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Added OBJ converter test example. Modified Three.js to handle converted models: - extended WebGL renderer to use texturing - broke down model into multiple VBOs according to materials - textures are lazy created when images get loaded (converter takes care of resizing images to nearest power of 2 dimensions using 2d canvas) - changed material array semantics in Mesh object - before: multiple materials were applied to all faces (broken in WebGL, needs multitexturing shader) - now: there is only single material per face, but one mesh can have faces with different materials - added per vertex normals (to get smooth shading in WebGL)
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