Two point perspective relies on the premise that all receding lines converge at one of two points along the horizon line. Lines that do not recede will be drawn only as vertical lines.In both one and two point perspective the horizon line will always be the same as the eye level. Both vanishing points must lie on the horizon line. Receding lines from the wall to the right will converge at a vanishing point to the left while receding lines from the left will converge to the right. The location of each vanishing point will depend on the view point.
Two-point perspective can be used to draw the same objects as one-point perspective, rotated: looking at the corner of a house, or looking at two forked roads shrink into the distance, for example. One point represents one set of parallel lines, the other point represents the other. Looking at a house from the corner, one wall would recede towards one vanishing point, the other wall would recede towards the opposite vanishing point. Two-point perspective has one set of lines parallel to the picture plane and two sets oblique to it. Parallel lines oblique to the picture plane converge to a vanishing point, which means that this set-up will require two vanishing points.
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