Importance of vanisng point
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A vanishing point, or point of convergence, is a key element in many works of art. In a linear perspective drawing, the vanishing point is the spot on the horizon line to which the receding parallel lines diminish. It is what allows us to create drawings, paintings, and photographs that have a three-dimensional look.
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The vanishing point is the perspective image of the point where a bundle of parallel lines seem to converge. (Example: Road)
We can find this point by shooting a ray in the direction of the parallel bundle and finding its intercept with the imaging plane.
Ray bundles parallel to the imaging plane do not have vanishing points!
If you have multiple bundles of parallel lines in the same plane,
then all their vanishing points form a vanishing line (or a "horizon") -- example: "2-runway airfield".
Vanishing line = "horizon" of a plane = collection of the vanishing points of all the lines in the plane.
Parallel planes have the same vanishing line.
To find their vanishing line, pick the one parallel plane through the eye point and find its intersection with the imaging plane.
We can find this point by shooting a ray in the direction of the parallel bundle and finding its intercept with the imaging plane.
Ray bundles parallel to the imaging plane do not have vanishing points!
If you have multiple bundles of parallel lines in the same plane,
then all their vanishing points form a vanishing line (or a "horizon") -- example: "2-runway airfield".
Vanishing line = "horizon" of a plane = collection of the vanishing points of all the lines in the plane.
Parallel planes have the same vanishing line.
To find their vanishing line, pick the one parallel plane through the eye point and find its intersection with the imaging plane.
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