HA4 Task 4 - Mesh Construction

How are 3D models constructed? Describe and explain the different modelling techniques available to a 3D designer.

Mesh Construction



Polygonal Construction
Polygonal Construction is using different shapes and meshes combined which generate an image.
using primitive shapes like cubes, squares, circles, torus' and triangles


http://www.cgmascot.com/blog/wp-content/uploads/posts/futureof3d_sculpt_wireframe.png

Primitive Shapes
The term used to class the simplest of geometric objects, also referred to as Geometric Primitive shapes
these can be;
2D;
Squares, Circles, Triangles
3D;
Cubes, Spheres, Pyramids, Torus'

http://thegreenhouseprojects.com/wp-content/uploads/2013/02/GUID-D70C18F6-1BA9-4ACB-8B50-39033A8E3417-low.png

http://www.webreference.com/3d/cararra/images/fig1_12.jpg


https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgn9yEm3sr4UkX8PCjsFAK-re66M2i2eRK9ROw1vNVkGSYpPQ9S26-huPLaxmod6sRE7WGMiFe5FlgUo1Qfjlt6nP2lO-S4P_Pp4SkJaGuldsJx6WQuwobzIYxq0ldRbNOiYaDabjoWIhLC/s1600/train10.jpg

Box Modeling
A 3D modeling technique using a primitive shape such as a cube and using a subdivide tool and a extrude tool to generate a rough draft to sculpt out the final project
Subdivision works by dividing up areas on the block and moving them accordingly to what they want.
Extrusion modeling. In this method, the user creates a 2d shape which traces the outline of an object from a photograph or a drawing. The user then uses a second image of the subject from a different angle and extrudes the 2d shape into 3d, again following the shape’s outline.

Subdivision

http://southerngfx.co.uk/wp-content/uploads/2010/11/3box.png

Extrusion

http://learningtonormalmap.files.wordpress.com/2011/03/screenshot019.jpg

3D Scanning
A 3D scanner scans a real-world object or Environment to collect data on its shape and colour
 the scanner is used to create a point cloud of geometric samples on the surface of the subject. These points can then be used to extrapolate the shape of the subject (a process called reconstruction). If color information is collected at each point, then the colors on the surface of the subject can also be determined.