Open CASCADE Technology 7.5.0 released-卡核

Open Cascade is pleased to announce a new public release of Open CASCADE Technology (version 7.5.0).

Open CASCADE Technology version 7.5.0 is a minor release, which includes more than 400 improvements and corrections over the previous minor release 7.4.0.

Version 7.5.0 brings in new features of the most of OCCT modules and components. In particular, Draw Harness 3D Viewer allows to navigate through large real-size models including teleport-style navigation in VR view mode. Data Exchange functionality has been extended with glTF 2.0 writer support. New Visualization features include additional texture maps to improve visual quality, proper sRGB output rendering for correct semitransparent materials and gradients handling and PBR Metallic-Roughness material workflow to improve the quality of metallic presentations. Support of Unicode characters is completed by relevant improvements in STEP translator, DRAW console, message resources, and visualization. New samples demonstrating the usage of OCCT 3D Viewer built as WebAssembly within the browser and overview of the basic usage of C++ API of various OCCT functionalities have been introduced.

Aiming to make OCCT more user-friendly, documentation structure has been revised for easier navigation and understanding.

In particular, new «Contribution» section was created to ease the access to OCCT developer tools and encourage users to devote their time and expertise to contribute into OCCT source code development.

Soon you will see the renovated OCCT developer portal including extended contribution opportunities, more developer resources and wider forum threads coverage. Stay tuned!

New in OCCT 7.5.0:

General

Redesigned API of progress indicator for parallel tasks
Support of compilation for WebAssembly (with Emscripten SDK)
New printer Message_PrinterSystemLog for logging messages to system log

Modeling

Support of progress indicator in BRepMesh
New alternative algorithm for triangulation of 2d polygons
Tool to remove internal sub-shapes (with INTERNAL orientation) from the shape keeping topological connectivity
Allowed usage of multi-dimensional compound arguments for Boolean Cut and Common operations

Visualization

Use of sRGB textures and render buffer
PBR Metallic-roughness shading model
Normal map texture support
Option to compute BVH trees used for interactive selection in background thread
Support of special-style font families and multi-font .ttc files in Font Manager

Data Exchange

Support of reading STEP files containing non-Ascii symbols (Unicode or local code pages) in text strings
Support of writing Unicode text strings to STEP (as UTF-8)
New API for STEP reader accepting C++ stream on input
glTF 2.0 writer
Improved performance of (ASCII) STL and OBJ readers

Application Framework

Management of several documents (open, save, close, etc.) in parallel threads (one application per thread)
Inheritance of attributes to reuse their persistence mechanisms
Progress indicator in TDocStd_Application
Optimization of Commit operation for large modifications