Archives for: July 2012


Permalink 18:53:44, Categories: GSoC 2012  

Further R&D Updates, and Concern Regarding PcSteer

Hello CrystalSpace,
This week I have been focussed almost entirely on celPcSteer, celPcPathFinder, celHPath and celHNavStruct. I have spent more time than I care to admit trying to get my head around these, but before I get into my concerns regarding this I would like to briefly comment on the positive outcomes of this week. In particular:

- Revision 4933, which fixes the problems I mentioned in my update to last week's post when saving/loading navmeshes with the new R&D library. These are now resolved, with no changes to the CEL api and so all existing apps using R&D should be able to now use the latest available version of the library.

- Revision 4936 switches to creating NavMeshes in parallel. On my single-core machine this causes a significant slow down. To avoid this, users with a single-core machine can call the thread manager's SetAlwaysRunNow method with true passed as the sole argument. An example of this is included in the message attached to this revision. On multi-core machines this should be faster, any readers with a multi-core machine and willing to test this are greatly encouraged to join in this discussion on the mailing list.(Updated 30/07/2012)

Moving back to my work on integrating R&D into PcSteer, I have noticed significant redundancy between the classes celPcSteer, celPcPathFinder, celHPath and celHNavStruct. In particular celPcPathFinder and celHPath both seem to be designed to create high level paths between sectors. The exception being that celPcPathFinder also includes steering behaviours. I think these classes could do with a significant refactoring. I see no purpose to celPcPathFinder now that we have celHPath. Instead I think celPcSteer should be tidied up, made to use celHNavStruct and some of the functionality from celPcPathFinder included (i.e. cyclic and two way paths.)

Furthermore, some of PcSteer is simply not functional - as noted as far back as revision 3391 by caedesv (Pablo?) This does not seem to have been resolved since but is probably beyond the scope of my summer project.

I also think there may be room for some links between DetourCrowd and the separation and cohesion methods of PcSteer. I have not looked into DetourCrowd sufficiently at this time to comment further on this, but perhaps this would also be a way to improve these plugins in the future.

Overall, I am trying to use this blog post to collate my views but am very keen to hear any feedback at this time regarding these suggested changes. Some of you may have reasons to keep celPcPathFinder for instance or a suggestion for a better refraction? My concern is that as it stands the overlap of these modules is unnecessary and makes choosing which to implement challenging.

Kind regards,


Permalink 16:37:33, Categories: GSoC 2012  

R&D Updated And Functional! :)

Hello CrystalSpace,
I'm very glad to announce that my problems with Google's website have been resolved and I have passed the midterm assessment. I am very grateful for all your support in this project and am enjoying the experience greatly.

This week has been a frustrating, learning experience getting very familiar with the MSVC debugger. My progress so far is that all necessary changes to accommodate the API changes in Recast and Detour(R&D) have been made (See r4930) and all previous changes made by Leonardo and others that were lost in the update have been reimplemented (See r4931).

Finally, revision r4932 fixes a few minor issues that were causing unexpected results when building a navmesh. As far as I have tested both appnavmeshtest and apppathfindingtest are again fully functional as of this update.

Next week my focus will shift towards allowing iPcSteer to use the functionality of these libraries. I will also need to reconsider (with my mentor) my schedule for the remainder of the project. If anyone has any comments on what should be our priorities please feel free to let me know.

Update: There seems to be some issues with saving and loading navmeshes still, I will make fixing these my first priority next week before moving on to iPcSteer.


Permalink 11:48:45, Categories: GSoC 2012  

The Midway Point

Hello CrystalSpace,
Well we've reached the midway point of the summer (although you wouldn't know from the weather here!) I've been having some trouble this week with the google website after completing my midterm assessment but hopefully this is not a significant problem and I will find out over the weekend if you are all sufficiently satisfied with my progress to continue.

I have begun this week to work on the Recast and Detour (R&D) part of my project. So far this has mainly consisted of getting familiar with the library and Leonardo's previous work implementing it into CEL. I have committed revision 4928 which updates the library files to r345 of R&D and have since tested them in msvc - they do not yet compile.

A number of changes need now to be made to cellnavmesh.h/cpp and cellhpf.h/cpp to accommodate the API changes in R&D since the previous version (187) used in Leonardo's work. In particular I have limited the necessary changes down to the following R&D blog posts:

detour-api-change 2010
detour-api-changes 2011

Once complete I may also need to (re)implement the following changes previous made to fit R&D into CEL:


I intend to work on these updates next week (provided the midterm has been passed successfully) with the aim to have the example apps appnavmeshtest and apppathfindingtest fully functional with the new plugin and latest R&D library by this time next week.


Permalink 11:46:23, Categories: GSoC 2012  

Load from XML Complete, Moving on to R&D

Hello CrystalSpace,
I have just committed the final deliverable for the behaviour tree (BT) portion of this GSoC project. As of revision 4927 BT's can now be loaded from XML. This functionality is also demonstrated in this revision of appbttest.

As mentioned last week this deliverable is slightly behind schedule, but at only 5 days late and given the significant improvements in the BT code, I hope you all agree that this part of the project has been a relative success - especially given that midterm evaluations are coming up next week! :)

I am taking a slightly long weekend, leaving shortly and returning Monday. Unfortunately I will be offline for all of this time. However please feel free to contact me if there are any suggestions regarding the code or the next stage of the project and I will get back to you asap Monday.

Next week I will begin work on the recast and detour code, but until then I hope you all have a good weekend.

July 2012
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