---
title: 5.2 Change log
description: "###### **Changes in 2.4.9 [ 01_02_24 ]** – Extension of licence to September 2025 – Improvement of spatial graphing tool – Addition of spatial wobble metrics of mean variation, standard deviation variation, and coefficient of variation, and live plots of…"
url: "https://isovists.org/user-guide/5-2-change-log/"
updated: "2025-03-31"
category: 5 Reference and Support
---

# 5.2 Change log

###### **Changes in 2.4.9 [ 01_02_24 ]**

– Extension of licence to September 2025
– Improvement of spatial graphing tool
– Addition of spatial wobble metrics of mean variation, standard deviation variation, and coefficient of variation, and live plots of wobble characteristics
– Addition of time-to-contact array overlay
– Addition of motor containment metric
– Addition of drift centroid to point isovist data overlay
– Addition of export of agent trail x-y data
– Fix to point isovist positioning to allow floating point precision
– Addition of basic image import of plans (jpg, tiff, and png formats)
– Fix to allow selection of isovist cascade location whilst in 3d view
– Addition of alternative comparison spectra in comparisons menu
– Addition of root location recording and step depth exports
– Fix to allow selection of isovist cascade location whilst in 3d view
– Reduction of file size on .isovist file save

###### **Changes in 2.4.8 [ 23_06_22 ]**

- Minor bug fix to export of isovist point data csv file
- Fix to occasional bug in depth search algorithm when linkers enabled

###### **Changes in 2.4.7 [ 01_05_22 ]**

- Minor bug fixes
- Extension of licence to 01/09/2022

###### **Changes in 2.4.6 [ 01_02_22 ]**

- Re-enabled Minkowski models
- Re-enabled Threshold finder
- Resolution of crash on intel gpu chips (finally!!)
- Extension of licence to 01/05/2022
- Resolution of performance issues and minor bugs
- Press X and then use numbers 1, 3, 6, 9 & 0 for a hidden treat

###### **2.4.5 [ 01_11_21 ]**

- Complete rework of core calculation engines for local and visual depth measures
- Accelerated performance for complex urban footprints
- Accuracy of local measures increased
- Memory improvements on loading and closing drawing tabs
- Resolution of minor bugs generally

###### **2.4.3 [ 06_04_21 ]**

- Addition of isovist measure roses
- Control field renamed Overt Control and unitised
- Addition of Closed Perimeter, Co-visibility, Covert Control, and Counterpoint fields
- Removal of Curvature and Controllability fields
- Improvement of loading costs for lower memory GPU sets
- Resolution of minor bugs generally

###### **2.4.2 [ 01_02_21 ]**

- Licence extended until April 2021

###### **2.4.1 [ 29_11_20 ]**

- Licence extended until Feb 2021
- Resolution of minor bugs on comparison chart switching

###### **2.4.0 [ 23_10_20 ]**

- Major version release
- Complete re-write of core calculation algorithms
- Layer support added for dxf dwg import
- Resolution of numerous minor bugs on field tab switching etc
- Improvement of GUI operation and appearance

###### **2.3.9 [ 01_08_20 ]**

- General fixes in line with User Guide re-write 
- Version extended until 01/12/2020

###### **2.3.8 [ 23_06_20 ]**

- Internal horizon added to isovist generation
- Choice measure enabled across multiple floors
- Edits to occlusivity calculation to improve fidelity
- Addition of local spatial curvature measure
- General bug fixes
- Version extended until 01/09/2020

###### **2.3.7 [ 14_03_20 ]**

- Version extended to August 2020
- General bug fixes

###### **2.3.6 [ 02_02_20 ]**

- ‘Contact us’ option enabled
- ‘Choice’ measure enabled
- Point isovist location import and data export enabled
- Fix to bugs on isovist agent trails and heat maps
- Delete button allows removal of point isovists
- Fix to bugs on Metric and Angular depth searches in some plans
- Improvements to absolute value overlay
- General bug fixes

###### **2.3.5 [ 14_12_19 ]**

- Minkowski model calculations and exports enabled
- Fix to bugs on Path analysis calculations 
- General bug fixes

###### **2.3.4 [ 15_11_19 ]**

- Massed agent trails enabled
- Massed agent visibility enabled
- Fix to depth to point requests
- General bug fixes

###### **2.3.3 [ 19_10_19 ]**

- Redesign of window mode control bar
- Fix to linkers bug on visual depth calculations
- Fix to data export (x,y) coordinate values
- Improvement of partitions calculations 
- Fix to flux calculations

###### **2.3.2 [ 01_10_19 ]**

- Major rework of calculation engine to replace openCl with openGl basis
- Addition of basic/advanced field calculation option
- Refinement of drift, variance and skewness definitions/calculations
- Addition of point isovist data dialogue option
- Reduction of runtime memory overheads
- Refinement of absolute value overlays to match scale information
- Code structure tidy up

###### **2.3.1 [ 01_08_19 ]**

- Licence extended until 01/10/19

###### **2.3.0 [ 01_07_19 ]**

- Licence extended until 01/10/19- Improvements to menu sizing on high resolution screens
- Improvements to startup reliability on PC
- Improvements to graphics memory use on PC
- Fix to crash on comparative analysis mode on PC
- Improvements to calculations of spatial partitions overlay
- Improvements to image export functions
- Multiple path chart value overlays enabled
- Debugging .txt file record enabled
- Visibility renamed to directed visibility
- Integration and mean visual depth overlay and chart values re-enabled

###### **2.2.6 [ 01_06_19 ]**

- Occasional crash on import fixed
- Licence extended until 01/08/19

###### **2.2.5 [ 24_04_19 ]**

- Threading memory use improvements
- Optimal path overlays enabled
- Minimal set searching enabled
- Drift field vectors amended to reflect true drift headings
- Fix to occasional error on dwg and dxf block imports
- Fix to crash on super high resolution screens
- Fix to partition calculation error
- Fix to display of 3D mean visual depth and integration fields

###### **2.2.4 [ 25_03_19 ]**

- Dxf and Dwg block import now supported
- Fix to absolute value overlay errors
- Licence extended to 01/05/2019

###### **2.2.3 [ 18_03_19 ]**

- Dxf and Dwg import support
- Optimised plan drawing functions
- Fix to rare isovist geometry errors

###### **2.2.2 [ 11_02_19 ]**

- Improved import and flood sampling processes
- Optimised integration and step depth calculations
- Addition of record and export of step depths
- Fix to occasional crash on plan load and resampling
- Fix to rare isovist geometry errors

###### **2.2.1 [ 03_02_19 ]**

- Fix for crashes on import and tab switching when isovists are displayed
- Fix for step depth crossover between tabs when switching tabs
- Fix for crash of scan progress /scan blackout on tab switching
- Fix for y-axis inversion of CSV data
- Fix for isovist geometry errors due to infinite line segments in some plans
- Fix for spectrum in zero value regions in mean metric depth and mean angular depth scans

###### **2.2.0 [ 21_12_18 ]**

- Major reworking of all plan import and optimisation processes
- Integration, Mean Visual Depth, and Visual Depth to location analysis algorithms rewritten to operate via geometric isovist methods
- Accuracy and definition of Angular depth algorithms increased
- Inter-visibility analysis via histogram overlay now included

###### **2.1.10 [ 07_11_18 ]**

- RRA calculation inverted to align integration values with DepthMap
- Integration D-value related to drawing scale bar to allow cross plan comparisons
- User mouse scroll sensitivity option added to set menu
- Ability to select and drag copy linkers added using control button

###### **2.1.9 [ 22_10_18 ]**

- version licence extended until 01/01/19
- added 3d field 'landscape' representations in plan space
- added undo delete option to line drawing tools
- aligned isovist heading to path direction on path analysis
- improved legibility of absolute values overlay
- prevented escape button causing app shut-down
- fixed depth to location error on tab switching
- improved allocation of spatial linker tools
- improved plan resampling fidelity
- improved csv export stability on PC
- improved isovist file save stability on PC

###### **2.1.8 [ 06_09_18 ]**

- version licence extended until 01/11/18
- fixed occasional bug on global field calculation on MacBook Air models

###### **2.1.7 [ 17_07_18 ]**

- scan edge expanded from plan import edge
- scan edge removed from scan field results
- plan import fixed to allow group names in upper or lower case
- maximum number of plan linkers increased to 128
- comparison charts click-drag spin enabled
- minor bug on spatial comparisons display resolved
- absolute point data values enabled as overlay option
- calculation enabled on iris generation intel gpu chip sets
- resolution of visibility, control and controllability calculations improved
- stability when switching between tabs on PC improved
- stability of export and save functions on PC improved
- minor memory efficiency improvements

###### **2.1.6 [ 30_06_18 ]**

- image export updated to provide high resolution and vector line pdfs
- pc stability increased
- crash on micro sampling resolved
- minor calculation speed improvements

###### **2.1.5 [ 28_05_18 ]**

- drawing menu containing plan edit tools added
- scan setup tools relocated to drawing menu
- user defined scale added to drawing menu
- loading blinker set to fade
- heading arrows included for isovists with a sweep of less than 180 degrees
- circular horizon added to visibility scans
- scan region selection optimised
- scan resolution set to require scan region re-selection by user
- integration HH slider set to logarithmic scale
- angular step depth maximal value range increased
- local and global scan functions optimised
- sweep and heading bug fixed for isovist scans with a sweep of less than 180 degrees
- escape button crash fixed
- occasional save crash bugs reduced

###### **2.1.4 [ 15_05_18 ]**

- regional isovist calculation tool added
- angular depth and angular mean depth added
- control and controllability measures improved
- zoom inversion fixed
- pan tool added
- file naming dialogue added

###### **2.1.3 [ 04_05_18 ]**

- control and controllability measures now included
- spectrum fade out at minima option added
- occasional rare isovist calculation errors debugged

###### **2.1.2 [ 30_04_18 ]**

- isovist visibility scanning now included
- integration (HH) now included
- plan segment downsampling improved
- user added segments now affect scan base choice
- user menu rearranged and rationalised
- error on link propagation fixed
- error on link restoring from second tab fixed
- error on .isovist file load fixed
- hang error on exit fixed

###### **2.1.1 [ 13_04_18 ]**

- option to turn off plan added
- tiff export at full analysis resolution enabled
- spatial links improved
- tab switching improved
- underlying search data structures refined to improve efficiency and speed

###### **2.1.0 [ 30_03_18 ]**

- path analysis chart tools added
- variance, skew and average radial measures added
- occlusion measure redefined to increase accuracy
- scans updated to include restricted and directed isovist settings
- grayscale and colour invert settings included for scans
- scan radial resolution setting added
- 'persistent threshold' calculation and overlay added
- isovist radial display option included
- isovist agents provided with 'body' visibility
- changes to .isovist file format

###### **2.0.9 [ 05_03_18 ]**

- occlusivity and compactness measures refined to improve fidelity in urban figure grounds
- edit to scan region selection to improve selection in urban figure grounds
- fix to scatter plot setup to account for high value spreads
- fix to minor spectrum slider update error

###### **2.0.8 [ 25_02_18 ]**

- major revision to allow multiple scans to be opened simultaneously
- major revision to include .isovist and .isospect file formats to allow scan or spectrum saving and reopening
- threading of file open/close processes
- fix to PC file extension errors to include default formats of .tiff, .csv, etc
- inclusion of 3d scatter charts in comparisons analysis
- fix to some long plan segment recalculations on scan resolution resizing

###### **2.0.7 [ 19_01_18 ]**

- addition of 'annotations' overlay layer to plan import and display
- improvement of import optimisation functions
- review and improvement of reflection geometry calculations

###### **2.0.6 [ 14_01_18 ]**

- mouse selection of step depth to location calculations enabled
- visual step depth to location max-min and averages implemented

###### **2.0.5 [ 09_01_18 ]**

- comparison charts re-enabled

###### **2.0.4 [ 07_01_18 ]**

- inclusion of all solid walls within scan when visible space is activated
- refinement of 'viewed depth' calculations
- some optimisation of scan calculations on mac version
- debugging of mouse zoom input

###### **2.0.3 [ 28_12_17 ]**

- implementation of isovist horizons within scan measures
- implementation of 'viewed depth' and 'view depth' as sub-category of visibility global measures
- minor variation to lower end of blue/black spectrum

###### **2.0.2 [ 20_12_17 ]**

- implementation of user defined resolution settings
- optimisation of import plans to suit defined resolution
- inclusion of refined spectrum thresholding
- fix to allow reset of scan on selection of visible/reflected space draw settings

###### **2.0.1 [ 09_12_17 ]**

- inclusion of 'visibility' global depth measures to scan analysis
- solution to bug that caused a crash on detection of mal-formed segments in an imported plan
- inclusion of full screen/window switching based on user feedback
- inclusion of summary visual depth statistics based on user feedback
- minor change to spectrum mix; darker tone at blue end

###### **2.0.0 [ 01_12_17 ]**

- major upgrade release
- adoption of OpenCl standard methods for all scan analysis
- inclusion of 'accessibility' global depth measures to scan analysis
- revision, review and restructure of all user interface issues
- reworking of all import processes to improve reliability
- reworking of numeric export standards to align to DepthMap
- expansion of scan spectrum options

###### **1.0.3 [ 02_10_17 ]**

- revision of field spectrums to include low values as fade to black

###### **1.0.2 [ 31_07_17 ]**

- revision of import options to simplify import process

###### **1.0.1 [ 12_07_17 ]**

- fix to exports to correct errors in data formatting and values
- fix to isovist calculations to improve fidelity of geometries relative to small line fragments

###### **1.0.0  [ 06_07_17 ]**

- initial public release