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| Forum search engine underpowered? |
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Posted by: Philippe Hurbain - 2017-02-02, 14:02 - Forum: Website Suggestions/Requests/Discussion
- Replies (3)
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I was trying to find again this post, so I keyed in "ldcad tread long" in the search field that returned nothing (though all these words ARE in the post). Of course I didn't remember the exact words used so I tried many variants, without any success. Finally I called Google to the rescue, and "ldcad tread long site:ldraw.org" cheerfully gave me the right post (I tried variants there too and many of them gave the right answer despite the exact words were not in the post...)
Ideas to improve?
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| LDraw.org Forums, Wiki, and OMR switching to https only |
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Posted by: Orion Pobursky - 2017-02-01, 18:13 - Forum: LDraw.org Announcements
- Replies (1)
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I will be slowly switching the LDraw.org Forums, Wiki, and OMR over to https over the next few weeks. The main site won't switch since it resides on the different server so I have to do some more research. Unfortunately, due to the certificate we're using, if you're still using Win XP or an old browser it may throw an error or just won't work for you.
P.S.
On a unrelated side note, single sign on for all of our site will be happening in the coming months.
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| 2017/2018 LDraw.org Steering Committee (SteerCo): List of nominees |
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Posted by: Willy Tschager - 2017-02-01, 7:14 - Forum: LDraw.org Announcements
- No Replies
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A quick reference to the candidates for the 2017/2018 LDraw.org Steering Committee (SteerCo) election. The information is drawn from the nomination process and corrections are welcome, please email the webmasters.
Candidates are listed by nomination status in alphabetical order by last name and no ranking or endorsement should be inferred from their position on the list. The following table summarizes the status of each candidate in the format:
Nominee name: Nomination Status (Nominator, Second)
Philippe Hurbain: Accepted (Willy Tschager, Travis Cobbs)
Roland Melkert: Accepted (Willy Tschager, Travis Cobbs)
Orion Pobursky: Accepted (Willy Tschager, Travis Cobbs)
Max Martin Richter: Accepted (Willy Tschager, Travis Cobbs)
Willy Tschager: Accepted (Travis Cobbs, Philippe Hurbain)
Nils Schmidt: Declined (Willy Tschager, Travis Cobbs)
Chris Dee: Not Yet Accepted (Willy Tschager, Travis Cobbs)
Magnus Forsberg: Not Yet Accepted (Willy Tschager, Travis Cobbs)
Michael Heidemann: Not Yet Accepted (Max Martin Richter, Willy Tschager)
Trevor Sandy: Not Yet Accepted (Willy Tschager, Travis Cobbs)
Replies to this have been disabled. The nominations thread is where they belong.
w.
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| Getting rid of euler angles |
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Posted by: Santeri Piippo - 2017-01-30, 0:07 - Forum: Rendering Techniques
- Replies (4)
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Alright so I've recently taken back to work on LDForge so that we can finally have something better than MLCad and text editors to make bricks with.
And by doing so I'm back to the ages old problem of breaking the gimbal lock. I've surfed around the web for years now looking for the solution and it generally is to use quaternions instead of euler angles. But I absolutely cannot wrap my head around: how exactly does 2D screen turning translate into a 4D quaternion?
I've been bashing my head against a wall regarding this for so long that I'm not even sure at this point that quaternions are the way to go. Maybe I'm supposed to use a rotation matrix instead? Or multiple quaternions? Or a mix of both? How am I supposed to model the camera?
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| LDCad - find step number of a brick |
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Posted by: Juergen - 2017-01-27, 17:10 - Forum: LDraw Editors and Viewers
- Replies (3)
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Dear all
I'm using Rolands LDCad for building modells for a few weeks now . is there a way to determine the step number of a certain brick. The only way I know is using the step menu and go forwar or back until I know in which step a certain brick is. Is there an easier way to figure out the step number of a brick?
Otherwise it would be great to have this Information in the property window of this brick and if the brick is in the wrong step the number might be editable so I could correct this directly.
Best Regards
Juergen
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| LPub3D - POV-Ray rendering quality |
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Posted by: Kevin Williams - 2017-01-27, 17:04 - Forum: LDraw File Processing and Conversion
- Replies (4)
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Trevor,
As you are aware, I've been working on trying to improve the quality of the POV-Ray rendering in LPub3D. The first step was to implement customized lighting. That resulted in a major improvement, but I was still running into an issue that I felt needed to be fixed: many images had dark gray artifacts on curved surfaces that I couldn't get rid of simply by changing the light definitions.
I think I have finally figured out source of the problem.
When LPub3D invokes L3P, it specifies a camera angle (field of view) of 0.01 degrees (-ca0.01). I assume that you work backward from there to determine the camera distance (-cg0,0,{large number}) in order to end up with a properly-sized image. My guess is that you are using a small field of view and a long distance to minimize apparent distortion caused by different parts of the model being different distances from the camera. I think -ca0.01 is quite a bit of overkill and is leading to the artifacts I mentioned.
I have modified my program that inserts custom lighting to also modify the -ca and -cg parameters. I am currently using a 10-degree FOV and calculating the corrected camera distance. I'm quite pleased with the results. The resulting renders are much closer to the quality I get when using LDView to manually generate the POV file.
Can I suggest that you try larger FOV values to when calling L3P to improve the quality of the resulting render while still minimizing apparent distortion? Perhaps this could be a value set by the user in Preferences.
I've also been working on a way to have LPub3D use LDView for exporting POV files. I've had some moderate success, but it's pretty klugey. Since I figured out the L3P issue, there is no longer the same level of urgency to pursuing this route.
Thank you.
Kevin
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