model - Modeling Chapter 8 Intro. to Computer Graphics...

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Unformatted text preview: Modeling Chapter 8 Intro. to Computer Graphics Spring 2009, Y. G. Shin Components for Image Synthesis Scene description Light source Viewpoint Scene = an assembly of one or more models A model contains structural description - geometry of the shape surface description - appearance (lighting) For a simulation model we need more physics mechanics - assemblability, reachability * Some of contents from SigGraph Lecture Notes How are models used? Image synthesis Design Manufacturing - part relationships, feasibility Simulation Art Levels of Detail visual detail vs. structural detail more detail = more realism/accuracy = more resources procedural objects : more detail when you need it. Issues in Model Selection Computational cost of the model storage space object construction time display time Effectiveness in modeling the desired phenomena 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 The methods need to acquire (or create) data Ease of simulation match to simulator cost of conversion Ease of animation physics of motion constraints 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 model to a screen-based view from a given: COP or camera position, location, view direction, view up direction projection type, window clipping plane, focal length One or more light sources – location, direction, intensity, color Atmospheric effects - ambient light, fog, depth cuing Image quality parameters – antialiasing, resolution □...
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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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model - Modeling Chapter 8 Intro. to Computer Graphics...

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