3D Graphic & OpenGL

3D effective

• rendering -  process of  indicate to the screen to have graphic information of third demension
• foreshortening (perspective) - a technique of third demention which controls angle between of th line
• shading -  illuminations to the application
• texture - image on the page becomes accomplished with texel
• blending -  mixture to screen coat color and object (transparency, reflective etc.)

 

Scene graphs

• retained mode - reservation modes
• scene graphs - scene undergarment all objects will apply the between relationship in advance to create, the data structure (ex) game engines)
• immediate mode - real-time modes

 

Coordinate system

• coordinate system - apocenter x and y= (0,0) 
• clipping - link of location in window and OpenGL coordinates 
• mathematical coordinate system - y reduction with descends 
• windows coordinate system - y coordinate increases with descends 
• viewport - In 3D computer graphics it refers to the 2D rectangle used to project the 3D scene to the position of a virtual camera
• 3D coordinate system - 2D coordinate system + z axes (depth information)
  
• projection - projection is a protocol by which an image of an three-dimensional object is projected onto a planar surface without the aid of mathematical calculation, used in technical drawing
• orthographic projection  - derived from the principles of descriptive geometry and is a two-dimensional representation of a three-dimensional object
• perspective projection  - a type of projection where three dimensional objects are not projected along parallel lines, but along lines emerging from a single point