While constantly improving 3DDM (drawTriangles() version soon to be released), I was looking for the fastest possible solution to render simple 3D object. It soon appeared to be drawTriangles() – the native ActionScript 3 method, that let you make illusion of 3D object based on deforming your texture. In fact native ActionScript contains a lot of useful and fast classes to work with 3D like: Utils3D, Vector3D, Matrix3D, PerspectiveProjection… so you do not need to create your own basic 3D engine tools. One thing that it does not contain is z-sorting. Z-sorting is very tricky job, that is why modern 3D engines let you decide which sorting method to use with your scenes (faster vs. precise). For my needs it is enough to use simpliest z-sort possible, based on projected max z coordinate of face (3 vertices).
Before continue reading, make sure you understand the basics of Using triangles for 3D effects, Transforming bitmaps, UV mapping and Culling. Everything is very good described by Adobe.
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