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giugio

position and direction of light

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hello.
I have this document:
http://www.3drender.com/light/3point.html
how i can find the position of the three lights ?
What formula of trigonometry i must use?
for example the key light is on 45 degree at sx of camera.
how find the direction and position of key light by the position and direction of the camera?
thanks.

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There is no "one" solution to this question. Key, fill and backlights must be placed in the scene to make the subject matter look good, which is completely subjective. As shown in the doc, they only give you a rough idea of placement, the actual position and orientation of each depends on the setting, materials, camera settings etc.

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