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| BACK TO TUTORIAL/CRITIQUE INDEX. | |
| 01: TUTORIALS | |
| 2 POINT PERSPECTIVE CONSTRUCTED FROM A PLAN VIEW.
THE SKETCH BELOW SHOWS ONE WAY YOU MIGHT CONSTRUCT A PERSPECTIVE TO ENSURE THAT YOU'RE ACTUALLY DRAWING A CUBE (AS OPPOSED TO A RECTANGULAR PRISM, FOR EXAMPLE). THE PROBLEM WITH THE "PICK TWO POINTS ON THE HORIZON LINE" METHOD IS THAT YOU END UP HAVING TO EYEBALL WHERE THE BACK EDGE OF THE FACE IS. IF YOU'RE ANAL ENOUGH, THAT PROBABLY BUGS YOU A LITTLE. THE SKETCH BELOW IS ACTUALLY 2 DRAWINGS - A TOP VIEW AND A PERSPECTIVE VIEW. THE TOP VIEW ALLOWS YOU TO DETERMINE EXACTLY WHERE YOUR VANISHING POINTS SHOULD BE, AS WELL AS HOW TALL THE FRONT EDGE IS AND ALSO HOW FAR BACK THE BACK EDGE SHOULD BE. THE "PICTURE PLANE" IS AN IMAGINARY SHEET OF PAPER THAT YOU ARE DRAWING ON. IT DOESN'T HAVE TO BE RIGHT UP ON THE CORNER OF THE CUBE - IT CAN ACTUALLY BE ANYWHERE, BUT PUTTING IT THERE IS THE SIMPLEST CASE. THE STATION POINT IS WHERE THE OBSERVER IS STANDING. BECAUSE THIS IS A TOP VIEW THERE IS NO PERSPECTIVE - THE EDGES OF THE CUBE ARE PARALLEL AND DON'T APPEAR TO CONVERGE TO A POINT IN THE DISTANCE LIKE IN A PERSPECTIVE DRAWING. BECAUSE OF THAT, WE CAN DRAW TWO (GREEN) LINES THAT ARE PARALLEL TO THE SIDES OF THE CUBE FROM THE STATION POINT TO THE PICTURE PLANE. THE POINTS WHERE THE GREEN VIEW LINES CROSS THE PICTURE PLANE TELL YOU WHERE THE VANISHING POINTS ON YOUR PERPSECTIVE DRAWING OUGHT TO BE. NOW ON THE PERSPECTIVE DRAWING, YOU CAN JUST PLOP DOWN THE HORIZON LINE, AND THEN DRAW THE FRONT ELEVATION OF THE CUBE AS A REFERENCE. (NOTE THAT THE ELEVATION IS PLACED BELOW THE HORIZON LINE.) SINCE YOU DECIDED TO PLACE THE PICTURE PLANE RIGHT ON THE EDGE OF THE CUBE IN THE TOP VIEW, YOU CAN DIRECTLY TRACE THE DIMENSI0NS FROM YOUR FRONT ELEVATION (THEY ARE THE SAME SIZE, BEING A CUBE AND ALL..). THE LIGHT GRAY LINES ON THE TOP VIEW DRAWING ORIGINATE FROM TEH OBSERVER AND CONNECT TO THE CORNERS OF THE CUBE. THE POINTS AT WHICH THESE LINES CROSS THE PICTURE PLANE GIVE YOU THE LOCATIONS FOR THE EDGES ON YOUR PERSPECTIVE DRAWING. |
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