All very well and good, but they seem to have replaced the theta and phi values and I need those for the krpano, so if the formula is available, let me know.  I have noticed that for a 360 degree pano the Xn value is 0 to 1, but for other panos it is not simply the FOV where 1 is 360.

bradtem wrote:

All very well and good, but they seem to have replaced the theta and phi values and I need those for the krpano, so if the formula is available, let me know.  I have noticed that for a 360 degree pano the Xn value is 0 to 1, but for other panos it is not simply the FOV where 1 is 360.

Hi.. I think you are confusing two mathematical terms and uses. A Virtual Tour, as far as I understand, does not use the rho, phi or theta maths since that is used for calculating the spherical surface of a sphere, ie longitude and latitude etc.. As I understand it, a Virtual Tour pano uses the Cartesian Coordinates System, which is the spacial values of a sphere - x and y with no z value since that is an absolute position, which cannot be changed. The rho, phi, theta are Spherical Coordinates. There are similarities but the maths is different ie; But I might be wrong since I look at the word in 3D..

x = p sin ϕ = θ
y = p sin ϕ sin θ 
z = p cos ϕ

With regards to the krpano question, I would do search on that web site.. Its full of good information...

Destiny...

Last edited by Destiny (2012-09-28 10:11:58)

Krpano doesn't seem to have much docs on working with APP/APG.     As noted I am not interestd so much in theta and phi, though I had worked out formulae for those numbers because they were used in the old .pano format.   What I really want are the hfov, vfov and yoffset that krpano uses (and which, to an extent, APP displays when you have the crop tool on display.   Are the formulae the same for cylinders?  I mostly do cylinders and a few planars and now the Panninis -- I only rarely do spherical.   I have never called this "virtual tour" as I don't even usually do 360 degree panos, but krpano and its ilk are the only tools to let you display a large pano on the web.

I was under the impression that with the partnership between krpano and Kolor that a lot of people are mapping APP generated panos into krpano files and so you might want to consider officially supporting this in some way.   I realize that the parameters in the .pano file are not generally officially supported.

Hello,

In spherical coordinates:

Theta = (2 * x - 1) * Pi
Phi_min = Pi/2 - Pi * ymax
Phi_max = Pi/2 - Pi * ymin

When ymax = 1 ==> phi_min = -Pi/2
When ymin = 0 ==> phi_max = Pi/2

That's what I can see in the crop window (with a conversion between radians and degrees of course)

Do I miss something ?

Regards,
Thomas

Hello bradtem,

After a deeper look at what you need, I think you could just use what is stored in panorama exif.
Indeed, there is a field named 'UserCOmment' in the EXIF containing several informations. It seems to include the Fovs and the offset you need.

Hope it helps,
Thomas

Yes, that's what I mean by "and its ilk" -- the browser based zoom viewers.    I have many photos on gigapan, hardly unaware of it.

Oh, in the early days the first viewers, like the quicktime vr player, were independent programs or possibly worked via java applet or dedicated plug-in.   Even today, the players are usually flash based though some html 5 based viewers are now available, entirely browser based.