The LS-PrePost application includes new features and enhancements at Release 2026 R1 in the following areas:
Geometry updates include:
The geometry kernel has been upgraded from OCC7.0.0 to OCC7.8.0.
The CAD assembly model position error, which occurred when translated by HOOPS, has been fixed.
Geometry tessellation for IGA post models has been optimized.
When importing an IGA post file (version 1.2), tessellation and fringe is supported.
The right-click menu in the graphics viewport works for multiple parts. These can be selected by either clicking and dragging (AreaPick) over the required parts, or holding the A key and clicking parts when no dialogs are active.
Additional Python and SCL API for geometry, along with new sample codes, are available.
Transparency views for geometry parts are supported.
Measurement values from active geometry tools can be displayed in exported images and animations.
Keyword
Export YAML file with model include hierarchy. The following command exports a model's include file tree to a specified filename:
cfile command: subsystem inctreeinfo2file filenameNested Keyword RefBy items. The items listed in the RefBy dialog, which is opened from the Keyword Input Form, have been nested for easy navigation.
Keyword Data Filter Table. The Keyword Data Filter Table allows you to navigate, filter, edit, display, and compare keyword data. It enables efficient handling of large and complex LS-DYNA models.
Draw keyword entities. Toggle the eye icon in the first column to draw the keyword if it is drawable.
Right-click menu. You can select items in the Keyword Data Filter Table and then right-click to open a contextual menu of further options.
Entity Display
Improved Entity Display. *BOUNDARY_SALE_MESH_FACE boundaries can be drawn with different colors, and segments can be drawn on boundaries that are non-reflective.
Measure
Optimize segment to segment measuring. In the Measure dialog, when Item is set to , you can select the check box to optimize the algorithm when the nearest segment between Group 1 and Group 2 (in either direction) must be in the direction of the segment normal. This setting is helpful when solid elements represent the blank part for metal forming analyses.
IGA
Support *BOUNDARY_PRESCRIBED_MOTION_POINT_UVW in Entity Creation dialog. In the Entity Creation dialog, under > Prescribed Motion (BPM), the keyword option POINT_UVW is available. This is used when prescribed boundary conditions are applied to IGA shells.
Removed IGA_NURBS_2D_XYZ and IGA_FACE_XYZ entities. Removed the IGA_NURBS_2D_XYZ and IGA_FACE_XYZ entities in trimmed NURBS 3D entity for cube linear mapping. Node(control point) was removed.
Create trimmed IGA solid from STEP file. You can create a trimmed IGA solid from a STEP file automatically by enabling Create(Auto) when importing the .stp geometry model and clicking Apply. Every solid part will be converted to trimmed IGA solid respectively.
Note: This feature is supported for .stp files only.
Fringe Component and Fringe Legend
Shell thickness visualization (PostDB). You can display fringe contours on shell elements while Shell Thickness is on. This allows for a more realistic view of stress/strain distribution across the geometry.
Strain metrics. For Strain components, there is support for Tresca (max shear strain) for solid elements.
Fringe of max/min IPT selection of *INITIAL_STRESS with multiple IPT for solid elements . *INITIAL_STRESS keywords that have multiple integration points are supported in the Max/Min integration point selection option of the Fringe Component dialog.
Laminate shell results enhancements. For LSDA defined fringe components, you can load eloutdet files using the Branch drop-down menu to extract and fringe strain data across different integration points in laminate shells.
There is also a new Option drop-down menu to switch the result coordinate system between (Global system) and (Local system).
Fringe legend menu options. From the right-click menu of the Fringe legend, the following options have been added:
. Highlights the element or node with the minimum or maximum value in the model view. New Legend. Defines a new Fringe legend ( > ). From here you can define individual legend colors, the overall color palette, values, and fringe limits. Palette Colors. Sets the legend to a pre-defined color palette. You can select from Default, Turbo, Cool-warm, Plasma, Inferno, Viridis, and User File. Local Fringe legend support in split windows. User-defined Fringe legends can be used across split windows by right-clicking the legend and going to > . Across split windows, legends can vary in color, fringe level, font size, and placement within the display.
ASCII
Node classification by Set ID. In > , you can classify Node IDs in the bndout branch based on their specific Set ID. To do this, select the Highlight check box and then, in the Set Node dialog, select By Set/Grp. This helps find and select specific nodes to Plot within large datasets.
Rotational curve values unit display. You can switch the display of rotational curve values between degree and radian (default) from the Settings tab in LS-PrePost, under Configuration Settings > > > Angular System. This option influences BINOUT and ASCII curve plots of rotational-displacement, rot-velocity and rotational acceleration (nodout/rbdout).
BINOUT
Element classification by Set ID. In > , you can classify element data based on their specific Set ID. To do this, select the Highlight check box and then, in the Set Elem dialog, select By Set/Grp. This helps find and select specific elements to Plot within large datasets.
Vector Plot
Velocity vector plotting for D3DAT. You can plot velocity vectors for d3dat files.
3D Graph View
3D Rainflow visualization. Added support for Rainflow Metric plots within the 3D Graph view.
In the Application menu, the following enhancements have been made to Fragment Analysis and Occupant Safety:
Fragment Analysis for SPH. The Fragment Analysis tool supports Smoothed Particle Hydrodynamics (SPH).
Dummy Positioning enhancements. In > , the following buttons have been added:
Show dummy parts only. Displays only the parts referenced in the Dummy tree in the model view. Run Dyna. Creates discrete elements (*ELEMENT_DISCRETE) on positioning nodes and uses the LS-DYNA simulation to pull the Human Body Model (HBM) to a target posture.
General
Keyword support for reading object data. LS-PrePost can decode the following keywords for reading different object data:
Pressure. *LOAD_SHELL_ELEMENT, *LOAD_SHELL_SET, *LOAD_SEGMENT SPC. *BOUNDARY_SPC_NODE, *BOUNDARY_SPC_NODE_BIRTH_DEATH Force/Moment. *LOAD_NODE_SET, *LOAD_NODE_POINT Prescribed Motion. *BOUNDARY_PRESCRIBED_MOTION_NODE RBE3. *CONSTRAINT_INTERPOLATION Support composite layers in Shell Part objects. You can add composite layers in Shell Part objects. The following keywords can be decoded within the model tree: *PART_COMPOSITE, *PART_COMPOSITE_CONTACT, *PART_COMPOSITE_LONG, and *PART_COMPOSITE_LONG_CONTACT.
Support discrete elements and section properties in Discrete Part objects. You can add discrete elements and section properties in Discrete Part objects.
Support Mass Element objects in Parts tree. You can add mass element objects in the Parts tree.
Support Simple Airbag Models objects in Airbags object. You can add the new Simple Airbag Models object in the Airbags object.
EM
Support cell connections among replicated Unit Cells. You can add cell connections among replicated unit cells by right-clicking the Unit Cell from the Solution Explorer tree and selecting . From the Property Explorer you can then set the Connection Type, Connected Isopotentials, and Connected Cells.
Material Library
Support Plastic materials. You can define plastic materials (compression, tension) by right-clicking the UserDefined Database and selecting .
Support Rubber materials. You can define rubber materials (simplified rubber/foam) by right-clicking the UserDefined Database and selecting > .
Support constitutive equations for metal materials. You can add new constitutive equations - such as Johnson Cook, Power Law, Plasticity with Damage, and so forth - for metal materials in the UserDefined Database.
Support *MAT_MODIFIED_PIECEWISE_LINEAR_PLASTICITY in UserDefined Database. *MAT_MODIFIED_PIECEWISE_LINEAR_PLASTICITY is supported in the UserDefined metal materials.
New Structural Behavior options for Metal objects. In the UserDefined Database, Structural Behavior options for Metal objects include (*MAT_SPOTWELD_) and (*MAT_SPOTWELD_DAIMLERCHRYSLER_).
Support Spring and Damper materials. You can define Spring and Damper materials by right-clicking the UserDefined Database and selecting > .
BaoSteel material support. You can add materials from the BaoSteel folder in the Built-in Database.
lspp_forming_temp\lspp_matlib_UnitB folder materials. You can add materials from the ...\lspp_forming_temp\lspp_matlib_UnitB folder, which is located in the LS-PrePost installation path, in the Built-in Database.
Fringe
Moved Fringe legend settings. All Fringe legend settings have been moved to the Fringe legend right-click menu.
Record Plot Mode for selected parts. You can record the Plot Mode for selected parts under a fringe component object. To do this: select the parts from the tree, right-click, and then select Plot Mode followed by the required mode (for example, Shaded). From the Post Explorer tree, right-click the Components folder and select the required results view.
BINOUT
New BINOUT branches. Post Explorer supports the matsum and sbtout binout branches.
Loading the binary output. LS-PrePost supports loading the Binout, which will be searched for in current working directory.
2D Graph Viewer
Integration with 2D Graph Viewer. Post Explorer States are supported in the 2D Graph viewer. Right-click the viewport and go to Plot Manage to open the view state in the 2D Graph Viewer.
Improved point selection. Curve points that are selected in the 2D Graph menu are also displayed in the main window's XY Plot area.
Properties
Model Title options. You can define the model title using the Title Option. Options include:
By D3Plot. Sets the title based on text found in the *TITLE keyword. By Working Dir. Sets the title based on the name of the folder where the results are saved. User Defined. Allows you to enter a title manually.
General updates to LS-PrePost include:
SCL from the command line. You can run SCL from the command line.
Latest FEMUNZIP libraries. The latest FEMUNZIP libraries (version 17.1.901) are supported.
*SET_PART_TREE for FEMZIP models. FEMZIP models containing *SET_PART_TREE information in the Subset Explorer are supported.