What are Gouraud Shading and Texture Mapping in 3-D Video Games? > 자유게시판

The vast majority of 3-D objects created for laptop games are made up of polygons. A polygon is an area outlined by lines. To have a polygon, you must have at the very least three strains. The lines connect a sequence of coordinates in the three-dimensional "area" the pc creates. The purpose the place the traces join in generally known as a vertex. Each vertex has X, Y and Z coordinates. Flat shading simply assigns a single coloration to a polygon. It's very simple and fast, but makes the article look very artificial. Gouraud shading is more involved. Colours are assigned to every vertex, then they are blended across the face of the polygon. Since every vertex is typically related to a minimum of three distinct polygons, this makes the thing look pure as a substitute of faceted. You will discover that the ball with Gouraud shading appears much smoother than the flat shaded one. But look closely on the outlines of the 2 balls.

That's where you can tell that both balls have the very same number of polygons! A extra complex version of shading, Phong, is never used in games. Where Gouraud shading interpolates colors by averaging between the vertices, Phong shading averages every pixel based mostly on the colors of the pixels adjacent to it. One other frequent approach for determining the appearance of a polygon is to make use of texture mapping. Think of texture mapping like wrapping a present. Each facet of the box you might be wrapping is a blank polygon. You would paint the field, however it can be very tough to make it match all of the designs on the wrapping paper. Nevertheless, if you take the wrapping paper and tightly cowl the field with it, you've gotten completely remodeled the field with just just a little effort. Texture mapping works the same means. Mapping requires using another image. This different image primarily is stretched over the object like a pores and skin. Most video sport consoles and laptop graphics adapters include a special chip and devoted Memory Wave Routine that stores the particular pictures used for texture mapping and applies them to every polygon on the fly. This permits video games resembling Tomb Raider to have extremely detailed 3-D environments you could interact with in real time.

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