How are 3D models
constructed? Describe and explain the different modelling techniques available
to a 3D designer.
Remember that you are
trying to comprehensively explain the theory and applications of 3D with
elucidated examples and consistently using subject terminology correctly.
Polygonal Modelling - A polygon mesh is a bunch of vertices, edges and faces that portrays the shape of a polyhedral in 3D computer graphics and also solid modelling. Usually, the faces consist of triangles or quadrilaterals; or other simple convex polygons.
Although its possible to construct by manually specifying vertices and faces. In addition, it is more common to build meshes using many different tools. Also, a three dimensional software packages are available for use in constructing polygon meshes.
Primitive Modelling - Another common method of creating a polygonal mesh is by connecting together various primitives which are known as predefined polygonal meshes created by the modelling environment. Common primitives include
cubes
cylinders
spheres
pyramids
2D primitives such as discs and squares, triangles.
Box Modelling - a very popular way of constructing meshes is box modelling. Two simple tools are used in box modelling.
Firstly, is the subdivide tool. This tool splits faces and edges into smaller pieces by adding additional vertices. E.G. a square would be subdivided by adding 1 vertices in the center and one on each edge; creating 4 smaller squares.
Secondly, the extrude tool is applied to a face or a group of faces. This method creates a new face the exact same size and shape which is connected to the existing edges by a face. In addition, performing the extrude operation on a square a square face would create a cube in which would be connected to the surface at the location of the face.
Extrusion Modelling - A second common modelling method is sometimes referred to as inflation modelling. In this method, the user creates a 2D shape which basically traces the outline of an object from a photograph or drawing. Then the user will then use a second image of the object from a different angle and then extrude the 2D shape into 3D. Again in this process following the shape's outline. This method is especially more common for creating faces and heads. In contrast, the artist will model half of the head and then duplicate the vertices; invert their location relative to some plane and then finally connect the two pieces together. Overall, this will ensure that the model will now be symmetrical
.
Sketch Based Modelling - This is a user - friendly interface used for constructing low detailed models quickly.
3D Scanners - These can be used to create and develop high detail meshes based on actual real world objects. However, these devices are very expensive and are most commonly used by researches and industry professionals. Furthermore, these can generate high accuracy and sub - millimetric digital representations.
Polygonal Modelling - A polygon mesh is a bunch of vertices, edges and faces that portrays the shape of a polyhedral in 3D computer graphics and also solid modelling. Usually, the faces consist of triangles or quadrilaterals; or other simple convex polygons.
Although its possible to construct by manually specifying vertices and faces. In addition, it is more common to build meshes using many different tools. Also, a three dimensional software packages are available for use in constructing polygon meshes.
Primitive Modelling - Another common method of creating a polygonal mesh is by connecting together various primitives which are known as predefined polygonal meshes created by the modelling environment. Common primitives include
cubes
cylinders
spheres
pyramids
2D primitives such as discs and squares, triangles.
Box Modelling - a very popular way of constructing meshes is box modelling. Two simple tools are used in box modelling.
Firstly, is the subdivide tool. This tool splits faces and edges into smaller pieces by adding additional vertices. E.G. a square would be subdivided by adding 1 vertices in the center and one on each edge; creating 4 smaller squares.
Secondly, the extrude tool is applied to a face or a group of faces. This method creates a new face the exact same size and shape which is connected to the existing edges by a face. In addition, performing the extrude operation on a square a square face would create a cube in which would be connected to the surface at the location of the face.
Extrusion Modelling - A second common modelling method is sometimes referred to as inflation modelling. In this method, the user creates a 2D shape which basically traces the outline of an object from a photograph or drawing. Then the user will then use a second image of the object from a different angle and then extrude the 2D shape into 3D. Again in this process following the shape's outline. This method is especially more common for creating faces and heads. In contrast, the artist will model half of the head and then duplicate the vertices; invert their location relative to some plane and then finally connect the two pieces together. Overall, this will ensure that the model will now be symmetrical
.
Sketch Based Modelling - This is a user - friendly interface used for constructing low detailed models quickly.
3D Scanners - These can be used to create and develop high detail meshes based on actual real world objects. However, these devices are very expensive and are most commonly used by researches and industry professionals. Furthermore, these can generate high accuracy and sub - millimetric digital representations.
http://unit66chris.blogspot.co.uk/search/label/6.%20Constraints
http://www.tsplines.com/UserManual_files/image058.jpg
http://southerngfx.co.uk/wp-content/uploads/2010/11/primitives.png
http://www.youtube.com/watch?v=Fe2P7NNThXU
http://www.youtube.com/watch?v=xsJmTuDNx0w
http://www.youtube.com/watch?v=w9TWXI1xvbI
http://www.youtube.com/watch?v=SnB_GnoiCjU
http://www.youtube.com/watch?v=evSOIg4Fkuc
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