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A reconstruction program can create three-dimensional objects that mimic the real objects from the photographed scene. Using data from the point cloud and the user's estimation, the program can create a virtual object and then extract a texture from the footage that can be projected onto the virtual object as a surface texture.
3D modeling – the process of forming a computer model of an object's shape; Layout and CGI animation – the placement and movement of objects (models, lights etc.) within a scene; 3D rendering – the computer calculations that, based on light placement, surface types, and other qualities, generate (rasterize the scene into) an image
In video game development, 3D modeling is one stage in a longer development process. The source of the geometry for the shape of an object can be: A designer, industrial engineer or artist using a 3D-CAD system; An existing object, reverse engineered or copied using a 3D shape digitizer or scanner
Determining which pixels are covered by each geometric shape in the 3D scene or 2D image (this is the actual rasterization step, in the strictest sense) Blending between colors and depths defined at the vertices of shapes, e.g. using barycentric coordinates (interpolation)
An example of computer animation which is produced from the "motion capture" techniqueComputer animation is the process used for digitally generating moving images. The more general term computer-generated imagery (CGI) encompasses both still images and moving images, while computer animation only refers to moving images.
If a new object or new lighting is introduced into scene or if some object that is reflected in it is moving or changing in some manner, then the reflection changes and the cube map must be re-rendered. When the cube map is affixed to an object that moves through the scene then the cube map must also be re-rendered from each new position.
The first step in SIFT is finding a dominant gradient direction. To make it rotation-invariant, the descriptor is rotated to fit this orientation. [3] Another common feature detector is the SURF (speeded-up robust features). [4] In SURF, the DOG is replaced with a Hessian matrix-based blob detector.
The simplest solid objects used for the representation are called geometric primitives. Typically they are the objects of simple shape: cuboids, cylinders, prisms, pyramids, spheres, cones. [1] The set of allowable primitives is limited by each software package. Some software packages allow CSG on curved objects while other packages do not.