07_3DObjectRepresentations(ch8)

07_3DObjectRepresentations(ch8) - 3D Object 3D Object...

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Unformatted text preview: 3D Object 3D Object Representations Representations Chapter 8 § Components for Image Synthesis § Scene description § Light source § Viewpoint § Scene = an assembly of one or more models § A model contains § A model contains § structural description - geometry of the shape § surface description - appearance (lighting) § For a simulation model we need more § physics § mechanics - assemblability * Some of contents from SigGraph Lecture Notes § How are models used? § Image synthesis § Design § Manufacturing - part relationships § Simulation § Art § Levels of Detail § Levels of Detail § visual detail vs. structural detail § more detail = more realism/accuracy = more resources § procedural objects : more detail when you need it. n Issues in Model Selection § Computational cost of the model § storage space § object construction time § display time § Effectiveness in modeling the desired phenomena § geometry § geometry – looks good for image-making – accuracy for simulation § appearance – looks – accuracy § Implementation Complexity § the number of primitives § the number of shapes § complexity of each instance § Ease of simulation § match to simulator § cost of conversion § Ease of animation § physics of motion § constraints n The difference between models and rendering § Models describe the object and its attributes: § shape or geometry § reflectivity, transmittance § surface smoothness, color § texture § Rendering algorithm transforms the models to a screen-based view from a given: § PRP , location, view direction, view up direction, projection type, window clipping plane, FOV angle § One or more light sources – location, direction, intensity, color § Atmospheric effects - ambient light, fog § Image quality parameters – antialiasing, resolution □ Operations on models ◦ Transformations ◦ Change of detail Interpolation to augment detail Averaging to reduce detail Hierarchy of models of the same object at different levels of detail different levels of detail ◦ Measurement topology - connectivity, feature distance volume surface tangent ◦ Combination union intersection difference cut/slice ◦ Deformation skew stretch bend perturb (e.g., randomly, stochastically, or fractally) ◦ Display operation wire-frame visible line/surface ray cast radiosity u Object representation models § Polygon, quadric surfaces § Simple Euclidean objects (polyhedrons, ellipsoids) § Spline surfaces § Designing aircraft wings, gears and other structures with...
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This note was uploaded on 04/29/2010 for the course CSE 4190.411 taught by Professor Shinyeonggil during the Fall '08 term at Seoul National.

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07_3DObjectRepresentations(ch8) - 3D Object 3D Object...

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