Step 11

I want to spike out some lines but as a right hander I’m not very good at drawing from top left to bottom right or vice versa. Therefore to speed things up, the canvas is flipped by choosing Image > Rotate Canvas > Flip Canvas Horizontal. You may have noticed that it’s bound to the hotkey F1 in my example, which would be by default assigned to an external Photoshop Help link. You can assign hotkeys this one by choosing Window > Workspace > Keyboard Shortcuts & Menus and clicking the Keyboard Shortcuts tab.

Step 12

Wow that’s not a straight line. It’s OK if it something goes wrong, it’s just us practicing twice as much as everybody else. If it does turn out like a curve graph from a science experiment, just undo it (Cmd+Z) and try again. The other vanishing point is on a new layer, which gives us the option to hide it while we work on this second vanishing point.

Step 13

Eleventh time’s always a charm.

Step 14

If at first you don’t succeed, use the Free Transform Tool (Cmd+T).

You may rotate the line by Left-clicking the mouse when the cursor changes upon hovering just outside a corner of the Free Transform bounding box.

Step 15

Finish some more lines until you are comfortable with it. We’ll flip the canvas back by clicking Image > Rotate Canvas > Flip Canvas Horizontally. I’ve also lowered the opacity of the two vanishing point layers to make it easier to see what we’re about to do.

Step 16

The lines going into the distance (red) go towards the first vanishing point as with the one-point perspective drawing (step 3).

Step 17

Look at the dotted red lines in the example; we can see where the corners of the next face would be (circled). Here’s where your psychic projection powers come in – some imagination here helps to picture where the lines and face would go. If it looks correct in your head, you’re probably on the right track.

Step 18

If we proceed to draw the parallel lines (red) going towards the second vanishing point (VP2), we’ve got a perfect join to the previously circled corners – the two ends of the previous dotted line.

Step 19

This technique works even on complicated symmetrical shapes, provided there are parallel lines. If we look at the example below-from the initial corner circled in red-we can simply follow it along the first perspective lines (black) until it hits the other vanishing point (labeled "collide" in example), from which it will then follow the second vanishing point’s perspective lines (red) back down, stopping at the point where it is horizontally parallel alongside the horizon (pink). I made it sound much more complicated than it is, check out the image.

Step 20

Doing this for all the points gives us perfect locations for each corner.