Volume onesmask cannot be Guassian filtered with SD > 0.8

[rposert@…]

The following bug report has been submitted:
Platform:        macOS-14.1.2-x86_64-i386-64bit
ChimeraX Version: 1.7 (2023-12-19 08:36:03 UTC)
Description
Volume onesmask cannot be Guassian filtered with SD > 0.8

To reproduce:
shape cylinder
volume onesmask #1
volume gaussian #2 sDev 2

Result:
all voxels are 0 in the gaussian filtered volume

Expected result:
A cylinder with softened edges depending on the sDev value

Log:
> ui mousemode right zoom

> volume defaultvalues initialColors
> #00a4c2,#fbbd00,#a00000,#ea7100,#007d31,#1d1f5e

> style stick

Changed 0 atom styles  

> cofr centerOfView

> graphics selection color blue width 6

> volume defaultvalues limitVoxelCount false voxelLimitForPlane
> 1000000000000000 voxelLimitForOpen 1000000000000000 saveSettings true

Saved volume settings  

> alias map_sphere surface unzone ##~num_residues; sel; close #10000; marker
> #10000 position cofr; sel ~sel; surface zone ##~num_residues nearAtoms sel
> distance $1; close #10000

> alias map_unsphere surface unzone ##~num_residues

UCSF ChimeraX version: 1.7 (2023-12-19)  
© 2016-2023 Regents of the University of California. All rights reserved.  
How to cite UCSF ChimeraX  

> open /Users/rposert/Downloads/cryosparc_P57_J19_volume_map.mrc format mrc

Opened cryosparc_P57_J19_volume_map.mrc as #1, grid size 256,256,256, pixel
1.18, shown at level 0.0503, step 1, values float32  

> shape cylinder center 125,125,108 radius 50 height 40 caps true

> volume onesmask #2 onGrid #1 fullMap true padd 5

Expected a keyword  

> help vol onesmask

> volume onesmask #2 onGrid #1 pad 5

Opened cryosparc_P57_J19_volume_map.mrc masked as #3, grid size 256,256,256,
pixel 1.18, shown at step 1, values int8  

> volume gaussian #3 sDev 2

Opened cryosparc_P57_J19_volume_map.mrc masked gaussian as #4, grid size
256,256,256, pixel 1.18, shown at step 1, values int8  

> volume fourier #4

Opened cryosparc_P57_J19_volume_map.mrc masked gaussian FT as #5, grid size
256,256,256, pixel 1.18, shown at step 1, values float32  

> volume #5 level 0.174

> close #5

> close #4

> volume #3 level 0.7361

> volume #1 level 0.03849

> close #3

> close

> shape cylinder

> volume onesmask #1

Opened mask masked as #2, grid size 101,101,51, pixel 0.02, shown at step 1,
values int8  

> volume gaussian #2 sDev 2

Opened mask masked gaussian as #3, grid size 101,101,51, pixel 0.02, shown at
step 1, values int8  




OpenGL version: 4.1 Metal - 88
OpenGL renderer: Apple M2 Max
OpenGL vendor: Apple

Python: 3.11.2
Locale: UTF-8
Qt version: PyQt6 6.3.1, Qt 6.3.1
Qt runtime version: 6.3.2
Qt platform: cocoa
Hardware:

    Hardware Overview:

      Model Name: Mac
      Model Identifier: Mac14,6
      Model Number: Z17500103LL/A
      Chip: Unknown
      Total Number of Cores: 12 (8 performance and 4 efficiency)
      Memory: 64 GB
      System Firmware Version: 10151.41.12
      OS Loader Version: 10151.41.12

Software:

    System Software Overview:

      System Version: macOS 14.1.2 (23B92)
      Kernel Version: Darwin 23.1.0
      Time since boot: 54 days, 14 hours, 59 minutes

Graphics/Displays:

    Apple M2 Max:

      Chipset Model: Apple M2 Max
      Type: GPU
      Bus: Built-In
      Total Number of Cores: 30
      Vendor: Apple (0x106b)
      Metal Support: Metal 3
      Displays:
        Color LCD:
          Display Type: Built-in Liquid Retina XDR Display
          Resolution: 3456 x 2234 Retina
          Main Display: Yes
          Mirror: Off
          Online: Yes
          Automatically Adjust Brightness: Yes
          Connection Type: Internal


Installed Packages:
    alabaster: 0.7.13
    appdirs: 1.4.4
    appnope: 0.1.3
    asttokens: 2.4.1
    Babel: 2.14.0
    backcall: 0.2.0
    beautifulsoup4: 4.11.2
    blockdiag: 3.0.0
    blosc2: 2.0.0
    build: 0.10.0
    certifi: 2022.12.7
    cftime: 1.6.3
    charset-normalizer: 3.3.2
    ChimeraX-AddCharge: 1.5.13
    ChimeraX-AddH: 2.2.5
    ChimeraX-AlignmentAlgorithms: 2.0.1
    ChimeraX-AlignmentHdrs: 3.4.1
    ChimeraX-AlignmentMatrices: 2.1
    ChimeraX-Alignments: 2.12.1
    ChimeraX-AlphaFold: 1.0
    ChimeraX-AltlocExplorer: 1.1.1
    ChimeraX-AmberInfo: 1.0
    ChimeraX-Arrays: 1.1
    ChimeraX-Atomic: 1.49.1
    ChimeraX-AtomicLibrary: 12.1.3
    ChimeraX-AtomSearch: 2.0.1
    ChimeraX-AxesPlanes: 2.3.2
    ChimeraX-BasicActions: 1.1.2
    ChimeraX-BILD: 1.0
    ChimeraX-BlastProtein: 2.1.2
    ChimeraX-BondRot: 2.0.4
    ChimeraX-BugReporter: 1.0.1
    ChimeraX-BuildStructure: 2.10.5
    ChimeraX-Bumps: 1.0
    ChimeraX-BundleBuilder: 1.2.2
    ChimeraX-ButtonPanel: 1.0.1
    ChimeraX-CageBuilder: 1.0.1
    ChimeraX-CellPack: 1.0
    ChimeraX-Centroids: 1.3.2
    ChimeraX-ChangeChains: 1.1
    ChimeraX-CheckWaters: 1.3.2
    ChimeraX-ChemGroup: 2.0.1
    ChimeraX-Clashes: 2.2.4
    ChimeraX-ColorActions: 1.0.3
    ChimeraX-ColorGlobe: 1.0
    ChimeraX-ColorKey: 1.5.5
    ChimeraX-CommandLine: 1.2.5
    ChimeraX-ConnectStructure: 2.0.1
    ChimeraX-Contacts: 1.0.1
    ChimeraX-Core: 1.7
    ChimeraX-CoreFormats: 1.2
    ChimeraX-coulombic: 1.4.2
    ChimeraX-Crosslinks: 1.0
    ChimeraX-Crystal: 1.0
    ChimeraX-CrystalContacts: 1.0.1
    ChimeraX-DataFormats: 1.2.3
    ChimeraX-Dicom: 1.2
    ChimeraX-DistMonitor: 1.4
    ChimeraX-DockPrep: 1.1.3
    ChimeraX-Dssp: 2.0
    ChimeraX-EMDB-SFF: 1.0
    ChimeraX-ESMFold: 1.0
    ChimeraX-FileHistory: 1.0.1
    ChimeraX-FunctionKey: 1.0.1
    ChimeraX-Geometry: 1.3
    ChimeraX-gltf: 1.0
    ChimeraX-Graphics: 1.1.1
    ChimeraX-Hbonds: 2.4
    ChimeraX-Help: 1.2.2
    ChimeraX-HKCage: 1.3
    ChimeraX-IHM: 1.1
    ChimeraX-ImageFormats: 1.2
    ChimeraX-IMOD: 1.0
    ChimeraX-IO: 1.0.1
    ChimeraX-ItemsInspection: 1.0.1
    ChimeraX-IUPAC: 1.0
    ChimeraX-Label: 1.1.8
    ChimeraX-ListInfo: 1.2.2
    ChimeraX-Log: 1.1.6
    ChimeraX-LookingGlass: 1.1
    ChimeraX-Maestro: 1.9.1
    ChimeraX-Map: 1.1.4
    ChimeraX-MapData: 2.0
    ChimeraX-MapEraser: 1.0.1
    ChimeraX-MapFilter: 2.0.1
    ChimeraX-MapFit: 2.0
    ChimeraX-MapSeries: 2.1.1
    ChimeraX-Markers: 1.0.1
    ChimeraX-Mask: 1.0.2
    ChimeraX-MatchMaker: 2.1.2
    ChimeraX-MCopy: 1.0
    ChimeraX-MDcrds: 2.6
    ChimeraX-MedicalToolbar: 1.0.2
    ChimeraX-Meeting: 1.0.1
    ChimeraX-MLP: 1.1.1
    ChimeraX-mmCIF: 2.12.1
    ChimeraX-MMTF: 2.2
    ChimeraX-Modeller: 1.5.13
    ChimeraX-ModelPanel: 1.4
    ChimeraX-ModelSeries: 1.0.1
    ChimeraX-Mol2: 2.0.3
    ChimeraX-Mole: 1.0
    ChimeraX-Morph: 1.0.2
    ChimeraX-MouseModes: 1.2
    ChimeraX-Movie: 1.0
    ChimeraX-Neuron: 1.0
    ChimeraX-Nifti: 1.1
    ChimeraX-NRRD: 1.1
    ChimeraX-Nucleotides: 2.0.3
    ChimeraX-OpenCommand: 1.13.1
    ChimeraX-OpenCommands: 1.1
    ChimeraX-PDB: 2.7.3
    ChimeraX-PDBBio: 1.0.1
    ChimeraX-PDBLibrary: 1.0.3
    ChimeraX-PDBMatrices: 1.0
    ChimeraX-PickBlobs: 1.0.1
    ChimeraX-Positions: 1.0
    ChimeraX-PresetMgr: 1.1
    ChimeraX-PubChem: 2.1
    ChimeraX-ReadPbonds: 1.0.1
    ChimeraX-Registration: 1.1.2
    ChimeraX-RemoteControl: 1.0
    ChimeraX-RenderByAttr: 1.1
    ChimeraX-RenumberResidues: 1.1
    ChimeraX-ResidueFit: 1.0.1
    ChimeraX-RestServer: 1.2
    ChimeraX-RNALayout: 1.0
    ChimeraX-RotamerLibMgr: 4.0
    ChimeraX-RotamerLibsDunbrack: 2.0
    ChimeraX-RotamerLibsDynameomics: 2.0
    ChimeraX-RotamerLibsRichardson: 2.0
    ChimeraX-SaveCommand: 1.5.1
    ChimeraX-SchemeMgr: 1.0
    ChimeraX-SDF: 2.0.2
    ChimeraX-Segger: 1.0
    ChimeraX-Segment: 1.0.1
    ChimeraX-SelInspector: 1.0
    ChimeraX-SeqView: 2.11
    ChimeraX-Shape: 1.0.1
    ChimeraX-Shell: 1.0.1
    ChimeraX-Shortcuts: 1.1.1
    ChimeraX-ShowSequences: 1.0.2
    ChimeraX-SideView: 1.0.1
    ChimeraX-Smiles: 2.1.2
    ChimeraX-SmoothLines: 1.0
    ChimeraX-SpaceNavigator: 1.0
    ChimeraX-StdCommands: 1.12.3
    ChimeraX-STL: 1.0.1
    ChimeraX-Storm: 1.0
    ChimeraX-StructMeasure: 1.1.2
    ChimeraX-Struts: 1.0.1
    ChimeraX-Surface: 1.0.1
    ChimeraX-SwapAA: 2.0.1
    ChimeraX-SwapRes: 2.2.2
    ChimeraX-TapeMeasure: 1.0
    ChimeraX-TaskManager: 1.0
    ChimeraX-Test: 1.0
    ChimeraX-Toolbar: 1.1.2
    ChimeraX-ToolshedUtils: 1.2.4
    ChimeraX-Topography: 1.0
    ChimeraX-ToQuest: 1.0
    ChimeraX-Tug: 1.0.1
    ChimeraX-UI: 1.33.2
    ChimeraX-uniprot: 2.3
    ChimeraX-UnitCell: 1.0.1
    ChimeraX-ViewDockX: 1.3.2
    ChimeraX-VIPERdb: 1.0
    ChimeraX-Vive: 1.1
    ChimeraX-VolumeMenu: 1.0.1
    ChimeraX-vrml: 1.0
    ChimeraX-VTK: 1.0
    ChimeraX-WavefrontOBJ: 1.0
    ChimeraX-WebCam: 1.0.2
    ChimeraX-WebServices: 1.1.3
    ChimeraX-Zone: 1.0.1
    colorama: 0.4.6
    comm: 0.2.0
    contourpy: 1.2.0
    cxservices: 1.2.2
    cycler: 0.12.1
    Cython: 0.29.33
    debugpy: 1.8.0
    decorator: 5.1.1
    docutils: 0.19
    executing: 2.0.1
    filelock: 3.9.0
    fonttools: 4.47.0
    funcparserlib: 2.0.0a0
    glfw: 2.6.4
    grako: 3.16.5
    h5py: 3.10.0
    html2text: 2020.1.16
    idna: 3.6
    ihm: 0.38
    imagecodecs: 2023.9.18
    imagesize: 1.4.1
    ipykernel: 6.23.2
    ipython: 8.14.0
    ipython-genutils: 0.2.0
    ipywidgets: 8.1.1
    jedi: 0.18.2
    Jinja2: 3.1.2
    jupyter-client: 8.2.0
    jupyter-core: 5.5.1
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    lxml: 4.9.2
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    nest-asyncio: 1.5.8
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    PyOpenGL: 3.1.7
    PyOpenGL-accelerate: 3.1.7
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    tcia-utils: 1.5.1
    tifffile: 2023.7.18
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    tzdata: 2023.3
    urllib3: 2.1.0
    wcwidth: 0.2.12
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    wheel: 0.38.4
    wheel-filename: 1.4.1
    widgetsnbextension: 4.0.9

[pett]

Reported by Rich Posert

[Tom Goddard]

As you can see in the ChimeraX Log panel your ones mask has values that are 8-bit integers and when you Gaussian smooth that it makes a copy keeping the same 8-bit integer type. If you smooth values that are 1 and 0 you will get values less than 0.5 with enough smoothing so all values will be 0 since they are integers. To make the gaussian smoothed version floating point use

volume gaussian #2 sDev 2 value float32

> volume onesmask #1

Opened mask masked as #2, grid size 101,101,51, pixel 0.02, shown at step 1,
values int8  

> volume gaussian #2 sDev 2

Opened mask masked gaussian as #3, grid size 101,101,51, pixel 0.02, shown at
step 1, values int8