3,993 research outputs found
3D Shape Reconstruction from Sketches via Multi-view Convolutional Networks
We propose a method for reconstructing 3D shapes from 2D sketches in the form
of line drawings. Our method takes as input a single sketch, or multiple
sketches, and outputs a dense point cloud representing a 3D reconstruction of
the input sketch(es). The point cloud is then converted into a polygon mesh. At
the heart of our method lies a deep, encoder-decoder network. The encoder
converts the sketch into a compact representation encoding shape information.
The decoder converts this representation into depth and normal maps capturing
the underlying surface from several output viewpoints. The multi-view maps are
then consolidated into a 3D point cloud by solving an optimization problem that
fuses depth and normals across all viewpoints. Based on our experiments,
compared to other methods, such as volumetric networks, our architecture offers
several advantages, including more faithful reconstruction, higher output
surface resolution, better preservation of topology and shape structure.Comment: 3DV 2017 (oral
An approach for real world data modelling with the 3D terrestrial laser scanner for built environment
Capturing and modelling 3D information of the built environment is a big challenge. A number of techniques and technologies are now in use. These include EDM, GPS, and photogrammetric application, remote sensing and traditional building surveying applications. However, use of these technologies cannot be practical and efficient in regard to time, cost and accuracy. Furthermore, a multi disciplinary knowledge base, created from the studies and research about the regeneration aspects is fundamental: historical, architectural, archeologically, environmental, social, economic, etc. In order to have an adequate diagnosis of regeneration, it is necessary to describe buildings and surroundings by means of documentation and plans. However, at this point in time the foregoing is considerably far removed from the real situation, since more often than not it is extremely difficult to obtain full documentation and cartography, of an acceptable quality, since the material, constructive pathologies and systems are often insufficient or deficient (flat that simply reflects levels, isolated photographs,..). Sometimes the information in reality exists, but this fact is not known, or it is not easily accessible, leading to the unnecessary duplication of efforts and resources.
In this paper, we discussed 3D laser scanning technology, which can acquire high density point data in an accurate, fast way. Besides, the scanner can digitize all the 3D information concerned with a real world object such as buildings, trees and terrain down to millimetre detail Therefore, it can provide benefits for refurbishment process in regeneration in the Built Environment and it can be the potential solution to overcome the challenges above. The paper introduce an approach for scanning buildings, processing the point cloud raw data, and a modelling approach for CAD extraction and building objects classification by a pattern matching approach in IFC (Industry Foundation Classes) format. The approach presented in this paper from an undertaken research can lead to parametric design and Building Information Modelling (BIM) for existing structures. Two case studies are introduced to demonstrate the use of laser scanner technology in the Built Environment. These case studies are the Jactin House Building in East Manchester and the Peel building in the campus of University Salford. Through these case studies, while use of laser scanners are explained, the integration of it with various technologies and systems are also explored for professionals in Built Environmen
Integrating data from 3D CAD and 3D cameras for Real-Time Modeling
In a reversal of historic trends, the capital facilities industry is expressing an increasing desire for automation of equipment and construction processes. Simultaneously, the industry has become conscious that higher levels of interoperability are a key towards higher productivity and safer projects. In complex, dynamic, and rapidly changing three-dimensional (3D) environments such as facilities sites, cutting-edge 3D sensing technologies and processing algorithms are one area of development that can dramatically impact those projects factors. New 3D technologies are now being developed, with among them 3D camera. The main focus here is an investigation of the feasibility of rapidly combining and comparing – integrating – 3D sensed data (from a 3D camera) and 3D CAD data. Such a capability could improve construction quality assessment, facility aging assessment, as well as rapid environment reconstruction and construction automation. Some preliminary results are presented here. They deal with the challenge of fusing sensed and CAD data that are completely different in nature
AgustĂn de Betancourt’s Optical Telegraph: Geometric Modeling and Virtual Reconstruction
This article shows the geometric modeling and virtual reconstruction of the optical telegraph
by AgustĂn de Betancourt and Abraham Louis Breguet developed at the end of the 18th century.
Autodesk Inventor Professional software has been used to obtain the three-dimensional (3D) model
of this historical invention and its geometric documentation. The material for the research is available
on the website of the Betancourt Project of the Canary Orotava Foundation for the History of Science.
Thanks to the three-dimensional modeling performed, it has been possible to explain in detail both
its operation and the assembly system of this invention in a coherent way. After carrying out its 3D
modeling and functional analysis, it was discovered that the transmissions in the telegraph were not
performed by hemp ropes but rather by metal chains with flat links, considerably reducing possible
error. Similarly, it has also been found that the use of the gimbal joint facilitated the adaptability of the
invention to geographical areas where there was a physical impediment to the alignment of telegraph
stations. In addition, it was not now necessary for the telescope frames to be located parallel to the
mast frame (frame of the indicator arrow) and therefore they could work in different planes.This research was supported by the Spanish Ministry of Economic Affairs and Competitiveness under
the Spanish Plan of Scientific and Technical Research and Innovation (2013–2016), and the European Fund for Regional Development (EFRD) under grant number [HAR2015-63503-P]
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