Multi-camera setup project. - page 18 - Creative Uses of CHDK - CHDK Forum
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Multi-camera setup project.

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Offline waterwingz

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Re: Multi-camera setup project.
« Reply #170 on: 04 / September / 2014, 09:23:05 »
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Quote from: mphx on 04 / September / 2014, 03:21:29
In my region (Greece) , grounding is not something that is setup properly.My friend asked the electricity technician that he setup the electric stuff on the studio and he told him that even in more complex buildings , ground wire in the sockets is not even connected somewhere..just hanging in there...go figure...pathetic country with pathetic people when it comes to do a job right.
The discussion here about the grounding system in your building, and the importance of protection circuits on the AC high voltage side, is a valuable discussion about electrical safety.

However, it has almost nothing to do with your problems.   

What you are dealing with is a whole lot of floating DC low voltage systems (cameras & hubs) without a common voltage reference point (sometimes mistakenly called ground).  This gives you all kinds of current paths and voltage drops - made  worse by high frequency noise and coupling between cables.    Ideally your common voltage reference point ( the thick wire I talked about earlier ) would also be connected to an earth ground provide by your building but just having a common reference is 95% of the battle.
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Offline mphx

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Re: Multi-camera setup project.
« Reply #171 on: 04 / September / 2014, 12:58:53 »
Quote from: waterwingz on 04 / September / 2014, 09:23:05

The discussion here about the grounding system in your building, and the importance of protection circuits on the AC high voltage side, is a valuable discussion about electrical safety.

However, it has almost nothing to do with your problems.   

What you are dealing with is a whole lot of floating DC low voltage systems (cameras & hubs) without a common voltage reference point (sometimes mistakenly called ground).  This gives you all kinds of current paths and voltage drops - made  worse by high frequency noise and coupling between cables.    Ideally your common voltage reference point ( the thick wire I talked about earlier ) would also be connected to an earth ground provide by your building but just having a common reference is 95% of the battle.

I get what you are saying.

We did some more tests today.We had around 4 tripods working 100% stable for hours..we just took apart usb cables and power cords of dummy batteries.
Also we replaced some usb cables with shorter ones.We gonna replace almost all of them with short ones.
We now wait for some hubs to be delivered in the next few days and replace the ones we have now so we will be kinda sure that we use the best hubs we can get.
We gonna order tonight the shorter cables and we gonna put hubs in the center of the tripods and all usb cables gonna be far away from power cords that are gathered in the bottom of the tripods.

Target is to have atleast 4 tripods stable per pc .If we succeed atleast that then we gonna work with 2 pcs.If we have more stable tripods then we might risk it to use only one pc.

We will first try this scheme , i mean taking apart cables since it seems that it does some good in the whole situation , and then we will think about more grounding actions.
« Last Edit: 04 / September / 2014, 13:01:46 by mphx »
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Offline waterwingz

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Re: Multi-camera setup project.
« Reply #172 on: 04 / September / 2014, 13:00:57 »
Are you using the hubs with power supplies or using them unpowered?
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Offline mphx

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Re: Multi-camera setup project.
« Reply #173 on: 04 / September / 2014, 13:02:19 »
Quote from: waterwingz on 04 / September / 2014, 13:00:57
Are you using the hubs with power supplies or using them unpowered?

All usb  hubs are powered.
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Offline novsela

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Re: Multi-camera setup project.
« Reply #174 on: 06 / September / 2014, 12:59:53 »
@mphx -  the pic is for you to see how we run the cable across the rig
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Offline mphx

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Re: Multi-camera setup project.
« Reply #175 on: 09 / September / 2014, 14:46:55 »
UPDATE

Nothing new to be honest :) We are waiting some hubs tomorrow and we bought one more tripod so we are going to play with 9 tripods ( 7 cameras each) ...two tripods close to each other for the "face" and the rest of them in circle.

Here is a rough example of a test we did http://p3d.in/GA01v (this is my friend :P )
As i said , when cameras are working, result is more than sufficient.Lets hope with the new hubs and the shorter cables we are waiting by the end of the week , problems will be eliminated , if not entirely ...atleast ...A LOT.
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Offline Kam_mim

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Re: Multi-camera setup project.
« Reply #176 on: 09 / September / 2014, 15:14:29 »
Very Good result mphx.. What software are you using for this?
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Offline Microfunguy

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Re: Multi-camera setup project.
« Reply #177 on: 09 / September / 2014, 15:14:51 »
Quote from: mphx on 09 / September / 2014, 14:46:55
.

Here is a rough example of a test we did http://p3d.in/GA01v


Cannot display, Windows XP not supported and my Windows 7 PC does not have a separate graphics card.

Apart from that, let me ask you a basic question  ...............

you create a 3D model of a person, what then, what is it for ?
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Offline waterwingz

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Re: Multi-camera setup project.
« Reply #178 on: 09 / September / 2014, 15:58:32 »
Quote from: mphx on 09 / September / 2014, 14:46:55
Here is a rough example of a test we did http://p3d.in/GA01v
Very nice.  Displays perfectly on my low end Win7 laptop.
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Offline mphx

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Re: Multi-camera setup project.
« Reply #179 on: 09 / September / 2014, 16:30:54 »
Quote from: Kam_mim on 09 / September / 2014, 15:14:29
Very Good result mphx.. What software are you using for this?

i am not the 3d expert here but i will try to recall some of the programs used.

Model is created from the photos using agisoft photoscan. Pretty awesome program...
For high quality modelling in a serious pc it needs around 2 hours .For a medium result some minutes.
After model is created there are many rough edges on it.If we had dslr cameras these rough edges would have been as less as possible.
So 3d expert is doing some sculpting .Smooth the model.I can't recall the name of the program..but this program does only sculpting.Nothing else.
Then we take 3d model into 3ds max and we do some correction.
We re-attach texture in the new smooth model (as i am told that's a bit of work to get it right) and we correct anything didn't come up right..interior of arms , legs etc etc.

If you want specific names of programs , i can look them up tomorrow that i will be in the studio and check them at the pc.

Quote from: Microfunguy on 09 / September / 2014, 15:14:51

Apart from that, let me ask you a basic question  ...............

you create a 3D model of a person, what then, what is it for ?

The whole purpose of the project is to create 3d miniatures of people.Of any kind and posture.A family , a single guy/girl , a bunch of friends , babies , dogs and combinations of all the above.
Maybe someone wants a miniature to remember a day/occasion (e.g. wedding , a newborn baby etc etc).
Maybe someone wants to give a special gift to someone...or something...

Apart of just modelling the person we can do any custom job he wants..his head to someone's else body (e.g. spiderman , superman :) , holding something weird in his hands..whatever...)
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