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3D Modeling is the creation, manipulation, and storage of geometric objects to represent objects that are all around us or virtual objects. The process begins with the use of specialized 3d software. The 3D artist develops a mathematical, wireframe representation of the object using specialized software. The final product is called a 3D model.

The 3d modeling process for 3D computer graphics is similar to sculpting. During this process geometric data is manipulated and prepared manually or automatically. There are three methods for creating and representing a 3d model. They are: polygonal, NURBS, and Splines and Patched.

Polygonal uses vertices that are connected to form a polygonal mesh. Because they are polygonal, curved surfaces are approximated by using many small flat surfaces. The vast majority of 3D models today are built as textured polygonal models, because they are the most flexible and quickest for the computer to handle. Polygonal 3d models can be categorized as high polygonal and low polygonal models depending on the density of the polygonal mesh. Low poly 3d models are preferred for 3d games and simulations as they tend to require less computing power.

NURBS 3d modeling uses NURBS surfaces. NURBS are truly smooth surfaces, not approximations using small flat surfaces, like polygonal. They are best suited for complex forms and organic modeling. NURBS surfaces are defined geometrically by spline curves, which in turn are influenced by weighted control points. The curve follows these weight control points, so increasing the weight of a point will pull the curve closer to that point and vice-versa.

Splines and Patches 3D modeling depend on curved lines to define the visible surface. When using this method the 3d modeling stage consists of shaping individual objects that are later used in the scene. There are a number of techniques including: constructive solid geometry, implicit surfaces, and subdivision surfaces.

Modeling can be performed by means of a dedicated 3d software program or an application component or some scene description language. In some cases, there is no strict distinction between these phases; in such cases modeling is just part of the scene creation process.

Complex materials are modeled using particle systems. A Particle system is a mass of 3D coordinates which have points, polygons, texture splats, or sprites assigned to them. Materials that are modeled using particle systems include smoke, blowing sand, clouds, and liquid sprays.

Once the 3d model is done, the 3D artist may begin the process of 3D rendering for visual representation in 2D or use the 3d model for an animation. Also, the 3D model can be used for other applications including computer simulation of physical phenomena. The 3d model can also be physically created using 3D printing via rapid prototyping techniques. When 3d printing is used, the 3d object is created connecting layers of cross sections of material.

Flat Pyramid
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The very first skateboards were invented in the late 1940s. Back then many kids ran around on scooters, but these were expensive and although popular not all kids could afford them. Some of those kids who could not afford scooters simply destroyed their rollerskates and nailed the wheels onto pieces of wood. They also nailed a piece of wood to the front of this which was used as a handle. I guess most of these kids were not excellent carpenters and these handles probably fell off pretty quickly, thus many kids end up riding around on just the wood and wheels.

Surfers took up skating when there were no waves to surf on, and as a result of this commercially made skateboards became available in the 1950s.

Skateboarding is now one of the fastest growing sports in the world. Competitions are held on a regular basis in almost all countries, and attract hundreds of both amateur and professional competitors. These competitions are generally held in custom-built skate parks which can now be found in most major towns and cities. As a result of this increase in popularity special shoes and clothing have been made solely for skateboarders.

There are basically two different types of skating, street skating and ramp skating.
Street skating, obviously is carried out on the streets, but can also be carried out pretty much anywhere where the surface is flat and smooth, such as car parks and schools.

Skate parks are custom-built for all the different types of skating. The services are all smoothed, generally made from concrete or wood. They are filled with various types of obstacles that the skaters can use tricks, grinds, and flips.

An extreme form of street skating is called skateboard racing. This involves riders racing each other down winding and often extremely steep roads. This can be extremely dangerous at speeds of over 65 km an hour have been reached.

The two most popular forms of ramp skating, are on vert ramps, or mini ramps. There are also quarter pipes and other shaped ramps. Vert ramps are generally about three to 4 m high and have a section of vertical transition at either end. Only experienced skaters should attempt to ride one of these. Mini ramps are obviously much smaller and are easier to ride on, and this is where many skaters learn to ride before moving on.

Skateboarding can be a dangerous sport, however if you follow these simple rules you will keep yourself and others safe:

1) always learn your basic moves on flat and safe ground
2) keep in control of a skateboard at all times
3) always wear a helmet, wrist guards, and knee and elbow pads
4) never skate alone in case of accidents
5) keep all your skateboarding gear well maintained

If you want to learn how to skateboard like a pro, there is one important thing you need to know. Visit this site now to find out what I'm talking about. Learn Skatebaord Tricks