A large project of my neighborhood

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    Steven Smith

    Update,

    I've added a lot more pictures and have run up against the 2500 picture limit. I might do 2 models, one being in the demo as pictures are unlimited and i can still export renders and video, and one limited as a model to sketchfab or something. 

    I'm also having trouble aligning pictures from the ground with the drone shots. The difference in the angle is 90 degrees and the lack of overlap is giving me some trouble. Ideas are welcome for this problem. So far i've been thinking about just doing 2 different components and merging at the end.

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    Steven Smith

    While building the 1st drone component, I got Median error 0.00000

    Interesting. I doubt that is correct though.

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    Steven Smith

    Does any one have a sugestion on how to fake ground control points? My idea is to get coordinates from google maps on the stop signs and add them to RC. But what about elevation data? 

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    Steven Smith

    Got the ground component aligned now to just join them together.

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    Jonathan_Tanant

    Great work Steven !

    Drone Harmony is really a good tool - I found out that the "Stop and shoot" mode where the drone really stops at each shooting point very convenient and really improves the picture sharpness !

    When mixing ground shots and aerial shots, you should include oblique shots at several heights (and several gimbal angles - you could do 90°/60°/30°/0° at h=10m 30m 50m for example), this will help alignment between all the shots (ground an aerial). Otherwise, Control Points are your friends ! :-)

    Any issues with the warm hot spot on your Mavic pro ? (I have on mine, the center of all pictures has a warmer hot spot, this is well known and discussed on forums and is related to the lens and sensor design...)

     

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    Jonathan_Tanant

    And, about the ground control points, I use a small bubble level on the top of my photogrammetric scale (which includes 4 points at known coordinates). The fact that my scale is horizontally leveled let me put the coordinates xyz directly, z being = 0 all the time.

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    Reece Fraser

    Hi Johnathan - what do you mean by adding a bubble level to your photogrammetric scale with the 4 points at known coordinates? I’ve been experimenting with a duo of bubble levels which precisely measure angle and I need to vectorise to work out absolute level. Is this what you mean?

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    Jonathan_Tanant

    Here is the photogrammetric scale I am using.

    • The print is a design by Samantha Porter. 4 points A, B, C, D with known coordinates on the plane and known distance between facing points (12 cm). 
    • Plastified, Laminated on a plywood so it is perfectly flat and sand to remove specular highlights.
    • 4 plastic/metal feet with adjustable height.
    • 1 round bubble level.
    • 1 compass (so I can make sure my orientation is known relative to magnetic north, this is optional).

    How I am using it :

    • put on the ground and level using the bubble level and adjustable feet to make sure this is perfectly horizontal. The bubble needs to be perfectly centered in the window circle.
    • shoot at least 6 pictures with several angles.
    • put 3 control points in RC with the coordinates : because we made sure the scale is horizontal, we know that Z coordinates will be = 0 the other will be x=-0.06 or x=0.06 and y=-0.06 or y = 0.06.
    • align

     

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    Steven Smith

    Jonathan,

    Yeah I use the stop/precise images on Drone Harmony. Did you notice they just started charging. Good for them though. They are the best and deserve it.

    I really like that scale but I was wondering about elevation and getting gps coordinates. Google maps seems to round the lat and long to about 30ft. I know the areal view is way more accurate than that just by watching my position change while walking around with my phone. I'm sure I can get coordinates. I just don't know a good way to get elevation with out spending over $100.

    I did do a pass with the gimbal at 45° to help but didn't want to go any further (didn't want to point a drone camera into my neighbors garages and windows)

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    Steven Smith

    I think I get what you mean by elevation. If the control points are level then any change in elevation will be recorded :) do you think that would work at this scale?

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    Jonathan_Tanant

    yes, it would work.

    About the proper georeferencing, I am not that experienced with that. I think that you need 3 points and a precise GPS device, it must be covered in the doc.

     

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    Steven Smith

    Yeah, I've asked about it on the form a few times now. I don't need millimeter accuracy. I think a meter or so would make me happy. I'm just not that experienced in surveying.  Setting a way-point on the drone and having it fly to the same coordinates multiple times seems like it accurate enough for my needs. I'll try using a level next time. I just worry that at a mile out the accuracy could be out more than a meter.

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    Steven Smith

     

    Project Update:

    I have been trying for 3 days to reconstruct on high quality, but either the computer reboot in the middle of the night or while I'm watching starts using crazy amounts of RAM on the last few parts consisting of 20-50 vertices. Looks like some kind of memory leak?

    I took a little break today and did a little side project before work to distract myself.

     https://photos.app.goo.gl/daAndkw9sHMvyxKJ8

    My favorite one is where she is sticking out her tongue (proboscis?) 

    I hope ya'll enjoyed the distraction as well ;)

     

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    Steven Smith

    Ok

    Part 1 of 3

    https://www.youtube.com/watch?v=JhVFMyjU7To

    Part 2 I'm just using the above video

    https://www.youtube.com/watch?v=RGlh4Db6__I&feature=youtu.be

    Working on part 3 now

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    Steven Smith

    OK, Part 3 Results

    https://www.youtube.com/watch?v=noIdoI789oI

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    Steven Smith

    Hey Jonathan, 

    Any suggestions on how to get this into vr? Obviously close to a billion triangles wont work. I'm afraid if i go decimating I'll ruin the detail of it.

    The most experience i have with this is bringing a model straight out of RC into Steam VR Home.

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    Steven Smith

    I'm going to try these again

    https://developer.valvesoftware.com/wiki/SteamVR/Environments/Advanced_Indoors_Photogrammetry

    https://developer.valvesoftware.com/wiki/SteamVR/Environments/Photogrammetry

    See how well I can absorb the material. 

    One question for anyone with experience. What is the easiest way to say make a deformed wall/hole in it, flat? With out spending $1000 on software. Preferably free, definitely under $100.

    Bonus points if in VR!!

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    Jonathan_Tanant

    If you think "high end VR" (HTC Vive or Oculus Rift), my rule of thumb budget is 1 Million to 5 Millions triangles, usually 2M-3M for a typical environment, depending on various factors.

    And when it comes to texturing, I am usually trying to reach 2mm to 4mm / texel for high quality environments and 0.5 mm to 1mm / texel for objects details / closeups.

    So, I would start simplifying to, let's say, 2 Millions, texture it at 2mm/texel on 8k textures and see what you got here.

    If the quality is not that good, you will need to simplify in a smarter way, using ZBrush, or MeshLab and playing with the smoothing and decimating filters to better organise your triangles. 

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    Jonathan_Tanant

    And if you think more "mobile VR" (Daydream, Oculus Go, Gear VR...), then you are more in budgets around 50k to 200k... again depending on various factors... 

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