Development of NURBS Library for geometric modeling

Development and Implementation of various NURBS based algorithms in CAGD like creation, editing, conversion, and display of geometric data. Library has been developed using ANSI C on Linux platfrom.

3D Search engine for CAD models -DiscreteEngine

Project is focused on development of a 3D search engine which indexes the CAD models using FFT shape descriptor. The indexing is done by the crawler which converts all the CAD models into statistical form and stores it in repository. Shape descriptor converts the querying model in statistical form and compares it with available models in repository. Suitable CAD models are retrieved on comparison and displayed using OpenGL. Project supports DXF, VRML and STL file formats for querying and indexing.

CAD Surface creation by carpeting technique for engineering application

Project is focused on monolithic surface creation for engineering applications. There are various methods available for creating small surface patches as per engineers' requirements like stitching, fitting, fairing, cloud point etc. Currently methods available to create single monolithic surface are time consuming; they also have limitation and restriction in the type of input geometry provided.
Our method provides to create monolithic surface quickly and efficiently. At first, a surface of an approximate shape is created. This surface is then dropped or projected on the input geometry. In the next step, a surface smoothing or surface repair algorithm would edit output surface. This would eliminate manual operations required in the existing methods.
Work involved:

	Development of surface projection algorithm
	Development of geometric tool library for surface projection
	Surface smoothers to remove surface defects
	Development of spatial data structure to accelerate surface projection

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Development Of Algorithms For Shape Recognition Of Geometric Forms

Recognizing the construction methods of (piecewise) polynomial or rational curves and surfaces are of great importance, e.g., for geometrical data exchange between two different modeling systems. The project aims to find conditions that would determine geometric shape of object from set of input curves and surfaces. These conditions should be able to detect: (1) whether a curve segment is a line, a circle, a circular arc, an ellipse, an elliptic arc or  planar curve; (2) whether a surface patch is a plane, a sphere, a cylinder or a cone; and (3) whether a surface is constructed as a surface of revolution, extrusion, a ruled/developed surface or a generalized cylinder. The detected geometric features will be added to CAD system using their native CAD API. This would be achieved by choosing appropriate model parameters and creation method. Input is received in the form of IGES or DXF files. Thereby comprehensive IGES Reader and DXF Reader programs are developed to process input geometric model. This software module is being developed on a Linux platform using ANSI C, OpenGL.

Graphics Interface Development in HOOPS 3D for CAD application

Project involves understanding of HOOPS 3D and implementing its Graphic Capabilities in a prototype CAD Application Software

Graphics Interface development in OpenGL for CAD application

Development of GUI for CAD application using OpenGL It would display complex geometries of surface and solid modeling using advance OpenGL APIs. It includes displaying tessellated and NURBS data which is useful in CAD application. GUI also includes advance functionalities like rendering, lighting and hidden lines to have a realistic view of CAD models. QT would be used to manage menu, toolbars and command buttons. It was developed using ANSI C, OpenGL and QT on Linux platform