Changes for page PLY

Last modified by Kashif Iqbal on 2019/03/05 16:53

From version < 4.1 >
edited by kashifiqbal
on 2018/11/16 14:23
To version < 5.1 >
edited by Kashif Iqbal
on 2019/03/05 16:52
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1 += What is a PLY file? =
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1 1  PLY, Polygon File Format, represents 3D file format that stores graphical objects described as a collection of polygons. The purpose of this file format was to establish a simple and easy file type that is general enough to be useful for a wide range of models. PLY file format comes as ASCII as well as Binary format for compact storage and for rapid saving and loading. The file format is used by different applications that provide support for 3D files reading.
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3 3  Objects in a PLY format are described by a collection of vertices, faces and other elements, along with properties such as colour and normal direction that can be attached to these elements. Other properties that can also be stored with the object include:
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11 11  An object represented by PLY format can be the result of various sources such as hand-digitized objects, polygon objects from modelling applications, range data, triangles from marching cubes, terain data and radiosity models.
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14 14  == Brief History ==
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16 16  The PLY format was developed in in 1990's by Greg Turk and others in the Stanford graphics lab and that is why it is also known as Stanford Triangle Format. The file format has version 1.0 since then and no further modifications were done.
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18 -== File Format ==
19 +== PLY File Format ==
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20 20  A simple PLY object consists of collection of elements for representation of the object. It consists of a list of (x,y,z) triples of a vertices and a list of faces that are actually indices into the list of vertices. Vertices and faces are two examples of elements and majority of the PLY file consists of these two elements. New properties can also be created and attached to the elements of an object, but these should be added in such a way that old programs do not break when these new properties are encountered. Such properties can be discarded by reading applications as well. Moreover, new elements can be created and properties can be defined with this element  as well.
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