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Messages - Steve003

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16
General / Variable density of polygons to suit surface complexity..how ?
« on: August 12, 2022, 10:10:50 PM »
Hi,
It strikes me that its wrong to choose ultra high to get the detail of items that sit on an otherwise smooth or slightly undulating surfaces. Take a vintage tractor, many smooth areas such as bonnet, sides, wheel hubs and rims, tyre sides (except for the lettering) cab structure, etc, with fasteners, wiring, and more detailed components showing lower on the sides, tread, axle joints etc.

How can one choose a setting to see a low poly count get used on smooth and a high poly count on detail.

I choose ultra high and get far more than I need, decimate attacks ALL polys and I lose the detail.

This is a fundamental need of the entire process and world of meshes AND EXTREMELY IMPORTANT.

How is this achieved, as I take the mesh into Rhino3D and its like wading through molasses, hellishly slow, when most of it doesnt need that density at all.

At times unworkable due to the speed hit, all for the detail parts I need on that tractor for example and I am looking at areas with far to many polys for what they need.

I dont see vids on this, everyone is doing rocks and aerial photos and fossils it seems.

Steve003

17
General / Re: when using mesh from depth maps deleted areas reappear
« on: August 12, 2022, 09:31:12 PM »
Hi,
Quote
Arie...It seems you might want to optimize your data acquisition methods. I've been using Metashape for a long time and can't even remember the last time I had alignment issues.

All my photos are correctly exposed evenly lit, 12 out of 22 failed the other day, ran them in photoscan and they all were aligned.
I had 1 fail in each of 2 sets, subject very matt, rusty covered in the most ideal surface pattern sat on newspaper, looking at the failure it had good progression from the previous one and into the next one that got aligned.

the photos couldnt be better, bounce flash off the ceiling in all cases or direct flash, only suitable of item has very matt surface, all are adjusted in camera raw in photoshop, detailed revealed in shadows, lighting variances evened out, honesyly those that fail have no apparent reason to at all.

Now if I feel the background might be causing issues then I want to mask it out of the process, and thats why I want to know the easy way of doing so on 144 photos for example.

But if one has to make the model before using mask from model, thats a catch 22, how does one overide that one ?

I am still baffled by that.

if only someone would even reply to my asking how to use Photoshop to make a mask.
https://www.agisoft.com/forum/index.php?topic=14717.0

I will be sending Agisoft the photo sets of those that fail align in metashape and get aligned by photoscan.

usually metashape lets me down on alignment and photoscan never ever does.

polarnick, unfortunately I dont use metashape pro.  I do wonder if pro also fails in same way as Standard.

Steve

18
General / Re: Where are the video tutorials on metashape ?
« on: August 12, 2022, 09:19:38 PM »
Hi,
No I wasnt, thats great news , if they cover the things I am forever needing to know about.
I will study them and see.

Many Thanks

Steve003

19
Thanks, I will follow those through.

Steve003

20
General / Re: Ortho where is 2D grid and a 2D rotate tool ?
« on: August 12, 2022, 04:37:45 PM »
Please anyone, I am forever spoiling my aligned model or region as there is no way it seems to reset the rotation sphere to have its coloured red blue green lines to suit ortho, i.e round the edge of the sphere and exact down middle, where I wish to rotate in 2D mode, as ortho is 2D.

and we need a grid in front side as well as top views, how ?

Steve003

21
General / Re: when using mesh from depth maps deleted areas reappear
« on: August 12, 2022, 04:25:07 PM »
Hi,
No alignment errors in the project I am running (though in 2 of the sets of photos one wouldnt align, no apparent reason,  solved by using photoscan. as always.)

but in an 'its possible' scenario, for us all,  still hoping someone somewhere can explain the role 'masks' play or could play if a background was causing problems, lets say a human was in a few shots moving about., when photographing a tractor at a show for example. the workflow steps to solve such.

good for us all to know.

Steve003

22
General / Re: when using mesh from depth maps deleted areas reappear
« on: August 12, 2022, 03:33:15 PM »
Hi, I will try both suggestions.
As the region is a box and as this is an arched item standing on the newspaper, its a sort of W shape, the region cannot be made to exclude the newspaper under the arched item.

If the background is such that its confusing the build, and as 'mask from model' apply to all cameras,  clearly requires the build to succeed to be used, it strikes me that mask from model has a use after the model is made, and cannot help make the model in the first place.

Could someone explain the steps involved from importing photos,  and how useful mask from model is and its use and purpose and how it avoids an apparent catch22 situation ?

Steve

23
General / unable to see the thread I just replied to
« on: August 12, 2022, 03:22:44 PM »
https://www.agisoft.com/forum/index.php?topic=8012.0

I replied to this yet its not visible under general>masking which is the address is shows whilst doing so.

I expect to see a post called masking in the general section but nothing shows.

so as such no one especially Alexey will see it.

having thousands of views it was proving useful especially awaiting the answers.

Steve003

24
Hi,
Such wouldnt work.
The item was sat on a picnic table covered in flat newspaper which was taped down , each time the item was moved to photograph its underside or topside etc (called a set for each photo set) the newspaper was then different to the item.
I happened to make a mistake and fed two sets to metashape at the same time, and when align photos was done I had a double image going on.
So I had in fact done what you suggest by accident.

If I were to spend many hours masking out the background and newspaper from a few hundred photos then yes that would work. I dont have time to do such, as this is one of many projects, and I am years behind as it is. That metashape is often failing to align a GOOD set of images and photoscan manages it perfectly everytime is also a real pain as it messes me about. Wish Agisoft would solve that failure with metashape, they are aware and have photosets that prove it.

As such the newspaper helps as it provides a nice detailed part of the subject to ensure good alignment, bit like targets but far better.

That it keeps reappearing despite trimming it off in initial cloud after align, as I am using mesh from depth maps, IS DOING MY HEAD IN.

another issue Agisoft should really fix as its a fundamental flaw.

Anyhow it sounds as if I should trim away the model (I have each set as textured now) leaving only quality areas to merge.

Should I take the shaded stage and trim and merge or take the final textures stage and trim and merge ?

I wondered if 'merge chunks' was 'intelligent ' enough to merge the best parts and discard the not so good parts, lessening our workload.

Steve003

25
Hi,
we all know those areas that look like the base board has a snow drift up to the model, covered in texture thats gone blurred.

I have a metal object photographed on a table. laid on its side then standing upright, so  have two chunks 1. top and sides, 2. underside and sides,

can I just go ahead and merge chunks, after first bringing them into the relationship they are, which in effect will see them intertwined with each other, and expect merge chunks to remove the not so good bits, or do I have to trim off the parts the other chunk will provide and repeat such trimming on the second chunk ?

What is the correct way ?

Steve003

26
General / when using mesh from depth maps deleted areas reappear
« on: August 11, 2022, 10:26:24 PM »
Hi,
Metashape 1.8.2
I like to tidy up the model, when after align photos I delete the base its sitting on for example, currently a newspaper is my victim !
I am using mesh from Depth maps to see if its better, HOWEVER the base (newspaper) keeps reappearing.

It is NOT POSSIBLE to delete an unwanted base a model sits on, when using workflow ' mesh from depth maps' is my conclusion.

Am I right ?

surely we dont want that tedious time spent erasing up to the model to be wasted,  what is the solution to this ?

Steve003

27
General / Re: Numpad navigation removed from 1.8.2 why ?
« on: August 11, 2022, 12:29:08 AM »
Hi, Now you might be onto something there, I have never considered the numlock button , never in life ever used it, maybe I hit it off by accident.
I have remapped the numpad keys to 5 toggle ortho/persp, 4 left side, 6 right side,  2 front 8 back 9 top and 3 bottom,
I would need to run agisoft as it comes out of the box to see if numlock makes a difference.
on that note, i launch photoscan which I havent altered the key allocations and yes numlock sees 5 work as toggle, as well as 4 2 8 6, cant fathom out what top view is as the key allocs in preferences are not there. where are they ?

I hit 9 and got a view suiting 3d glasses..   :) must explore further !

Steve003

28
General / merge chunks does it work without dense point clouds ?
« on: August 10, 2022, 12:37:03 AM »
Hi,
http://www.re3dan.com/combiningchunks
says merge chunks uses dense point clouds, however making mesh from depth maps gives finer detail so an article proves, and agisoft has that ability after align photos one can choose build mesh source depth maps. skipping dense PointCloud making.

However if the project involves merge chunks, such merge CANNOT THEN WORK as the article above shows merge needs dense point clouds instead !

... then I find an Agisoft article which sheds some light on it.

https://agisoft.freshdesk.com/support/solutions/articles/31000157701-manual-chunk-alignment-standard-edition-
which shows a choice of choosing dense point OR model OR depth maps.
so one needs such for BOTH chunks, either make a model from the dense point cloud and combine it with the model from the mesh from Dense Point cloud, or go and make a dense point cloud after having made the mesh ! more time and can one do that ?

so if merge chunk using mesh option, mesh from depth map will need a mesh making from the dense point cloud before merge chunk can be made.

or there is the depth map option which exists after align and before mesh is made, would that be as good ?

With that option though, how can one align the chunks when there is nothing model wise to rotate and place with the other chunk ?

surely a mesh or DPC is needed to view both and place together, such as in the tutorial I found on thee statue and stately home.

Steve003

29
General / Where are the video tutorials on metashape ?
« on: August 09, 2022, 10:56:15 PM »
Hi,
Where are the video tutorials on metashape ?
Does Agisoft not have any video tutorials its made about its program, Its no use relying on youtube as the tutorials are not structured to show the different options available.
They are whatever the user fancied and often their narrative is poor, or no voice at all. Either rocks or fossils, green screen background ot uniform colour. My backgrounds are real world, whatever happens to be surrounding an object in a museum or out of doors at an event if its a vintage vehicle. No one ever seems to do such, aerial views is common.

I have just photod a metal rusty object on a table in my lounge, 400 photos or more as it was in two broken pieces. So how to deal with photos that dont align. You tube videos always have everything aligning. Most times Metashape fails, and Photoscan always aligns ALL.

Use of mesh from two options and how to do so.

Basically a walk through including masking, but not of 400 photos ! How to deal with 'reality life' situations, cluttered backgrounds. best settings etc.
I find metashape will create a model with the background, which can then be erased out, its the few photos that wont align, despite reset align and try again., and that Photoscan WILL ALIGN them. Something fundamentally wrong with Metashape.

Every prog needs a tutorial, but where are they ?

Steve

30
General / Ortho where is 2D grid and a 2D rotate tool ?
« on: August 09, 2022, 05:57:35 PM »
Hi,
Q1. why is there no grid to align to when in ortho view side views ? we have grid in top/bottom but its vital it exists in all ortho views such as side.
Its the whole purpose of ortho, yet we have nothing to align to.

Q2. Tumbling is for perspective view, precise rotation is for ortho, how do we stop 3D rotation when in 2D ortho view ?

In other words where is the ability to rotate with mouse BUT NOT TUMBLE the item in 2D view when doing so ?

Using ortho is best way to align model and region , 3D tumbling and movement is not wanted , it spoils the alignment.
One is forever undoing the messed up alignment.

Q3. Also how do we get the rotate sphere to reset to the view that gives us a coloured ring on the outer edge of it when in ortho view ?
So as to be able to pull on the red outer ring when in ortho and avoid tumbling. ?

Cheers
Steve

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