Theme 7: Photogrammetry

Submit Assignment
  • Due Feb 28 by 11:59pm
    •  
  • Points 30
    •  
  • Submitting a website url or a file upload

Task

Photogrammetry is a HUUUGE subject! We'll do our best to generate a textured 3D model, but all I REALLY need you to turn in is a screenshot of a point cloud.

Purpose

Photogrammetry is measuring from photographs, and in modern context it involves turning photos into a 3D model. Photogrammetry is a major aspect of modern film and game pipelines. Museums are using photogrammetry to preserve human culture, and insurance companies are using photogrammetry to assess whether your roof is dangerous.  You can even get 3D scanned for your wedding! 

Criteria for Success

Although a robust 3D pipeline isn't going to be achieved in 2 weeks in a non-3D class, the process for photogrammetry is only a few steps: 
  1. Set up your scene for scanning
  2. Take photos correctly
  3. Process all your photos
  4. Turn your photos into a point cloud
  5. Turn your point cloud into a denser point cloud
  6. Turn the dense point cloud into a mesh
  7. Generate a texture for your mesh
  8. Use that big fancy mesh in all sorts of cool ways! 

Rubric

30 points for a screenshot of a dense point cloud. +20 points of extra credit if you upload a .obj with a successfully stitched texture! 

Knowledge & Skillz




The most robust tools for photogrammetry are Agisoft Photoscan and RealityCapture. Since we don't have those licenses, use the following two pieces of software:
To further process the point cloud in MeshLab (Links to an external site.), please see the documentation of MeshLab. Here is a possible approach:
  • Start MeshLab and open the exported MeshLab scene (called "sceneMeshlab.mlp").
  • If necessary, edit the point cloud with the tools of MeshLab
  • Create a surface: Choose the menu Filters -> "Remeshing, Simplification and Reconstruction" -> "Surface Reconstruction: Poisson". Enter the desired parameters, for example 9, 6, 1, 1
  • Remove the undesired parts of the surface with MeshLab's tools
  • Select the Poisson mesh in the layer dialog
  • Create a texture by choosing the menu Filters -> Texture -> "Parameterization + Texturing from registered rasters", edit the required parameters
  • Save the resulted mesh

Examples

Shooting examples: Try using the demo files from Agisoft! http://www.agisoft.com/downloads/sample-data/ (Links to an external site.)
Assignment examples: If you got this far, I'm proud of you!  

Comments

Post a Comment

Popular posts from this blog

Theme 6: Panorama Submit Assignment Due   Feb 14  by  10:45am   Points   30   Submitting   a website url or a file upload Task Each week, post 6 photos that fit the weekly theme: 3 unedited, and a version of those 3 with edits made in Lightroom or Photoshop.  This week: PANORAMA !   Purpose Panoramas are one of the most jaw-dropping ways to shoot the world around you, but they impose specific technical challenge. Lens choice, stitching software, and learning from your mistakes all play in together for a great panorama.   Criteria for Success Successfully upload TWO panoramas. Since they're made out of a ton of photos, I don't think 3 is needed :P Use jpegs unless otherwise stated in that week’s theme. You can upload your files in a .zip or .7z. Additionally, if you have a Flickr account, website, or other online portal you’d prefer to use, post your photos there and turn in a URL as your assignment. Rubric 30 points total. 5 points for 3
Read more
Image
Week 9: Food Submit Assignment Due   Mar 13  by  11:59pm   Points   30   Submitting   a text entry box or a file upload Task Each week, post 6 photos that fit the weekly theme: 3 unedited, and a version of those 3 with edits made in Lightroom or Photoshop.  This week:  FOOD!   Purpose  (Links to an external site.) Look at these delicious meals. LOOK AT IT!   All of these are for fast food and microwave TV dinners, usually extruded out of plastic bags that were shipped out of Cincinnati like five years ago. It's the lowest quality, least fresh food you can eat! And through the powerful lie within a great photograph, it all looks like a beautiful dream that tastes great and came straight from the farm.  Criteria for Success Successfully upload 3 unedited images and 3 Lightroom-edited images. The food should be beautiful. As a MANDATORY part of the shot, include 1 "fresh" ingredient off to the side. I don't care if you opened a 99 cen
Read more

Week 7

Theme 7: Photogrammetry Submit Assignment Due   Feb 28  by  11:59pm   Points   30   Submitting   a website url or a file upload Task Photogrammetry is a HUUUGE subject! We'll do our best to generate a textured 3D model, but all I REALLY need you to turn in is a screenshot of a point cloud. Purpose Photogrammetry is measuring from photographs, and in modern context it involves turning photos into a 3D model. Photogrammetry is a major aspect of modern film and game pipelines. Museums are using photogrammetry to preserve human culture, and insurance companies are using photogrammetry to assess whether your roof is dangerous.  You can even get 3D scanned for your wedding!  Criteria for Success Although a robust 3D pipeline isn't going to be achieved in 2 weeks in a non-3D class, the process for photogrammetry is only a few steps:  Set up your scene for scanning Take photos correctly Process all your photos Turn your photos into a point cloud Tur
Read more