make torus not share the last ring
make torus not share the last ring

this way texture mapping works correctly.
Probably need to do the same for rings

greggman/twgl.js,beni55/twgl.js,beni55/twgl.js,greggman/twgl.js,WebSeed/twgl.js,ptpham/twgl.js,ptpham/twgl.js,greggman/twgl.js,eyeccc/twgl.js,WebSeed/twgl.js,eyeccc/twgl.js