3D Computer Graphics

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3D computer graphics Viktor Novičenko Smithy of ideas 2011 Main idea – I define for computer objects forms, colors, materials define lights source and it position. And computer will calculate how the objects is look like, looking from camera. This picture is “drawing” by computer! 2D computer graphics Primitive element - pixel features: color – defined by integer number from 0 to 255 red green There are another color palettes: HSV, CMYK blue 3D computer graphics Primitive element – polygon (restricted plane somehow oriented in virtual 3d space) Each object form can be constructed from polygons. Example screw: Computer per 7 min. 38 sec. will calculate how screw is look like using some kind of environment. workflow: • modeling – object form construction from polygons • texturing, shading – define object material and accept colors, using 2d picture (texture) • animation (if we want make movie) – define movement of polygons in scene • rendering – final picture calculation And after render we have .... Plenty of tools in 3d packages: Photoshop – 2d graphic redactor Maya – 3d graphic redactor Texturing – we must make UV layout to define each polygons pixel’s color. Material definition (shading) – a lot of parameters, which influence of reflection and refraction algorithms. Most heavy materials is “subsurface scaterring” Materials. Render – program which on input has scene file(polygonal objects, materials, textures, lights sources and camera position) and on output is final 2d picture. bias unbias Indigo render Vray (bulgarija) Maxwell render Mental ray (vokietija) Octane render Renderman (JAV) 5 years ago coputers is to slow for using Final-Render (D.Britanija, Kanada) unbias rendering algorithms. Bias Unbias Light source Light source Camera Camera Object surface Object surface Bias renders has direct and indirect Unbias renders is closed to real world. light calculations algorithms All lights are just “lights”. There are no different between direct and indirect lights. Example of bias render with direct light only and direct + global illumination 3D softwares: • Autodesk 3D MAX • Autodesk Maya • Autodesk SoftImage • Blender (Linux/GNU license) • Sidefx Houdini • MAXON Cinema 4D 3D Max VS Maya .

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