects.

Posted on: 2013/10/11 14:05
KJ Lundin Palmerius
C Research
Linköping University, Sweden
Top


Re: Candy/HVR 2.0.0
#7
Guru
Guru


Do you compile Candy through H3D's meta-repository CMake configuration, as a "toolkit"? This is how I've tested it before release, however it should compile also stand-alone.

So you've set H3DUTIL_LIBRARY, H3DUTIL_DEBUG_LIBRARY and H3DUTIL_INCLUDE_DIR manually? I see that pthread has to be found as well, no error message about that?

Posted on: 2013/8/1 8:10
KJ Lundin Palmerius
C Research
Linköping University, Sweden
Top


Candy/HVR 2.0.0
#8
Guru
Guru


I've just submitted a new release of the Candy/HVR package. This new version is compatible with H3Ds CMake toolkit integration and contains a lot of other news, especially in the HVR part. Anyone who uses H3D for VR or AR applications can get help from the new tracking nodes and filter, and anyone can find other useful nodes, scripts and tools.

As the major release number indicates, this version is partly incompatible with earlier releases. Some nodes have changed name and some have changed interface or functionality.

Edit: link to download page.

Posted on: 2013/6/26 11:22
KJ Lundin Palmerius
C Research
Linköping University, Sweden
Top


Re: Adding support for devices
#9
Guru
Guru


So obviously I remembered wrong. In the upcoming release 2.0 of Candy, which I'm working on right now, the trackers have X3DChildNode as base. I just forgot that this had changed.

The reason it will be a major revision is because some nodes have been removed and other have changed their interfaces, so an upgrade might not be a simple switch. If you do not need the new filtering functionality, or any other new node, I'd recommend you to stay with the current release.

Posted on: 2013/6/12 9:27
KJ Lundin Palmerius
C Research
Linköping University, Sweden
Top


Re: Impenetrable surface
#10
Guru
Guru


You can also cheat by applying event-based haptic feedback, which will give a bit better feel even with an impedance control. It needs some advanced fine-tuning, however, such as device characterization and applying an inverse model transfer function. Check the literature for Kuchenbeckers work on event-based haptics in 2005.

Posted on: 2013/6/8 15:36
KJ Lundin Palmerius
C Research
Linköping University, Sweden
Top



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