# \#mrml **URL:** https://discourse.slicer.org/tag/mrml/112.md [Latest](https://discourse.slicer.org/latest.md) · [Categories](https://discourse.slicer.org/categories.md) · [Tags](https://discourse.slicer.org/tags.md) --- ## [Why won't my mrml file open in 3D slicer, or my stl file become visible?](https://discourse.slicer.org/t/why-wont-my-mrml-file-open-in-3d-slicer-or-my-stl-file-become-visible/47172)
**Author:** [@Emerson](https://discourse.slicer.org/u/Emerson)\ **Replies:** 1\ **Last updated:** [May 29, 2026, 2:34pm UTC](https://discourse.slicer.org/t/why-wont-my-mrml-file-open-in-3d-slicer-or-my-stl-file-become-visible/47172 "2026-05-29T14:34:17Z")
I was trying to open an mrml file I have saved, and while it opened the app it did not open the file or show up anywhere. I tried again with the stl file and while it showed up under ‘data’ (which is farther than I got w… --- ## [Is there any way to know if a vtkMRMLNode has been renamed?](https://discourse.slicer.org/t/is-there-any-way-to-know-if-a-vtkmrmlnode-has-been-renamed/45717)
**Author:** [@Suhaim](https://discourse.slicer.org/u/Suhaim)\ **Replies:** 5\ **Last updated:** [January 13, 2026, 3:55am UTC](https://discourse.slicer.org/t/is-there-any-way-to-know-if-a-vtkmrmlnode-has-been-renamed/45717 "2026-01-13T03:55:36Z")
Hi all, If you create a markup node(vtkMRMLMarkupsNode) and add control points to it, the control points are named using a default format(“%N-%d”) with respect to the current name of the markup node. Renaming a markup … --- ## [Problem Reopening mrml](https://discourse.slicer.org/t/problem-reopening-mrml/45319)
**Author:** [@acrespo](https://discourse.slicer.org/u/acrespo)\ **Replies:** 2\ **Last updated:** [December 3, 2025, 2:18pm UTC](https://discourse.slicer.org/t/problem-reopening-mrml/45319 "2025-12-03T14:18:38Z")
Slicer Version: 5.8.1 Macbook Pro with 356 GB available Hello! I am very new to 3DSlicer and forums as a whole. I was hoping for some help as I have run into an issue with reuploading my segmented CT scan. I made sure … --- ## [Error writing MRML and MRB files on mapped drive](https://discourse.slicer.org/t/error-writing-mrml-and-mrb-files-on-mapped-drive/43029)
**Author:** [@ezgimercan](https://discourse.slicer.org/u/ezgimercan)\ **Replies:** 1\ **Last updated:** [May 22, 2025, 3:54pm UTC](https://discourse.slicer.org/t/error-writing-mrml-and-mrb-files-on-mapped-drive/43029 "2025-05-22T15:54:08Z")
I am using latest stable, 5.8.1 on Ubuntu 22.04. I have some research drives mounted with autofs (nfs). Slicer complains that the locations is not writable when I try to save MRB or MRML files. I can save/write/export ev… --- ## [How to Enable Maximum Intensity Projection (MIP) Automatically for MRML Presets?](https://discourse.slicer.org/t/how-to-enable-maximum-intensity-projection-mip-automatically-for-mrml-presets/40679)
**Author:** [@LounesAl](https://discourse.slicer.org/u/LounesAl)\ **Replies:** 6\ **Last updated:** [December 17, 2024, 10:43am UTC](https://discourse.slicer.org/t/how-to-enable-maximum-intensity-projection-mip-automatically-for-mrml-presets/40679 "2024-12-17T10:43:48Z")
Hello, I have created custom volume rendering presets in an MRML file. Below is an example structure: \ \ **Author:** [@Karthik](https://discourse.slicer.org/u/Karthik)\ **Replies:** 6\ **Last updated:** [December 6, 2023, 5:37am UTC](https://discourse.slicer.org/t/access-mrmlscene-from-terminal-using-pythonslicer/21981 "2023-12-06T05:37:14Z") Hi everybody. I have used PythonSlicer from terminal before. I’ve used it to run scripts using the environment and dependencies that come with slicer. Ex: ./PythonSlicer ~/test.py Now I want to run a python script usin… --- ## [Custom View in 3D Slicer](https://discourse.slicer.org/t/custom-view-in-3d-slicer/31913)
**Author:** [@Gaelle\_Leroux](https://discourse.slicer.org/u/Gaelle_Leroux)\ **Replies:** 1\ **Last updated:** [September 26, 2023, 7:17pm UTC](https://discourse.slicer.org/t/custom-view-in-3d-slicer/31913 "2023-09-26T19:17:25Z")
Hello ! I want to develop an extension that will have a custom view. The view consist of three 3D views side by side. In one view I want to have a source model, in the second view I want to have the target model and in … --- ## [Custom MRML Node with Python](https://discourse.slicer.org/t/custom-mrml-node-with-python/27633)
**Author:** [@kleingeo](https://discourse.slicer.org/u/kleingeo)\ **Replies:** 5\ **Last updated:** [February 13, 2023, 6:13pm UTC](https://discourse.slicer.org/t/custom-mrml-node-with-python/27633 "2023-02-13T18:13:02Z")
Is there a way to define a custom MRML node that can be used with a module developed with the python backend? --- ## [Opening Downloaded '.mrml' Files](https://discourse.slicer.org/t/opening-downloaded-mrml-files/26351)
**Author:** [@JacobD](https://discourse.slicer.org/u/JacobD)\ **Replies:** 2\ **Last updated:** [January 11, 2023, 9:51pm UTC](https://discourse.slicer.org/t/opening-downloaded-mrml-files/26351 "2023-01-11T21:51:04Z")
Regarding ‘.mrml’ files downloaded from a Google Drive folder, when attempting to load them to view completed segmentations, the segmentation does not appear, and only a section of the scanned image appears. When attemp… --- ## [Embedding URI in a mrml scene file, for viewing the mrml scene on a remote slicer application](https://discourse.slicer.org/t/embedding-uri-in-a-mrml-scene-file-for-viewing-the-mrml-scene-on-a-remote-slicer-application/25373)
**Author:** [@Rajesh\_Ds](https://discourse.slicer.org/u/Rajesh_Ds)\ **Replies:** 11\ **Last updated:** [October 20, 2022, 3:00pm UTC](https://discourse.slicer.org/t/embedding-uri-in-a-mrml-scene-file-for-viewing-the-mrml-scene-on-a-remote-slicer-application/25373 "2022-10-20T15:00:29Z")
This is a sample .mrml scene file. It is having a local filepath embedded in it which points to the niftii file corresponding to a particular segmentation result shown in the mrml scene. Is it possible to replace th… --- ## [Loading mrml files fails and stalls](https://discourse.slicer.org/t/loading-mrml-files-fails-and-stalls/21069)
**Author:** [@lucast4](https://discourse.slicer.org/u/lucast4)\ **Replies:** 3\ **Last updated:** [December 16, 2021, 6:25pm UTC](https://discourse.slicer.org/t/loading-mrml-files-fails-and-stalls/21069 "2021-12-16T18:25:07Z")
Loading an MRML file (by dragging and dropping) stalls. The progress bar will reach a specific number (e…g, 99%) and won’t load. Then usually Slicer will crash. I have on the order of 10s to couple hundred objects that a… --- ## [Re-opening mrml error code - unmatched volume size](https://discourse.slicer.org/t/re-opening-mrml-error-code-unmatched-volume-size/19807)
**Author:** [@ni5h](https://discourse.slicer.org/u/ni5h)\ **Replies:** 5\ **Last updated:** [September 23, 2021, 1:47pm UTC](https://discourse.slicer.org/t/re-opening-mrml-error-code-unmatched-volume-size/19807 "2021-09-23T13:47:47Z")
Hi, We have completed a number of annotations segmenting abdominal tissue on one vertebral level. We are unable however to reopen the mrml file we have saved, there is an intermittent error appearing suggesting the load… --- ## [QT+MRML develop](https://discourse.slicer.org/t/qt-mrml-develop/18976)
**Author:** [@yuguoxin](https://discourse.slicer.org/u/yuguoxin)\ **Replies:** 1\ **Last updated:** [July 31, 2021, 10:39pm UTC](https://discourse.slicer.org/t/qt-mrml-develop/18976 "2021-07-31T22:39:27Z")
main.cpp mainwindow.cpp when running the exe, exception happen can you tell me why? --- ## [Discussion about default display and storage nodes](https://discourse.slicer.org/t/discussion-about-default-display-and-storage-nodes/4595)
**Author:** [@cpinter](https://discourse.slicer.org/u/cpinter)\ **Replies:** 0\ **Last updated:** [October 30, 2018, 6:15pm UTC](https://discourse.slicer.org/t/discussion-about-default-display-and-storage-nodes/4595 "2018-10-30T18:15:38Z")
Thread for continuing discussion in PR1029: @jcfr: Should we simply disable the creation of node using node constructor from both C++ and python ? That would be consistent with the new behavior we are promoting. @lass… --- ## [Trying to update a slicer volume node from SimpleITKImage](https://discourse.slicer.org/t/trying-to-update-a-slicer-volume-node-from-simpleitkimage/2032)
**Author:** [@drusmanbashir](https://discourse.slicer.org/u/drusmanbashir)\ **Replies:** 6\ **Last updated:** [March 1, 2021, 11:07am UTC](https://discourse.slicer.org/t/trying-to-update-a-slicer-volume-node-from-simpleitkimage/2032 "2021-03-01T11:07:09Z")
Operating system: Window 7 Slicer version: 4.8.1 Hi All, I am a newbie. I am trying to develop a segmentation module using python. The main function takes as input a vtkMRMLLabelMapVolumeNode and a vtkMRMLScalarVolum… --- ## [MRB File Format - Structure and Naming](https://discourse.slicer.org/t/mrb-file-format-structure-and-naming/10624)
**Author:** [@ArneGroskurth](https://discourse.slicer.org/u/ArneGroskurth)\ **Replies:** 16\ **Last updated:** [April 7, 2020, 5:11pm UTC](https://discourse.slicer.org/t/mrb-file-format-structure-and-naming/10624 "2020-04-07T17:11:45Z")
Hi there, is there any documentation for the \*.mrb file format? I would like to implement an interface to this format for another application but would ideally not have to reverse-engineer the format. And if there is … --- ## [Are MRML attributes saved in Sequences?](https://discourse.slicer.org/t/are-mrml-attributes-saved-in-sequences/7698)
**Author:** [@ungi](https://discourse.slicer.org/u/ungi)\ **Replies:** 6\ **Last updated:** [July 22, 2019, 10:46pm UTC](https://discourse.slicer.org/t/are-mrml-attributes-saved-in-sequences/7698 "2019-07-22T22:46:52Z")
Hi, Are MRML node attributes saved and loaded by Sequences? My suspicion is that they are not. I tried adding attributes to an image and scrolling the Sequence Browser to new images. But the attributes stayed. I also tr… --- ## [Saving File Problems for Segmentation Project](https://discourse.slicer.org/t/saving-file-problems-for-segmentation-project/5888)
**Author:** [@dekaya](https://discourse.slicer.org/u/dekaya)\ **Replies:** 2\ **Last updated:** [February 23, 2019, 2:52am UTC](https://discourse.slicer.org/t/saving-file-problems-for-segmentation-project/5888 "2019-02-23T02:52:19Z")
Operating system: Mac OS Slicer version: 4.10.1 Actual behavior: I have a problem with how Slicer saves my files. They either become too large as bundle (I.e., doubling in size for each iterative save) or they’re in mu…