Application of 3D visualization in Urban Planning)

Application of 3D visualization in Urban Planning 1) Significance of 3D technology in Urban Planning

With its powerful functions and wide application, 3D visualization has transformed urban planning and architectural design forms from traditional, sand table models, and 3D animation design patterns to digital technology developments. [40] ]. More importantly, it implements scientific simulation, simulation, and Prediction of the changing status and trends of the urban environment from the past to the future. The use of urban space data to establish a realistic, three-dimensional, interactive virtual city environment can achieve comprehensive and automated design concepts of urban planning; in addition, the virtual city landscape built using 3D visualization technology can be selected from a large number of planning schemes with the best benefits. As urban planning plays an important role in the sustainable development of the national economy, 3D visualization will have a very broad application prospect in various urban-related planning projects [41].

The significance of 3D City Visualization in urban planning is mainly reflected in the following aspects:

(1) improves the efficiency of solution design and correction, and avoids planning and design and management risks.

Using a 3D simulation system, we can easily adjust the solution, which greatly accelerates the speed and quality of the solution design. It is a reproduction and reflection of the digital space of a material city, the 3D virtual environment is a combination of digital models based on real data. It establishes realistic 3D scenarios in strict accordance with the standards and requirements of engineering project design, reproduce the planned project ". In a virtual city, we can not only see the current situation of the city, but also see the past and future of the city and even the whole process of city development [42]. In 3D scenarios, users can freely roam human-computer interaction, and many imperceptible design defects can be easily discovered, reducing irreparable losses and regrets caused by incomplete planning, it avoids planning, design, and management risks and greatly improves the overall quality of urban planning and management.

 

(2) Enrich the research angle of urban problems

When a 3D simulation system is used to study different city problems, various specific functions make the information we obtain richer and more comprehensive, this helps us make more scientific and objective judgments. At the same time, because the 3D simulation system can "reproduce" the planning project in real time, many design problems that are hard to detect can be easily discovered, the loss and regret caused by incomplete planning are greatly reduced.

(3) improved the quality of project evaluation

Some traditional forms of representation, such as models, are easily artificially modified in terms of spacing, height, illumination, and materials to mislead evaluators, this allows you to make judgments and decisions in favor of one party. If the Urban Construction Department establishes a Standard Virtual Reality System Platform [43], the development institutions or design units are required to directly import their solutions to the same precision, size ratio and visual quality, the scheme evaluation will be more accurate and fair.

(4) improved project management capabilities and efficiency

A complete set of planning and management virtual reality systems. If you need to add new projects or modify projects, you can import or update system data at any time for future archiving, this not only greatly facilitates the management of planning and management departments, but also improves efficiency and saves costs.

(5) improve public participation and enhance the effect of planning publicity

For large-scale urban planning projects of public interest, during the design of the planning project scheme, 3D visualization can export the existing planning scheme to interactive visualization 3D files, it is used to make multimedia materials for publicity to a certain extent, so that the public can truly participate in the planning project and increase the degree of public participation. After the final planning project scheme is determined, you can also produce multimedia videos to further improve the publicity and Display Effect of the urban planning project.

2) application of 3D technology in the presentation of urban planning results (1) Static Rendering

The procedure of creating a static rendering map on the computer is: first, create a three-dimensional geometric model of the object, and then set the material texture of the model surface and the lighting and lighting in the scenario, then select a proper viewing angle, rendering a single static image by a computer and displaying it on a computer screen or printing it on paper. The software for displaying and printing is relatively simple, it can be independent from the rendering software [44].

(2) fixed-path Animation

A static rendering map is suitable for expressing one or more building units. When there are many buildings, you can only select the desired angle to see the panorama. For urban landscapes with a large number of buildings, complex spatial shapes, and a large range, or complex indoor landscapes, Multiple Static rendering images often fail to fully display objects and landscapes of interest to people, to this end, many static rendering images are connected in series and played continuously on the display screen, which forms a computer animation, giving people the feeling of watching movies and videos, not only watching the movements in the scene, objects in a scenario can also be moved.

(3) interactive and dynamic landscape Simulation

The complex architecture and urban space landscape cannot be fully expressed by several animations and several observation paths. Real-time dynamic landscape simulation is another step ahead of the animation. The so-called real-time dynamic means that the computer can immediately generate a rendering Image Based on the position and perspective selected by the observer [45]. Because the freedom of the observer is higher than that of the animation, more objects need to be input into the computer, and less things can be omitted in static rendering and animation, this not only greatly increases the workload of building 3D geometric models of objects, but also increases the volume of graphics data and the computing workload of computers in a geometric level.

(4) Complicated Immersive Virtual Reality

In the aforementioned dynamic interactive simulation, the adjustment of the person's observation position, angle, and direction relies on the mouse, which is implemented with a simple joystick. In order to further improve the interaction between the observer and the landscape, there can also be multiple ways to control observation.