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| − | == '''Part 1: project profile''' ==
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| − | === Project name ===
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| − | A vision-based 3D input device for space curve
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| − | === Project short description ===
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| − | This project is aimed at designing a tangible input device for the reconstruction of a space curve in a 3D modeling software. The idea behind this project is to create a system in where users can physically manipulate a flexible wire for obtain a desired shape in a 3D modeling software. In particular the developed software is able to release a photo of the tube using a camera connected remotely, and, starting from that single image, it can find the 3D shape of the curve. After the reconstruction, the curve is automatically imported in a 3D modeling software and it's mathematically elaborated for being easily usable.
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| − | === Dates ===
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| − | Start date: 2007/09/20
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| − | End date: ongoing
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| − | === People involved ===
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| − | ===== Project head =====
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| − | Alessandro Giusti- [[User:AlessandroGiusti]]
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| − | ===== Students currently working on the project =====
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| − | Lorenzo Mureddu- [[User:LorenzoMureddu]] as a project for course Laboratorio Software, prof.ssa Bolchini
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| − | ===== Students who worked on the project in the past =====
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| − | == '''Part 2: project description''' ==
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| − | ==== Introduction ====
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| − | Human-computer Interaction is a serious problem regarding the 3D modeling.
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| − | There are a lot of instruments for work in 3D space, but no-one of them has become the stardard due to difficulties in the interaction with a 6DOF (Degree of Freedom) world.
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| − | During this project we want to produce a system for an user friendly input device of a 3D curve.
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| − | The goal is to digitize a space curve whose shape is physically defined by the user.
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| − | The manipulable support adopted allows the user to define the 3D shape with his own hands, having a real object as an instrument, unlike what happens with devices requiring the user to draw a trajectory (with some visible marker) in the space.
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| − | The system is composed by a piece of flexible, circularsection wire, which the user bends to the desired shape, and a digital camera.
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| − | The photo of the bent wire is used to reconstruct its shape, which is the output of our system.
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| − | Although counter-intuitive, single-image 3D reconstruction of the wire shape is possible by using its tube-like geometry (called canal surface) and its perspective effects.
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| − | ==== The system at work ====
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| − | Our system can be resumed in a few passages.
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| − | First-of-all the software automatically release a photo to the manipulated wire using the camera connected remotely.
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| − | On a second phase, our software reconstruct the shape of the curve in form of spline using an
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| − | ad-hoc alghoritm written, by now, in Matlab. In this phase the spline is modified according to some values chosen by the user: 3 coordinates to define the initial point of the curve and 3 angles to define the direction.
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| − | In third place the spline is imported and visualized in Blender (a famous 3d modelng software) as a Bézier curve. The curve that we obtain can be view as a line or as a tube, according with users needs.
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| − | <gallery>
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| − | image:sistema.jpg|instrument and setting
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| − | image:sistema2.jpg|source photo
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| − | image:sistema3.jpg|reconstruction
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| − | </gallery>
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| − | At this point our software offer another feature: it can easily build complex structures formed by many curves. Users have to choose first which point of a curve should be used for the beginning of another one, and secondly 3 angles to define how the curves should be directed by each other.
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| − | [[image:multitubi.jpg|100px|a multi-tube structure|thumb|center]]
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| − | ==== Use of our System====
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| − | Well, now we have a curve in a 3d modeling software, but what can we do with this?
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| − | There are really a lot of possible use of a 3D curve. For example users can use it simply for delineate a tube in a 3D scene.
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| − | Otherwise a curve can be used to make a path that an object can follow, included the virtual camera.
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| − | Finally users can use a curve to deform an object, so to create a complex object with the shape of the curve obtained thank to our software.
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