Editing Forced perspective (section)

===Role of light===
Early instances of forced perspective used in low-budget motion pictures showed objects that were clearly different from their surroundings, often blurred or at a different light level. The principal cause of this was geometric. Light from a [[point source]] travels in a spherical wave, decreasing in intensity (or ''[[illuminance]]'') as the [[inverse square]] of the distance travelled. This means that a light source must be four times as bright to produce the same illuminance at an object twice as far away. Thus to create the illusion of a distant object being at the same distance as a near object and scaled accordingly, much more light is required. When shooting with forced perspective, it's important to have the aperture stopped down sufficiently to achieve proper depth of field (DOF), so that the foreground object and background are both sharp. Since miniature models would need to be subjected to far greater lighting than the main focus of the camera, the area of action, it is important to ensure that these can withstand the significant heat generated by the incandescent light sources typically used in film and TV production.<ref>{{Cite web|url=https://www.bbc.co.uk/bitesize/guides/ztc297h/revision/7|title=Scientific calculations - Direct and inverse proportion - Higher - Photosynthesis - Edexcel - GCSE Combined Science Revision - Edexcel|website=BBC Bitesize|language=en-GB|access-date=2020-04-22}}</ref>