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hmm if you have double checked your imported obj values then the error lies in your rendering code. when i first executed my obj loader on the psp the output was like this : simple box but after I added sceKernelDcacheWritebackAll all was working as expected well I don't know if it really was sceKer...

I made one myself and I had strange glitches too but they were gone after I put a sceKernelDcacheWritebackAll() in front of my rendering code ;)