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This is a monstrous one and two point perspective grid I made in Sai and turned into PSD, which actually can still be opened in sai if I'm not mistaken. The reason it's huge is to make sure the distortion radius (the blue circle) will not get in your way, since people bitch about distorted perspective even though I think it's super cool.
HOW TO USE.
1) After opening, IMMEDIATELY resave this file with a new name for whatever you're working on. So you don't accidentally save over this after drawing a bunch of dicks and have to redownload it cuz you screwed it up somehow. Better safe than sorry!!!
2) Adjust grid folder's opacity in the layers panel to set the grid for how transparent you want the grid!
3) The viewport is something used to give yourself a picture plane. So snip off the excess borders, scale it or transform it, do whatever to give yourself a clear view of what you need to be drawing.
I MEAN YOU CAN DELETE IT TOO, LIKE I EVEN CARE.
Edit: I added a one point perspective layer, it's kind of slapdash and inconsistent looking of course, but you can move it around the screen since the lines stretch outside the canvas borders. Seems to work in Sai as well. But with this extra one point layer added you can make THREE point perspective! Oh man! ALSO YOU CAN DUPLICATE THE ONE POINT LAYER AS MANY TIMES AS YOU WANT AND SO THERE'S LINES EVERYWHERE AND YOU WON'T KNOW WHAT YOU'RE LOOKING AT!!
hOPE THIS HELPS! CAPS LOCK OOPS