HOOPS 3D Application Framework

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HOOPS v18 Technical Overview

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HOOPS 란?

HOOPS 3D Application Framework

3D와 2D 응용 프로그램 개발을 위한 라이브러리로 구성됨

지원되는 플랫폼OpenGL과 DirectX, 32bit/64bit, C/C++, C#, .NET, JavaMS Windows, Apple OSX, Linux, UnixWin32, MFC, .NET Framework, WPF, ActiveX, X11 and QT, Java SWING and SWT

1) HOOPS/3dGS (3D Graphic System)는 코어 지오메트릭 데이터베이스, 씬그래프, 드라이버관리 시스템으로 이루어져 있다.

2) HOOPS/MVO (Model View Operator) 라이브러리는하이레벨 애플리케이션 레이어로써 GUI 이벤트를HOOPS/3dAF와 매핑하여준다.


HOOPS Scenegraph

A scenegraph is a directed-graph or tree that describes a 2D or 3D scene, usually in a hierarchical manner. In HOOPS the nodes of the scenegraph are termed ‘segments’. The geometries associated with each segment are termed ‘entities’ and the information describing how each segment should be displayed are termed ‘attributes’.


The Shell Entity

• For 3D systems the primary geometric entity that will be used is the HOOPS shell. The structure is common within computer graphics and is often termed „indexed face set‟ or „polygon-point mesh‟.

• A shell defines the boundary surface of an object in 3D using a set of planar polygons. Polygons can be multi-sided and can include holes. For reasons of compactness and performance the shell is defined as a array of vertices (3d points) and an array of indices into the vertex array that define each polygon („face‟). As polygons are multi-side each face definition starts with the number of vertices in that face.

• HOOPS supports much advanced functionality relating to shells including the ability to select, highlight and modify individual sub-entities i.e. faces, edges and vertices. Additionally attributes can be set per sub-entity including normals, colours and texture coordinates to enable a variety of complex shading and display.


Line and Text


Drivers

3D Drivers

• DirectX Driver

• OpenGL Driver

• OpenGL2 Driver

Print and 2D Drivers

• CGM3 Driver

• HPGL2 Driver

• Image Driver

• MSW Driver

• PDF Driver

• Postscript

• Qt driver

• Quartz Driver

• X11 driver

• WHIP Driver


다양한 셀렉션 컨트롤

Edge selection (left), vertex selection (centre) and face selection (right)


다양한 하이라이트 방법

• Standard override • Conditional highlighting• Quickmoves highlighting • Inverse Transparency highlighting • Dynamic highlighting


예) Inverse Transparency highlighting


레벨에 따른 투명도 조정

Depth peeling transparency: one layer (left), two layers (middle) and three layers (right)


Bounded Section Planes

Both OpenGL and DirectX supply support for hardware-based section (“cut”) planes so that the model can be sectioned so the interior can be viewed.


A bounded 3-sided section


Point Clouds – Dynamic level of detail


Advanced geometry utilities


Shaders

Jaw model with multi-layer transparency and ambient occlusion


HOOPS Visual quality

HOOPS Gouraud shading (left) and Phong shading (right)


Color interpolation for display of analysis results

Section of an engine block showing mesh edges (top left), colour interpolation (top right), colourindex interpolation (bottom left) and blended index interpolation (bottom right)


Isolines and contour lines

Isolines calculated from values on an engine block mesh.


Advanced Hidden Line

Hybrid rendering of hidden line, transparency and shadows

Fake hidden line with silhouette edges and ambient occlusion


Texture


Texture

A structural steel model with normal lighting (left) and enhanced silhouette edges (right)


Real time Shadow

Real time shadows on a turbine model


Ambient Occlusion

An architectural interior with flat lighting (top), ambient occlusion (middle) and real-time shadows (bottom)


Bloom

Radial bloom (left) and Star bloom (right)


Depth of field

Depth of field applied to a cityscape.


Gooch Shading

A Formula 1 car with normal shading (left) and cartoon-style Gooch shading (right)


Hemispheric Ambient Lighting

Scene with textures and ambient occlusion (left), interactive shadows and hemispheric lighting (right)


Reflection Planes

A car model using ambient occlusion, real-time shadows, silhouette edges, bloom a reflection plane.


HOOPS/MVO OPERATORS

Advanced Feature


네비게이션

Camera Orbit, Camera Pan and Camera Zoom Turn Table Orbit RelativeZoom Box Manipulate WalkLook Up/Down

o DOOM Style Keyboard control or flight-style mouse control o Gravity and Collision detection o Walk speed controllable relative to bounds of scene


셀렉션 컨트롤

Area select (left), polyline select (middle) and polygon select (right)


인터랙티브 엔티티 생성

Circles, cones, cuboids, cylinders, NURBS curves and surfaces, polylines, rectangles, spheres and cut/section planes.


Annotation and Markup

HOOPS-Based Annotations in Solidworks eDrawings


Animation

Animation of landing gear showing changes in stress on a strut.


Animation

Animation of interpolated values in an engine block


Graph, Charts and Plots

An interactive plot of four hundred thousand points using HOOPS


Manipulator handles


Interactive Scene Widgets


Clash DetectionHOOPS offers a range of utilities to support advanced clash and collision detection. These include • Detecting collisions with the camera during interactive walkthroughs - so the viewer cannot walk through walls for example • Sweep-based dynamic collision detection for simulation of moving objects e.g. robotic workcells, CMM probes, multi-axis machine tools and fixtures, material flow through factories. • Static clash detection for identifying design errors in large capital projects with multiple suppliers e.g. construction, plant and shipbuilding projects. • Point-based clash detection for adding new geometry to laser-scans of existing environments

HOOPS collision detection is based on polygonal and point geometry and is heavily optimised for performance. A spatial hierarchy is created so that individual triangles and points are spatially localisedso that expensive triangle-triangle or triangle-point intersection calculations are minimised. Both hard (intersecting) and soft (touching) clashes can be identified, and nearest distance calculations are available to determine whether non-intersecting geometry lies within a specified tolerance – for example electric cabling that has been placed too near a hot pipe. Clash detection in HOOPS is provided in several layers. The core geometry functions are available in the HOOPS/3dGS library and can be used to rapidly develop a custom clash or collision framework to a custom specification. Additionally HOOPS/MVO provides an extra framework for static clash detection that includes an example MFC-based user interface in the HOOPS Partviewer demonstration application.


Clash Detection

The sample interface includes options for controlling calculation and results, selecting which parts of the model tree to compare with which other parts, a variety of highlight modes and the ability to identify each clashing object in the model tree.


HOOPS Streaming Format (HSF)

The HOOPS Stream Format is an open, extendible, highly-compressed and streamable file format designed for lightweight communication of graphical and geometrical information. Reading and writing HSF is supported by the HOOPS Stream libraries. • Open: Membership of the OpenHSF initiative allows companies to read and write the HSF format. The specification for HSF is published at www.openhsf.org. For example, both Dassault SystemesCatia v5 and Solidworks products export directly to HSF. • Extendible: HSF and the supporting read/write libraries, is token-based. Tokens to support all HOOPS primitives and entities are pre-defined. Application developers can add their own tokens to extend the format. When read into HOOPS using standard code tokens that have not been recognised are simply ignored. • Highly-Compressed: HSF supports both lossless LZ compression and advanced edge-breaking algorithms. Lossy compression allows vertices and normals to be written in a compressed format that is significantly smaller than standard floating point • Streamable: HSF supports o object revisiting – objects can be tagged to be revisited later in the import or export o piecemeal reading and writing - user-specified chunks of data can be read or written o data dictionary – the scenegraph can be written first followed by the geometry allowing the structure of the file to be quickly read in and then the required nodes to be read first o automatic object prioritisation – shell primitives can be prioritised based on their size and vertex density

The HOOPS Stream Format has been adopted by a number of major Mechanical CAD vendors as the basis for their proprietary lightweight file formats.


HOOPS/HIO Module

In HOOPS 18 the following HIO modules are available: • Autodesk DWG, based on Autodesk RealDWG libraries • Adobe PRC, based on Adobe Acrobat Pro Extended • Bentley DGN, based on the Open Design Alliance DGN libraries o A DGN to HSF exporter plugin to Microstation is also provided as standard to HOOPS

• Autodesk DWF, based on the Autodesk DWF Toolkit • U3D, based on Intel’s U3D libraries • Google Sketchup, based on the Google Sketchup SDK.

HIO stands for HOOPS Input/Output. The HIO modules are based around a plug-in architecture to HOOPS/MVO. At runtime, if the appropriate DLLs are available then HOOPS/MVO will automatically extend the input and output options from HOOPS to include that file format.


HOOPS 3D EXCHANGE

3D 모델 파일변환 모듈 (별도 라이선싱 필요)


HOOPS 3D Exchange

• 임포터– CATIA V4, V5– SolidWorks– CGR

– NX– JTOpen– Parasolid(XT)

– Pro/Engineer

– PRC

– Inventor

– IGES– IFC (Industrial Foundation Classes)– STEP– STL(Stereo Lithography)– U3D(Universal 3D)

• 퍼블리셔– IGES– Parasolid(XT)– PC– STEP– STL(Stereo Lithography)– U3D(Universal 3D)

• 3D PDF SDK

• SolidEdge 임포터• I-DEAS 임포터

HOOPS 3D Exchange (3DX 3.0 beta)는 Windows 7, Vista, XP (32 , 64 bit) 플랫폼을 지원합니다.


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HOOPS 3D Application Framework