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Object Description

Object Description. Figure Modelling. Mathematical Methods (Splines). Local Control Property. The Problem. A large amount of excellent work is carried out in the area of Computer Graphics BUT methods are not compatible. Description of objects. Surface - skin of the object.

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Object Description

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  1. Object Description

  2. Figure Modelling

  3. Mathematical Methods (Splines)

  4. Local Control Property

  5. The Problem A large amount of excellent work is carried out in the area of Computer Graphics BUT methods are not compatible

  6. Description of objects Surface - skin of the object

  7. Rectangular Patches

  8. Rectangular Patches • simple theory • the data structure is equivalent to a rectangular array • continuity is easy to handle • the two-variable problem is reduced to two single variable problems

  9. Unfortunately

  10. Standardising Surface Description #Vertices x1 y1 z1 x2 y2 z2 x3 y3 z3 x4 y4 z4 x5 y5 z5 x6 y6 z6 x7 y7 z7 x8 y8 z8 #Faces 1 2 4 3 5 6 8 7 1 2 6 5 3 4 8 7 1 3 7 5 2 4 8 6

  11. Non Rectangular Patches #Faces 1 2 3 4 5 6 7 8

  12. # Vertices vx1y1z1 vx2y2z2 v x3y3z3 vx4y4z4 v x5y5z5 vx6y6z6 # Faces f 1 2 4 3 f 5 6 8 7 f 1 2 6 5 # More Vertices v x7y7z7 vx8y8z8 # More Faces f 3 4 8 7 f 1 3 7 5 f 2 4 8 6 The Data-File

  13. The Data Structure float vertices[MAX_VERTICES][3]; int faces[MAX_FACES][MAX_VERTICES_IN_FACE + 1];

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