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I am just trying Octane on my scene and can't figure out why viewport doesn't render anything. Is it overexposed or something?

Open console window and check for cuda errors. You looks like have that

actually, yes you're right. What does it mean? I have the latest driver i believe GTX 660ti, 416.94


Tried to access attribute via invalid ID A_ALLOW_STATISTICS_COLLECTION (10)
CUDA error 700 on device 0: an illegal memory access was encountered
-> kernel execution failed(kernel25)
CUDA error 700 on device 0: an illegal memory access was encountered
-> failed to launch kernel(kernel34)
device 0: direct light kernel failed
CUDA error 700 on device 0: an illegal memory access was encountered
-> failed to load symbol data to the device(kernel data)
device 0: picking failed
CUDA error 700 on device 0: an illegal memory access was encountered
-> failed to unregister pinned memory
CUDA error 700 on device 0: an illegal memory access was encountered
-> could not get memory info
CUDA error 700 on device 0: an illegal memory access was encountered
-> failed to unregister pinned memory
CUDA error 700 on device 0: an illegal memory access was encountered
-> could not get memory info
CUDA error 700 on device 0: an illegal memory access was encountered
-> failed to unload module
CUDA error 700 on device 0: an illegal memory access was encountered
-> failed to create link
device 0: failed to create OSL compile context:

device 0: failed to compile module 0

Not important! See VRAM usage and free amount of that. You're on the insufficient amount of VRAM most likely.

it used up all the ram and failed to render. So, does it mean I can't use octane unless I buy a better graphic card?