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cdschroer last won the day on November 6 2018

cdschroer had the most liked content!

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About cdschroer

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    San Francisco, CA
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    All aspects of computational photography. Adoption of new tools and technologies and training programs. Software development of tools for RTI, Algorithmic Rendering, and related technologies.

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  1. cdschroer

    Problems with Flat Runs on Pottery

    Jack - It would help to see some screen shots of what is happening. Things with narrow edges are difficult to get alignment of the 2 sides. I can't tell from your post, whether you are shooting circuits with the pieces upright, or shooting each side and turning over. That would affect the approach to solving this. Also since you say that images of the "bottom" don't align - I'm wondering if they would align to themselves in a separate chunk - then you might be able to bring the chunks together. That is not the optimum way to do it, but it could be a interesting test. I think you know that the biggest issue with relatively flat subjects, is having enough data across the thin edges to get the sides to be in the right relationship to each other. Also, if you shoot each side, you can put each side on a different background, so that the software doesn't match the backgrounds - this can create errors in alignment. That kind of problem could be solved by masking - but it's easier to just use different backgrounds. Carla
  2. cdschroer

    unknown error detected in RTIbuilder

    Glad you were able to sort it out yourself. Well done! Carla
  3. You do not say what platform you are on. If you are on the Mac - then you must make sure that you installed the software by dragging it from the .dmg (disk image) onto the applications folder. If you try to run the software from the disk image (dmg) then these kinds of problems can occur. If this does not solve the problem, please give more details about the environment where you are running the software. Carla
  4. cdschroer

    light beam angle

    Hello! You want even illumination across the surface of your subject - and from an appropriate standoff distance (2 times the diameter of the area you are imaging is the minimum) We use a wide beam spread for things like a speedlite. So ours are set to 24mm for the old Canon 580ExII model. Some of the newer models have an even wider spread. You want to make sure you are pointing the light at the center of the subject, and keep pointing it there for each light angle. In other words, you don't want some light pointing at the center, and others at the edges. All lights should point to the center. If you don't have enough light standoff (the distance to the front of the light from the center of the subject) you will not get good quality normals as you move away from the center of your subject. This is usually visible in the normals visualization, and can often be seen in the specular enhancement mode, especially with no color. Carla
  5. cdschroer

    Umlauts in folder names on Mac

    Thanks for reporting this! I wasn't aware of it, and don't think it has been reported before. We don't have any plans for updates to the viewer in the short term, but we will put this on the list for the next time we do updates. Carla
  6. cdschroer

    An alternative for controlling 3W leds

    I'm with leszekp on this. The software expects that nothing changes except the light positions. The images from the lower angles should be darker. Don't compensate with the lights, and don't exposure comp those images. You might want to read through the guide to highlight image capture on the CHI website - even though you are building a dome - because some core principles like this are described there. Carla
  7. cdschroer

    The size of dome

    Well, you can get decent visualizations if you violate this rule, but you won't have good normals, as you move farther away from the center of the subject. If you use normals visualization or specular enhancement with no color (both rely heavily on the normals data) you will see problems around the edges. So, it's all about "fit for purpose". If you want good normals for the whole subject, then you need the standoff. If you just want some relighting to get a decent screen shot, you might get away with less.
  8. cdschroer

    The size of dome

    Dear weiwei - do not worry. You set up a new topic, which was appropriate, and there is some information here that hopefully is useful. Also others should be able to find this, and I deleted the duplicate. Sometimes it is helpful for me to remind people, since this does happen from time to time. Welcome to the forums! Carla
  9. cdschroer

    The size of dome

    The recommended standoff of the lights for RTI is 2 -4 times the diagonal size of the subject. This is described in the Guide to Highlight Image Capture on page 23 (see below) If you use less than 2 times the size of the subject, you will not get accurate surface normals for the area outside the center of the subject that doesn't meet the light standoff requirement. I'm asking one of the computer graphics folks to reply as to the technical reasons for this. I know from experience and testing that this is true. Carla PS: I removed this identical question which you added to the end of another unrelated topic in the photogrammetry forum. This is appropriately a separate topic, and the discussion should take place here. As a reminder to folks - it is not helpful to post the same question in more than one place on the forums. Please find the most appropriate forum, and either add to an existing topic (if your question is part of that topic) or start a new topic. Thanks!
  10. cdschroer

    Error Dump

    Katie - It looks like you gave RTIBuilder the path to the ptmviewer instead of the ptmfitter. You need to change it to the ptmfitter - which you also download form HPLabs. It may have been in the same package you already downloaded. In that case, just open your existing RTIBuilder file for your project (instructions towards the end of the User Guide - for "open existing project) and when you get the final screen where you can "execute" building your RTI or PTM, change the path to the ptmfitter there.'' Carla
  11. cdschroer

    Masking trouble in Agisoft Photoscan

    Thanks Dave - yes - we try to keep to more general photogrammetry issues here in this space because Agisoft runs forums for PhotoScan. We are happy to entertain general questions about setup, good practice, equipment, photogrammetric approaches, etc. That said - there are some odd behaviors within photoscan related to masks whether you are doing an individual image, or a whole set. Crystal is correct that you need to select the folder containing the images, and the background image. If that folder is already selected then I usually select another folder, then the one I want to use before saying OK. Go to the Agisoft forums if you continue to have difficulties - and make sure you include what version of photoscan you are using, and what platform you are on (Mac, windows, linux - and OS level) Carla
  12. cdschroer

    Why my rti file is invaild and internal format unknown

    Hernandez - I'm not clear what problem you are having. First you need to have a .ptm or a .rti file. If instead you have a file of some other type (like Fmck showed) then this isn't a valid rti file. My guess is this is the result of something like the WedRTIViewer which does pre-processing on an rti or ptm file to set it up to work with a web based viewer. If that is the case - then the resulting folder has to be set up on a webserver with the appropraite HTML code to call it. This is described on the web page for the WebRTIViewer. I'm not an expert on that. If you want to use the regular RTiViewer - then you need an rti or ptm file. Carla
  13. cdschroer

    Missing file: PTMFitter.exe

    Loa - We wish we could include the PTMfitter software, but this license issue (from HP) prevents it. The easiest way to check for spaces in your pathname is to go to the "assembly-files" folder created by RTIBuilder and open one of the .lp files (it is just a text file - you can open it in any text editor) There you will see the full path to the image files. You will be able to see if you have any spaces. If you do - move the whole folder (with the .xml log file, and the jpeg-exports folder, etc) to a correct location - or rename the needed directories. Then you should be able to build an RTI from the existing project without having to detect the spheres and highlights again. How to do that is described towards the end of the user guide - and also elsewhere in the forums. If the filenames themselves have spaces, then you will have to start over after renaming them. Good luck!
  14. Khalid - I can get both files from these links. The RTI spec was uploaded to this forum - so you have to be logged in to the forum to get it. I should have specified that in my earlier post. What happens if you click on the link? (For me, it downloads the file to my downloads folder) Carla
  15. cdschroer

    Missing file: PTMFitter.exe

    Dear Loa - Sorry you have had such difficulty getting the software installed. It is very well documented in the User Guide that the PTMFitter is not included with the software and must be downloaded and installed from HP's website. This is because the RTIBuilder and HSHFitter software are both available under an open source license (GNU GPLv3) and the ptmfitter has a free for non-commerical use license with no source code. That license from HP does not allow us to bundle the software together, though it does allow you to download it for free and tell RTIBuilder where you installed it. You should be able to run the hshfitter without installing the ptmfitter. The "unknown error" message is likely not an installation problem. It is described in multiple places on these forums. The highest likelihood is that you have spaces somewhere in your image filenames and/or pathnames (i.e. the directories the files are stored in - all of them up to the root directory on whatever drive they are stored in) This is also a well documented issue in the user guide as well as the forums. The User guide should be where you turn to first to understand how to work with the software. It is free software and we have worked hard to provide good documentation, as well as these forums. The software is quite old at this point, and we would like to find funding to do an update. In the meantime - the software does work, albeit with a few quirks. Carla