Modeling 3D Digital City

How Yogya Virtual City which embedded with its collective memory will be modeled ?

The success of a VR model depends on the balance point between the speed, detail and sense of presence (Chan & Weng, 2005)
- Architectural and Urban Data Collection
- Digital Model Creation
- PC file to VR conversion and evaluation

Characteristics of Urban Models (Day, 2005)
- Accuracy : geometrical precision to which the model has been constructed and is determined by the surveying methods employed (is it accurate or approximate ?)
- Realism : a measure of how convincing the model looks and depends on the level of detail and the way in which the colours, textures and lighting have been applied (is it realistic or abstract?)
- Interactivity : Refers to the ease with which one can move through and manipulate a model. This is affected by its size and complexity and by the way in which it has been treated in terms of colour, texture and lighting (is it interactive or static ?)

Several Methods of developing a digital city (Chan, 2005)
- complete a large scale of physical model, then apply a 3D scanner to convert the scanning result into digital model (Blundell, Williams and Lintonbon, 1999).
- apply photorealistic imaging techniques to photograph the buildings and convert them to digital models for the city of London.
- apply laser scanner to scan urban platform for land exploration.
- apply maps, architectural floor plan drawings, elevation drawings, aerial photos, and street photos as reference for generating computer models in 3D modeling system.

Level of Usage of 3D Cities

The level of usage of VR Cities determined the delivery method and the method of visualization used across the network/internet (Andrew Hudson Smith, et.al, 2005)
- Fully professional usage, delicate data to be distributed and queried via 3D model with users requiring password and username to view resctricted level of data.
- Concerned citizen usage/public participation, would be both educational and participatory. It links to the development of e-democracy and evaluation of 'what if' scenarios to enable digital planning at the citizen scale.
- Virtual Tourism, it is a side product of the development for digital planning --> can be used to navigate, view scenes and pick up websites --> model can be used for marketing purposes.
- Educational Usage, education visualization would be through a multi-user collaborative system --> students would be able to load in their own models in closed sections of the networked site for visualization and evaluation of design.