chapter 5.pptx: drainage and irrigation engineering
fem model.ppt
1. What is geometric modeling?
• Collection of methods used to define the
shape and other geometric characteristics of
an object.
• To construct a precise mathematical
description of the shape of a real object or to
simulate some process.
• Embraces area – computational geometry
2. What is geometric modeling?
• special case of mathematical modeling
• the visual features are important.
• geometric model - physical object.
• non-geometric model – physical process e.g economic
3. Geometric data
• To make pictures/ design new things need a
computer representation of objects.
• Need to represent
– Shape
– Appearance (color, shininess etc)
– Material properties (density, stiffness etc)
4. • Geometric data representation
- Compute a mathematical approximation of the physical
shape of an object
• Algorithms for manipulating geometry
– Manipulate the variables defining the shape until we meet
the objective.
• Geometry creation
– Interactive.
– Automatic creation.
geometric modeling
5. Application
• Computer Aided Design/ engineering
(CAD/CAE)
• Entertainment
– Special effects
– Animation
– games
• Scientific visualization
• Education, information, advertising
6. CAD/CAE
• Stages
– Conceptual design
– Mechanical design
– Simulation
– Production
• Geometric data need to be shared
15. disediakan oleh Suriati bte Sadimon GMM,
FSKSM, UTM, 2004
Solid object construction method
• Sweeping
• Boolean
• Automated filleting and chambering
• Tweaking
– Face of an object is moved in some way