thank you for answer my question..
but sorry , still don't get the point from your answer

1st problem :

every time exporting file to SKP, I always got this problem...
sliced visual on SKP... (just visual, not the final product)

2nd peoblem :

zig zag shadow...
again...just VISUAL , not the final product

no problem with the VGA card & updated
no problem with the RAM
no problem about the device...

using SKP 7 or 8, still got the same problem...

please help me to fix it...

thank you