Modelling Techniques

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Modelling Techniques
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Message from the Dean

• Will Gwiji Mthetho (200300365) please see me
  after the lecture.

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Practical this week

• Colour and Light. Review Chapters 5 and 6.

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Hierarchical modelling
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Hierarchical modelling
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Hierarchical modelling
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Hierarchical modelling
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Hierarchical modelling
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Hierarchical modelling
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Hierarchical modelling
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Hierarchical modelling
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Hierarchical modelling
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Hierarchical modelling
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Parametric modelling

• bikeframe(sex, color, size)
• wheel(radius, hub width, hub radius, num spokes,
  tire, ...)
• axle(wheel1, wheel2, roll, yaw)
• Sphere(radius, center)
• Door(isopen)

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Parametric modelling
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Parametric modelling
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Parametric modelling
What would be some good parameters?
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Parametric modelling pros and cons

• Higher level of control.
• Multiple levels of control.
• More intuitive space.
• Must map parameters to geometry.
• Extra level of processing.

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Procedural Modelling

• Similar to parametric. Often used in conjunction.
• Geometry generated by a procedure, often with
  parameters.
• For instance, generating the spokes of a wheel by
  rotating in 10 degree increments or by rotating
  in 360/n degree increments

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Constructive Solid Geometry
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Constructive Solid Geometry

• Primitives, i.e. simple objects defined by known
  functions
• Operations, usually defined in terms of set
  operations.

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Primitives

• Sphere
• Cone
• Cylinder
• Torus
• Half-plane

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Operations

• Plus Union of two sets of points.
• Minus Difference between two sets of points.
• PaintMinus As for minus, but alters surface
  properties of remnant surface.

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Constructive Solid Geometry
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Constructive Solid Geometry
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Constructive Solid Geometry
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Constructive Solid Geometry
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Constructive Solid Geometry
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Making a CSG hammer
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Making a CSG hammer
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Making a CSG hammer
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Making a CSG hammer
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Making a CSG hammer
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Making a CSG hammer
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Making a CSG hammer
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Making a CSG hammer
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Making a CSG hammer
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CSG Operations
Logic Table Plus node
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CSG Operations
Logic Table Minus node
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Object intersections in CSG
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Object intersections in CSG
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Message from the Dean

• Will Gwiji Mthetho (200300365) please see me
  after the lecture.

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Next Lecture

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