The document discusses different methods for modeling solid objects in 3D, including constructive solid geometry (CSG) and boundary representation (B-Rep). CSG uses boolean operations on primitive solids, represented as a tree structure, while B-Rep defines solids by their enclosing faces, edges and vertices with topological connectivity. Both have advantages such as unambiguous definitions but also challenges around complexity, storage or modeling restrictions. Hybrid approaches combine benefits of both methods.
Introduction to CNC machine and Hardware. aman1312
Complete detailing of cnc machine and its operations with its required hardware necessary for increasing its Automation and increasing its manufacturing capability. Also increase in complex shape manufacturing.
What is process planning .Difficulties in traditional process planning,CAPP Model,Types of CAPP ,1.Retrieval type CAPP (variant) systems.
2.Generative CAPP systems.
3.Hybrid CAPP systems.
Process planning system , Machinability data systems , Benefits of CAPP
Introduction to CNC machine and Hardware. aman1312
Complete detailing of cnc machine and its operations with its required hardware necessary for increasing its Automation and increasing its manufacturing capability. Also increase in complex shape manufacturing.
What is process planning .Difficulties in traditional process planning,CAPP Model,Types of CAPP ,1.Retrieval type CAPP (variant) systems.
2.Generative CAPP systems.
3.Hybrid CAPP systems.
Process planning system , Machinability data systems , Benefits of CAPP
Event Management System Vb Net Project Report.pdfKamal Acharya
In present era, the scopes of information technology growing with a very fast .We do not see any are untouched from this industry. The scope of information technology has become wider includes: Business and industry. Household Business, Communication, Education, Entertainment, Science, Medicine, Engineering, Distance Learning, Weather Forecasting. Carrier Searching and so on.
My project named “Event Management System” is software that store and maintained all events coordinated in college. It also helpful to print related reports. My project will help to record the events coordinated by faculties with their Name, Event subject, date & details in an efficient & effective ways.
In my system we have to make a system by which a user can record all events coordinated by a particular faculty. In our proposed system some more featured are added which differs it from the existing system such as security.
NO1 Uk best vashikaran specialist in delhi vashikaran baba near me online vas...Amil Baba Dawood bangali
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Industrial Training at Shahjalal Fertilizer Company Limited (SFCL)MdTanvirMahtab2
This presentation is about the working procedure of Shahjalal Fertilizer Company Limited (SFCL). A Govt. owned Company of Bangladesh Chemical Industries Corporation under Ministry of Industries.
About
Indigenized remote control interface card suitable for MAFI system CCR equipment. Compatible for IDM8000 CCR. Backplane mounted serial and TCP/Ethernet communication module for CCR remote access. IDM 8000 CCR remote control on serial and TCP protocol.
• Remote control: Parallel or serial interface.
• Compatible with MAFI CCR system.
• Compatible with IDM8000 CCR.
• Compatible with Backplane mount serial communication.
• Compatible with commercial and Defence aviation CCR system.
• Remote control system for accessing CCR and allied system over serial or TCP.
• Indigenized local Support/presence in India.
• Easy in configuration using DIP switches.
Technical Specifications
Indigenized remote control interface card suitable for MAFI system CCR equipment. Compatible for IDM8000 CCR. Backplane mounted serial and TCP/Ethernet communication module for CCR remote access. IDM 8000 CCR remote control on serial and TCP protocol.
Key Features
Indigenized remote control interface card suitable for MAFI system CCR equipment. Compatible for IDM8000 CCR. Backplane mounted serial and TCP/Ethernet communication module for CCR remote access. IDM 8000 CCR remote control on serial and TCP protocol.
• Remote control: Parallel or serial interface
• Compatible with MAFI CCR system
• Copatiable with IDM8000 CCR
• Compatible with Backplane mount serial communication.
• Compatible with commercial and Defence aviation CCR system.
• Remote control system for accessing CCR and allied system over serial or TCP.
• Indigenized local Support/presence in India.
Application
• Remote control: Parallel or serial interface.
• Compatible with MAFI CCR system.
• Compatible with IDM8000 CCR.
• Compatible with Backplane mount serial communication.
• Compatible with commercial and Defence aviation CCR system.
• Remote control system for accessing CCR and allied system over serial or TCP.
• Indigenized local Support/presence in India.
• Easy in configuration using DIP switches.
COLLEGE BUS MANAGEMENT SYSTEM PROJECT REPORT.pdfKamal Acharya
The College Bus Management system is completely developed by Visual Basic .NET Version. The application is connect with most secured database language MS SQL Server. The application is develop by using best combination of front-end and back-end languages. The application is totally design like flat user interface. This flat user interface is more attractive user interface in 2017. The application is gives more important to the system functionality. The application is to manage the student’s details, driver’s details, bus details, bus route details, bus fees details and more. The application has only one unit for admin. The admin can manage the entire application. The admin can login into the application by using username and password of the admin. The application is develop for big and small colleges. It is more user friendly for non-computer person. Even they can easily learn how to manage the application within hours. The application is more secure by the admin. The system will give an effective output for the VB.Net and SQL Server given as input to the system. The compiled java program given as input to the system, after scanning the program will generate different reports. The application generates the report for users. The admin can view and download the report of the data. The application deliver the excel format reports. Because, excel formatted reports is very easy to understand the income and expense of the college bus. This application is mainly develop for windows operating system users. In 2017, 73% of people enterprises are using windows operating system. So the application will easily install for all the windows operating system users. The application-developed size is very low. The application consumes very low space in disk. Therefore, the user can allocate very minimum local disk space for this application.
Vaccine management system project report documentation..pdfKamal Acharya
The Division of Vaccine and Immunization is facing increasing difficulty monitoring vaccines and other commodities distribution once they have been distributed from the national stores. With the introduction of new vaccines, more challenges have been anticipated with this additions posing serious threat to the already over strained vaccine supply chain system in Kenya.
Welcome to WIPAC Monthly the magazine brought to you by the LinkedIn Group Water Industry Process Automation & Control.
In this month's edition, along with this month's industry news to celebrate the 13 years since the group was created we have articles including
A case study of the used of Advanced Process Control at the Wastewater Treatment works at Lleida in Spain
A look back on an article on smart wastewater networks in order to see how the industry has measured up in the interim around the adoption of Digital Transformation in the Water Industry.
Hybrid optimization of pumped hydro system and solar- Engr. Abdul-Azeez.pdffxintegritypublishin
Advancements in technology unveil a myriad of electrical and electronic breakthroughs geared towards efficiently harnessing limited resources to meet human energy demands. The optimization of hybrid solar PV panels and pumped hydro energy supply systems plays a pivotal role in utilizing natural resources effectively. This initiative not only benefits humanity but also fosters environmental sustainability. The study investigated the design optimization of these hybrid systems, focusing on understanding solar radiation patterns, identifying geographical influences on solar radiation, formulating a mathematical model for system optimization, and determining the optimal configuration of PV panels and pumped hydro storage. Through a comparative analysis approach and eight weeks of data collection, the study addressed key research questions related to solar radiation patterns and optimal system design. The findings highlighted regions with heightened solar radiation levels, showcasing substantial potential for power generation and emphasizing the system's efficiency. Optimizing system design significantly boosted power generation, promoted renewable energy utilization, and enhanced energy storage capacity. The study underscored the benefits of optimizing hybrid solar PV panels and pumped hydro energy supply systems for sustainable energy usage. Optimizing the design of solar PV panels and pumped hydro energy supply systems as examined across diverse climatic conditions in a developing country, not only enhances power generation but also improves the integration of renewable energy sources and boosts energy storage capacities, particularly beneficial for less economically prosperous regions. Additionally, the study provides valuable insights for advancing energy research in economically viable areas. Recommendations included conducting site-specific assessments, utilizing advanced modeling tools, implementing regular maintenance protocols, and enhancing communication among system components.
Saudi Arabia stands as a titan in the global energy landscape, renowned for its abundant oil and gas resources. It's the largest exporter of petroleum and holds some of the world's most significant reserves. Let's delve into the top 10 oil and gas projects shaping Saudi Arabia's energy future in 2024.
2. Why solid modeling?
• Recall weakness of wireframe and surface
modeling
– Ambiguous geometric description
– incomplete geometric description
– lack topological information
– Tedious modeling process
– Awkward user interface
3. Solid model
• Solid modeling is based on complete, valid
and unambiguous geometric representation
of physical object.
– Complete points in space can be classified.
(inside/ outside)
– Valid vertices, edges, faces are connected
properly.
– Unambiguous there can only be one
interpretation of object
5. Constructive solid geometry
(CSG)
• Objects are represented as a combination of
simpler solid objects (primitives).
• The primitives are such as cube, cylinder, cone,
torus, sphere etc.
• Copies or “instances” of these primitive shapes are
created and positioned.
• A complete solid model is constructed by
combining these “instances” using set specific,
logic operations (Boolean)
6. • Boolean operation
– each primitive solid is assumed to be a set of
points, a boolean operation is performed on
point sets and the result is a solid model.
– Boolean operation union, intersection and
difference
– The relative location and orientation of the two
primitives have to be defined before the
boolean operation can be performed.
– Boolean operation can be applied to two solids
other than the primitives.
Constructive solid geometry
(CSG)
7. • Union
– The sum of all points in each of two defined
sets. (logical “OR”)
– Also referred to as Add, Combine, Join, Merge
Constructive solid geometry
(CSG)- boolean operation
A ∪ B
A B
8. • Difference
– The points in a source set minus the points
common to a second set. (logical “NOT”)
– Set must share common volume
– Also referred to as subtraction, remove, cut
Constructive solid geometry
(CSG)- boolean operation
A - B
A B
9. • intersection
– Those points common to each of two defined
sets (logical “AND”)
– Set must share common volume
– Also referred to as common, conjoin
Constructive solid geometry
(CSG)- boolean operation
A ∩ B
A B
10. • When using boolean operation, be careful to
avoid situation that do not result in a valid
solid
Constructive solid geometry
(CSG)- boolean operation
A ∩ B
A B
11. • Boolean operation
– Are intuitive to user
– Are easy to use and understand
– Provide for the rapid manipulation of large
amounts of data.
• Because of this, many non-CSG systems
also use Boolean operations
Constructive solid geometry
(CSG)- boolean operation
12. • Data structure does not define model shape
explicitly but rather implies the geometric shape
through a procedural description
– E.g: object is not defined as a set of edges & faces but
by the instruction : union primitive1 with primitive 2
• This procedural data is stored in a data structure
referred to as a CSG tree
• The data structure is simple and stores compact
data easy to manage
Constructive solid geometry
(CSG)- data structure
13. • CSG tree stores the history of applying
boolean operations on the primitives.
– Stores in a binary tree format
– The outer leaf nodes of tree represent the
primitives
– The interior nodes represent the boolean
operations performed.
Constructive solid geometry
(CSG)- CSG tree
15. • More than one procedure (and hence database) can
be used to arrive at the same geometry.
Constructive solid geometry
(CSG)- not unique
∪
-
16. • CSG representation is unevaluated
– Faces, edges, vertices not defined in explicit
• CSG model are always valid
– Since built from solid elements.
• CSG models are complete and
unambiguous
Constructive solid geometry
(CSG) representation
17. • CSG is powerful with high level command.
• Easy to construct a solid model – minimum
step.
• CSG modeling techniques lead to a concise
database less storage.
– Complete history of model is retained and can
be altered at any point.
• Can be converted to the corresponding
boundary representation.
Constructive solid geometry
(CSG) - advantage
18. • Only boolean operations are allowed in the
modeling process with boolean operation
alone, the range of shapes to be modeled is
severely restricted not possible to construct
unusual shape.
• Requires a great deal of computation to derive the
information on the boundary, faces and edges
which is important for the interactive display/
manipulation of solid.
Constructive solid geometry
(CSG) - disadvantage
19. solution
• CSG representation tends to accompany the
corresponding boundary representation
hybrid representation
• Maintaining consistency between the two
representations is very important.
20. Boundary representation (B-Rep)
• Solid model is defined by their enclosing
surfaces or boundaries. This technique
consists of the geometric information about
the faces, edges and vertices of an object
with the topological data on how these are
connected.
21. Boundary representation (B-Rep)
• Why B-Rep includes such topological
information?
- A solid is represented as a closed space in
3D space (surface connect without gaps)
- The boundary of a solid separates points
inside from points outside solid.
22. B-Rep vs surface modeling
• Surface model
– A collection of surface entities which simply
enclose a volume lacks the connective data to
define a solid (i.e topology).
• B- Rep model
– Technique guarantees that surfaces definitively
divide model space into solid and void, even
after model modification commands.
23. B-Rep data structure
• B-Rep graph store face, edge and vertices
as nodes, with pointers, or branches
between the nodes to indicate connectivity.
25. Boundary representation- validity
• System must validate topology of created
solid.
• B-Rep has to fulfill certain conditions to
disallow self-intersecting and open objects
• This condition include
– Each edge should adjoin exactly two faces and
have a vertex at each end.
– Vertices are geometrically described by point
coordinates
26. Boundary representation- validity
• This condition include (cont)
– At least three edges must meet at each vertex.
– Faces are described by surface equations
– The set of faces forms a complete skin of the solid
with no missing parts.
– Each face is bordered by an ordered set of edges
forming a closed loop.
– Faces must only intersect at common edges or
vertices.
– The boundaries of faces do not intersect themselves
27. • Validity also checked through mathematical
evaluation
– Evaluation is based upon Euler’s Law (valid for
simple polyhedra – no hole)
– V – E + F = 2 V-vertices E- edges F- face loops
Boundary representation- validity
f1
f2f3
f4 f5
E1
E2
E3
E4
E5
E6
E7
E8
v2
v3v4
v5 V = 5, E = 8, F = 5
5 – 8 + 5 = 2
v1
28. • Expanded Euler’s law for complex polyhedrons
(with holes)
• Euler-Poincare Law:
– V-E+F-H=2(B-P)
– H – number of holes in face, P- number of passages or through
holes, B- number of separate bodies.
Boundary representation- validity
V = 24, E=36, F=15, H=3,
P=1,B=1
29. • Valid B-Reps are unambiguos
• Not fully unique, but much more so than
CSG
• Potential difference exists in division of
– Surfaces into faces.
– Curves into edges
Boundary representation-
ambiguity and uniqueness
30. • Capability to construct unusual shapes that
would not be possible with the available
CSG aircraft fuselages, swing shapes
• Less computational time to reconstruct the
image
Boundary representation-
advantages
31. • Requires more storage
• More prone to validity failure than CSG
• Model display limited to planar faces and
linear edges
- complex curve and surfaces only approximated
Boundary representation-
disadvantages
32. Solid object construction method
• Sweeping
• Boolean
• Automated filleting and chambering
• Tweaking
– Face of an object is moved in some way