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In search of the ‘reverse algorithm’

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Michael Gilligan03/06/2021 23:54:27
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Posted by Andy Carlson on 03/06/2021 22:05:43:
Posted by Michael Gilligan on 03/06/2021 00:13:24:

[…]

I'd have thought that perspective is a fact of life and (to quote Mr Scott) 'You cannae change the laws of physics'. Tilt and shift lenses can distort things but presumably there is a price somewhere else... which may not be be visible if the object is simple, solid and the right shape... but if you take the extreme case of a wireframe... maybe not possible?

To minimise perspective you'd need a long focal length and put the camera far away. With the right camera position it should then be close to isometric.. but never quite reaching it.

.

I’m increasingly unsure, Andy [of my stated belief that a [physical] technical camera can produce a true isometric image]

Perspective really depends on the viewpoint, not upon the focal length of the lens [a blow-up from a 50mm lens will be found to have the same angles as a picture from a 200mm lens], and to achieve true isometric the camera would need to be at infinity.

I will continue to ponder and experiment ...

MichaelG.

.

As food-for-thought :

  1. Telecentric lenses can do it... but that’s a rather special case.

  2. Z-axis ‘macro’ stacking produces isometric images.

 

Ref.1 :https://wp.optics.arizona.edu/optomech/wp-content/uploads/sites/53/2016/10/Tutorial_Hu_Haosheng.pdf

Ref. 2 : https://www.mccrone.com/mm/constructing-a-scanning-light-photomacrography-system/

 

Edited By Michael Gilligan on 03/06/2021 23:55:15

Edited By Michael Gilligan on 04/06/2021 00:03:40

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