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Messages - tazzo

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General / Rain simulation
« on: March 13, 2024, 02:37:13 AM »
Hello dear Metashape users,

I was thinking to simulate how water flow on a steep terrain.

Let's say I have the 3D model and the DEM, what's next to do a 3d simulation?

- What software are you using?
- How are you modelling soil water absorption?
- What else are you considering for such simulations?

Thanks all

Hi tazzo,

Thanks for your participation, before all.
I mean that every corner of each picture (from drone camera as example) has 3D coordinates when you project these corners on the ground (terrain). For every corner - I mean on each corner for each image: bottom left, bottom right, upper left and upper right corner.

Don't know about that, but I found similar request on this forum but unfortunatelly without right (or outdated) solutions.

Thanks! :)


Be careful because border is often discarded due to distortion compensation, would be more "accurate" to do this on rectified images instead of source images.

do you mean geographic coordinates of an orthomosaic image? should be already a geo-tiff

you don't have to do this, just assign coordinates of your markers and the position can be automatically updated

Camera Calibration / Re: A better way to calibrate cameras
« on: February 12, 2024, 03:14:43 AM »
This is done by scale bars, you have two markers with a fixed distance

General / Re: Capturing depth data using iPhone LiDAR
« on: February 10, 2024, 03:01:11 AM »
Some people were using it to scan caves where is not practical to bring mirrorless or laserscanner

Camera Calibration / Re: A better way to calibrate cameras
« on: February 06, 2024, 02:18:40 AM »
You can't have an absolute fixed calibration because every time will be slightly different. Metashape calculate from images the calibration parameters, chessboard calibration can be useful as a starting point only. Main issue is that focus change the focal lenght, then bringing lens around the world may decenter glass inside and other issues..

FBX is pretty standard because Autodesk is providing an SDK to software developers.

Meshlab support for FBX is fine in my experience, you can try Blender too.

There is a tool from Autodesk called "FBX Review" that's completely free:
You can try it too.

If your model freeze is because is too big for Meshlab, maybe you can split it in multiple models or decimate it with Metashape before export.

I don't use any Autodesk software. I have MeshLab for some processing / as viewer for FBX files.
FBX is nice because file size is usually much smaller than other formats, and supported by many softwares.
Parameters for the Sketchfab Pro plan are not related to cameras embedded into the 3d model, it's a different thing.
Why you would like to open camera positions? With sketchfab you have more freedom and you can use the view you want.

General / Re: scale bar size keeps changing from my input
« on: January 08, 2024, 10:28:59 AM »
when you use the scale bar as input, this is not the only input so will merged with other inputs (ex. points from images) and you may get an error to have the model consistent

For sketchfab i use FBX without embedded textures, just put the model and the texture files in a zip and upload it on the website. I don't think embedded cameras are supported because you need to customize these kind of things on their web interface.

Have you tried FBX and Autodesk software?

General / Re: scale bar size keeps changing from my input
« on: January 07, 2024, 08:58:41 PM »
You can set the scale bar lenght and use it to check the model or as input data depending on the checkbox.
The model may be slightly different, this is normal. Some time ago I had a 0.1mm error, I then realised Metashape was right and that my ruler was a bit off.

General / Re: replace Exif-Data by CSV-List
« on: January 05, 2024, 06:35:39 PM »
You can use exif-tool to replace images metadata

General / Re: Depth maps incomplete for some images
« on: January 05, 2024, 06:34:31 PM »
If you want a clean and dense depth map would be better to generate it from the mesh with thirty party software.

Invalid depth band are occourring when the software pick two images to do the disparity and some areas are not covered by both. Please see attached image.

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