Autodes k ReCap Ph · 2020. 10. 25. · Autodes photos. ‘image b Autodes in applic downstr...
Transcript of Autodes k ReCap Ph · 2020. 10. 25. · Autodes photos. ‘image b Autodes in applic downstr...
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Table of Contents 1. GETTING STARTED ........................................................................................................................... 3
2. BASIC WORKFLOW: From photos to a 3D model .......................................................................... 5
STEP 1 ‐ Create a new project ............................................................................................................. 5
STEP 2‐ Project settings ....................................................................................................................... 5
STEP 3 ‐ Upload photos ....................................................................................................................... 6
STEP 4 – Viewing the results online .................................................................................................... 8
3. FOLLOW UP WORKFLOW: Resubmit .......................................................................................... 12
B1. Resubmit to get different mesh quality or different export format .......................................... 12
B2. Resubmit to add more images ................................................................................................... 13
B2. Resubmit to manually stitch unstitched images ........................................................................ 13
4. ADVANCED FEATURES AND WORKFLOWS .................................................................................... 15
ADDING SURVEY POINTS ................................................................................................................... 16
INPUT KNOWN DISTANCES................................................................................................................ 18
5. WHAT NEXT? ................................................................................................................................. 21
6. 3D PRINTING .................................................................................................................................. 21
7. MANAGING MY PROJECTS and STORAGE ..................................................................................... 22
8. NOTES for existing users of ReCap Photo on A360 ....................................................................... 23
9. KNOWN ISSUES, LIMITATIONS and BUGS ..................................................................................... 24
10. ADDENDUM ‐ How to take photos that are good for photogrammetry ................................... 25
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Next you select the quality for the 3D model you wish to create
Finally, you set which export formats you wish the 3D model generated from the photos to be published in
Few details here:
QUALITY OF MESH There are 3 choices for mesh densities/qualities for the generated 3D models:
Preview – you can use this mode to get a quick result and see if your stitching (3D model creation) will be successful. In Preview mode, you can only view the 3D model, but you cannot export the mesh. (The export options are not available in this mode). This selection will give you the results in shortest amount of time, but it will also by no means give you the high quality results you are aiming. It is more a mode in which you can see if you took the photos well and if they stitch well at all, without having to wait too much.
High and Ultra – These mesh densities give you a high quality mesh model that can be exported in various formats. Given that they deliver high quality results, they will take some time to get processed, sometimes up to few hours, depending on the size of the scene.
Selecting which will depend on the time you are willing to wait for the 3D model to be calculated and the final quality of the 3D reconstruction you will need.
EXPORT FILE FORMATS ReCap Photo can export the 3D models that it generates from photos, in .OBJ, .FBX, .IPM .RCM and .RCS format. The first four are MESH file formats, while .RCS is a point cloud file format, appropriate to be opened in ReCap Pro, Autodesk’s solution for visualizing, cleaning and registering point clouds (scans). The native file format in which ReCap Photo saves the 3D scene is .RCP. This is the Reality Capture Project file and it is that file that you need to select when wanting to open/view your model online. Do not confuse it with RCS which is the point cloud format that can be opened and used in ReCap Pro. After making all the choices about the project you are about to create, click on Next to open the new page where you can upload the photos.
STEP 3 ‐ Upload photos
The service now guides you to the next step – prompting you to upload photos. You can upload photos from your Desktop (by browsing or drag&drop) or from your A360 account, if you have stored images there). To upload from the Desktop, click anywhere in the main window – this will open Finder/Explorer and you browser to the folder with your photos
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This time, you are given the option to decide whether, when you reprocess the scene, you wish to overwrite the existing scene or create a new scene. You can also review project before submitting (which will be discussed later) If you decide that the new reconstruction should be a new file and you don’t want to override the existing reconstruction you made, select ‘new version’, select the mesh quality you wish to make now and the export file formats, and click next. This will restart the computation on the cloud and you will again receive an email about the newly made reconstruction, once it is ready. Note that, Ultra setting and more export types can mean few hours or calculation, so plan on doing some other work while that is being processed.
B2. Resubmit to add more images
This is a second situation for which you might want to resubmit a project. If you notice that you have lots of gaps in your reconstruction, or see that you didn’t get the level of detail you expected in certain areas, it may be that you have not taken enough photos. If you do take additional photos (these are often detailed close ups of a part of the object where lot of detail is required, or reshooting from an angle where the reconstruction didn’t do so well) you have two strategies to follow:
you can start a whole new project and rerun Base scenario with all images
you can use the ADD IMAGES button on the left lower side of the viewer and add more images. Note: please note that the current system does care about the order of the images (their naming). So, before you upload more images, try to name them such that they will fit on the right position in the sequence of the existing photos.
B2. Resubmit to manually stitch unstitched images
When there are issues with your photos, after the scene is reconstructed for the first time, you might see that you have a few ‘unstitched’ photos, displayed in the side bar (usually you need to scroll down to see them – they will be listed under: ‘Not stitched images’). Unstitched photos are photos that the service couldn’t take into account for the model generation, because they have little similarity with the rest of the photos (for example, the contrast between two photos is too high, or the overlap is too small etc.). Adding those photos might increase the quality of the generated 3D model, but it requires a manual stitching process. You will be allowed to manually stitch those images, by defining manually matching points between an unstitched photo and stitched photo so that the system takes the unstitched photo in account. Note that you must add 4 manual points in 4 different images to have a successful manual stitch. To start a manual stitch, from the left side bar, scroll down to see unstitched images, pick one and select STITCH on the top right of the screen
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9. KNOWN ISSUES, LIMITATIONS and BUGS Limitations BROWSER: You will need to use Google Chrome as the browser. We are using a Web GL based
3D model viewer to preview 3D models in A360 and thus Internet Explorer are not supported. Try not to exceed 200 photos per reconstruction. Fisheye lenses are not supported (GoPro lenses, 8mm SLR, or any other fisheye lens). We only
currently support rectilinear lenses 5 GB storage limit of the A360 storage 3D Web Viewer As previously mentioned, note that the viewer we currently use to preview the
generated 3D scene has limitations in the size of the mesh and the quality of the texture that it can display, and thus what you will be viewing on screen is only a proxy and will not do justice to the actual quality of the mesh and texture, when processed in High or Ultra resolution. You can see the high quality results once you import the exported meshes in Memento, Maya, 3DsMax, Mudbox etc.
ReCap Photo currently has a limitation of 6 decimal digits when it comes to inputting coordinates. Inputting coordinates with more than 6 decimal places might result in incorrect distances.
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10. ADDENDUM ‐ How to take photos that are good for photogrammetry
What makes photos good for photogrammetry? The photogrammetry process looks at series of photos and reconstructs the camera location, orientation, lens type and lens distortion. It does that by comparing and matching pixels/points across photos in the Entire Scene and match/ triangulate on visual features. This means that you should follow the following guidelines: ENVIRONMENT (Lighting conditions) You should avoid any environment in which the light creates strong contrast shadows over the object you shoot. Shadows are enemy to the reconstruction process.
If you shoot in interior o The object must be placed in a room with diffuse light that does not produce contrast light
or shadow. o Do not use the flash.
If you shoot outside o Avoid shooting at midday under strong sun. Best times are early in the morning or later in
the afternoon EQUIPEMENT
You can get good results with any camera. However, plastic lenses only go so far in terms of sharpness. If you are serious about this process a good lens makes a difference.
Try to shoot the photos with a fixed lens. Fixed lens have no focal change which is good for the photogrammetry process. A 50mm lens is good.
Whenever possible, shoot with a tripod and if possible a clicker. You need this because in order to make the entire photo sharp, you will have to set a wide depth of field. This means that a very small amount of light will be coming in the camera so you will need to set your shutter speed long. This makes even a tiniest of shake of the camera result blurry photos. The tripod and a clicker will assure sharp photos.
SHOOTING STRATEGIES – SCENE SET UP
Make sure that he object you shoot is always in the middle of the photo and fills most of the frame
Use rich background. If you shoot a single object, avoid placing them on a monochromatic surface. If the surface is monochromatic, add many other smaller objects around the target object. The algorithms need as many different references in the space to do better calculation.
Avoid green photographers screens (ChromaKey). Photogrammetry doesn’t do well with them.
Don’t move objects around during the shoot and don’t have people walk around. Movements in the photos create uncertainty in the reconstruction.
Shoot all around the object to cover each aspect of it with multiple overlapping photos. Shooting each 5‐15 degrees on the same height of the object is a good practice. If you want to have a good level of detail, you should shoot at 2‐3 different heights of the object, ending up with 70‐100 photos for a small to medium object and 180‐200 photos for a building.
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Avoid blurriness in any part of the photos (ah, that beloved Depth of field effect). That will not work very well for photogrammetry. Do not assume that all is well if the object you try to shoot is sharp. We calculate the entire scene, not just the target object and any blurriness will confuse the algorithm.
Do not change the zoom if you don’t have a fixed lens. Rather move towards and away from the object.
Do not change exposure during the same acquisition.
Set ISO to 100, it works on pretty much any reconstruction. Or simply keep the ISO low. High iso brings noise which should be avoided.
The ReCap Photo service currently accepts JPEG format only. However, if you shoot in RAW, you will have the ability to do some changes in the RAW images that WILL affect the quality of the 3D model. You can always re‐export JPEG’s from the Raw images using photo editing sowftare such as Adobe Photoshop or Bridge.
KNOWN TECHNOLOGICAL LIMITATIONS OF PHOTOGRAMMETRY The photogrammetry process does not work on shiny, transparent or highly glossy objects. This is due to the fact that these reflect the surrounding which makes the same point on one photo to be in a different color on another photo, making it impossible for the algorithms to calculate the scene. Enjoy using ReCap Photo and please send any questions, suggestions and wishes on the ReCap Photo forum http://feedback.autodesk.com/cloudservices/products/cloudservices_recap Want to know more about Project Memento, Autodesk’s fun, fast, powerful solution for fixing huge meshes ? Go here: http://labs.autodesk.com/utilities/memento
For any questions or suggestions for improvement of the tutorial, please contact
[email protected] or [email protected]