Polygons Vs. Triangles
Polygons
In elementary geometry, a polygon is a plane figure that is bounded by a finite chain of straight line segments closing in a loop to form a closed chain or circuit. These segments are called its edges or sides, and the points where two edges meet are the polygon's vertices (singular: vertex) or corners. The interior of the polygon is sometimes called its body. An n-gon is a polygon with n sides; for example, a triangle is a 3-gon. A polygon is a 2-dimensional example of the more general polytope in any number of dimensions.
Also a thing to remeber the more polgons that are there on your model the longer it will take to render because the amount of polygons take up memory and download speed, this is used so it can be rendered from a project to a image (Jpeg)
Rendering
Real-time rendering is one of the interactive areas of computer graphics, it means creating synthetic images fast enough on the computer so that the viewer can interact with a virtual environment. The most common place to find real-time rendering is in video games. The rate at which images are displayed is measured in frames per second (frame/s) or hertz (Hz). The frame rate is the measurement of how quickly an imaging device produces unique consecutive images.
Graphics rendering pipeline is known as the rendering pipeline or simply the pipeline. It is the foundation of real-time graphics. Its main function is to generate, or render, a two-dimensional image, given a virtual camera, three-dimensional objects (an object that has width, length, and depth), light sources, lighting models, textures, and more.
https://en.wikipedia.org/wiki/Real-time_rendering
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