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Rendering is the third and final step in the simple creation of a 3D model. Rendering refers to the image being visualized with images being created from the 3D model.
There are many features of a rendering, these include; transparency, shading, shadows, reflection, depth of field, caustics, fogging, bump-mapping and texture mapping. These features are the most commonly used when an object has been rendered.
The transparency of a rendering can be adjusted, and details the transmission of light through objects giving the viewer a line of slight through the object.
Shading of a rendering can be adjusted on the surface to create a darker or light effect. This is adjusted with how the light of the scene diffuses into the object.
The shadows of a rendering can be changed with the scene lighting. Some parts of the scene may be lighter than others therefore causing variations in the light that is shown in the object.
To incorporate a mirror effect on an object rendering will give a reflection, a sharp – shiny reflection of the object.
Depth of field can cause the focus of the object to shift, for example – part of the object in the foreground may be in clear focus, while object outside of the depth of the field will become less defined or blurry.
Using caustics while creating a rendering can illuminate certain parts of the rendering using highlights, mirrors and transparency tools.
Fogging an object in the rendering process directs how the light will dim while passing through air that is not clear, similar to the way that we see fog in real life.
Bump and texture mapping are both ways of creating surfaces upon the shell of the object. These incorporate texture and detail and add lifelike qualities to inanimate surfaces.
This overview highlights the most common effects used in the rendering of objects in the 3D modeling process. The options are practically endless, although most 3D modelists find these to be the most popular, and useful while creating 3D models.
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Geological modeling serves the purpose of creating 3D models of sections of the earths crust. These 3D models are unique as they can be created with different types of simulations of rocks, even the types of cells within the rocks. 3D models allow seismologists to predict certain events within the crust of the earth from shifting plates to eroding areas of the crust, or new growth within certain areas.
The grid surfaces within the programs are created with diverse polygons representing different structures and types of surfaces. These geological models are created using polygonal modeling using a meshed shell to create a surface that has been triangulated for the specific area.
3D geological modeling incorporates many other aspects of the field, including; diagenesis, structural geology, paleoclimatology and sedimentology.
Oil and Gas industries use these models to determine how the ground will react when the drills are inserted. These models are used to plan for any disturbances that may occur, as well as any weak points within the crust that could cause difficulty. If an accident were to occur, the 3D model allows the engineers to determine a plan of action for a variety of outcomes that may occur.
3D geological models are also used to complete valuable calculations for use in geostatistics. Many times, geologists are unable to calculate what is within the rock or within the crust at certain areas and therefore it is important to have software that can calculate these variables. This data is not available on regular grids and therefore must be estimated in the most effective manner.
Many popular software systems have been developed to create these 3D geologic 3D models; Roxar, Paradigm and Jewelsuite are only a sample of the programs available. These powerful software systems are able to display and calculate parameters required for many professionals involved in Earth Sciences.
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There are three types of modeling that are used to create a 3D model, these are; spline modeling, box modeling and poly modeling.
The firs type of 3D modeling discovered is spline modeling. Spline modeling has also been referred to as patch modeling and allows a curve to be created with the use of two control points. These points are created in multiples to create the skeletal system of the model. This form of modeling is best for objects that are not going to be animated, as they require a lot of modifications to be suitable for the animation process. Cars, furniture and real estate models are examples of which types of models work best within the Spline modeling process. These types of models require an extensive amount of curved shapes and therefore work best with Spline modeling.
The modeling form that lies the most similar to sculpting is the technique called box modeling. It begins with a cube shaped, and details the object by removing layers or slices. Again, box models can be difficult to animate and take extended periods of time to create, and perfect. Box modeling is used for objects with hard lines such as tall, traditional buildings.
Poly modeling is also referred to as edge extrusion. It is one of the most precise techniques as it will begin with a 3D image consisting of points, which are built upon. These sets of four points are referred to as quads, and the second is attached to the first, and the third is attached to the second, and so on. The model is created from the bottom up, and can take extended periods of time but requires less adjusting than traditional modeling methods. Shell models, which contain the surface shape without an interior, can be easily created with poly modeling. The most advanced technique; poly modeling has been popularized with new technology and software.
Creating 3D Models with NURB Modeling
NURB modeling or, non uniform rational b-spline modeling creates 3d models with varying surface representations. This type of modeling allows for the curves that we see in sleek vehicle models and architecturally curved buildings.
Specific aspects of a NURB model include; knot vector, control points and the order of these items. Control points are arranged in a specific order, thereby creating the curve that is represented in the 3D model. Weight is applied to certain points on the curve and these weighted points account for the direction of the curve.
NURB models have grown popular in the creation of organic 3d models as the surfaces represented are actual curves, not tiny lines creating curved appearances like other 3D model creation software.
The use of NURBs within 3D modeling allows the user to create shape within its compact form. They allow mapping within the 3D space of the surface predetermined by control points. These control points determining the shape of the space, thereby resulting in a feasible 3D model.
The creation of NURBs has allowed higher level tools to be created. These tools include; positional continuity tools, tangential continuity tools as well as curvature continuity tools.
Some 3D model creation software has been created to use solely NURBs modeling processes. Maya is an example of this software. Maya has been adapted to use NURBs modeling and therefore is adequate for 3D modeling projects that require curved, detailed surfaces required in organic modeling.
There are many benefits to using NURBs curves in the creation of 3D models; they reduce the memory consumption when storing shapes, and using the curbs can create a wide variety of shapes in varying sizes. NURBs curves have the ability to be used in a 2 or 3D modeling space and therefore are a versatile design tool. The curves can be assessed using specific algorithms quickly and efficiently.
Types of 3D Modeling: Polygonal Modeling
Polygon modeling refers to 3D modeling which use polygons to create the shell of a 3D model. The polygons are used to create the mesh surfa
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