confusion about the projection matrix used

[ChemJeff]

Hi Max,
Can you further explain your code for perspective unproject matrix? It confuses me for a while since it's not seems like in form of some standard projection matrix. Especially the following line:

SingleViewReconstruction/SDFGen/geom/math/Transform_i.h

Line 39 in 2e608ff

at(2, 3) = (2 * near * far) / (near - far);

Thanks!

[themasterlink]

I sadly do not remember exactly where I got this equation from, but it is also used in this tutorial:

http://www.songho.ca/opengl/gl_projectionmatrix.html

More precise in this picture:

Be aware that I flipped near and far value, which is the reason why there is no minus in front of it.

But I am sure there would be other solutions to this problem. But I am no expert on intrinsic camera calibration and the forms it can take.

[ChemJeff]

Thanks, that helps me a lot.