I have changed this comment several times over the last hour. C4D. Is this Cinema 4D software ?
Ok OFF line. Meaning you are either displaying the panorama from a notebook hard drive or you have placed the panoramas on a DVD and are running them on the notebook.
let´s assume i have a fixed window size of 1024x768.
for a start FoV of 70 the optimal cube face size would be 1096px.
I do see where you are getting this information... in the Flash/QTVR OUTput dialog box. Insert the Window size 1024 x 768 and the recommended Cube face Optimal adjusts to 1096 pixels. So it follows, that for Optimal cube face size is 1096.. then what would be panorama image width ?
Determine cube face size of 3443 pixels/ Pi 3.1416 = 1096 pixels
and the inverse is true too
Cube face size of 1096 px x Pi 3.1416 = 3443 pixels wide.
1024 x 768 is also a notebook screen native resolution. Also remember that unless you go full screen option the browser top IE tool bar takes up at least 120 pixels so screen height available vertical space would be about 648. And you cube face px changes to 925px
What would I use ? Sometimes I use 6000 x 3000 or 5000 x 2500 for the World Wide panorama Event. I still get excellent results displayed on our 24" or 12" notebook monitor
Cube face dimensions technique still apply regarding best image quality (regardless of file size). You are correct if you leave the image compression for all cube faces at 100%.
Other stuff that might be of interest.
I have been told that normal FOV for human eye sight to look normal is 50°. That is why 50mm lenses are typically stock lenses for new cameras. Pano2VR uses a default value of 70 which is good too. Only issue is when viewing the panorama.. the zoom in/ out limits must be manually set to prevent zooming out too far and seeing BARREL distortion and zooming in too far that the image gets pixelated. So
In Pano2VR main screen I would select 'Viewing Parameters' and click the [modify] button and
top 3 values are Pan, tilt, FoV.
I would use the
pan to rotate around to where you wish to see the initial view. I am looking at mine it says 345.5 pan angle.
Tilt is tilted down -1.5 degrees from the horizon because I have a interest item I want the visitor to see first.
Fov is set to 71.0 which is very close to your FoV value. You can use the Shift key to zoom IN and the CTRL key to zoom out. Notice the values change on the left side "Current". When you feel visually comfortable that this viewer is showing the INITIAL VIEW zoom in/out .. then click on the [SET] button.
Below is Field of View (Zoom) limits. Think of a water well with a limit switch... water drains down too far and the limit switch turns on to fill .. when the water rises up.. the limit switch float then clicks and turns off the pump. These MIN MAX values are similar to the float limit switch functions.
MIN means zoom IN value.. this the angle of view in horizon degrees the viewer will be able to see when fully zoomed in.
MAX means zoom OUT value. This is the widest angle of view in degrees the viewer will be ble to see when fully zoomed out. Too far out generally produces a very barrel distorted view of the scene.
So with an angle of view of 70 degrees viewing angle from left to right, I would probably set the zoomed in limit angle of view to say around a narrower 30 degrees. And 100 degrees viewing angle on the horizon.. would be far enough zoom out.
LIMITS MIN zoom in 30 <<< initial view 70 >>>>>> 100 MAX zoom out.
By tweaking the Viewing Parameter/ limits FoV up/down increment arrows you can visually see the different viewing angle values to use in the MIN/MAX value boxes.
What values to use? Really its your judgement call. But with each Max /Min setting I would return to the main menu.. and generate and view the results until you are satisified with the value results.
Your last question
another question would be the performance.
is using bigger cube face sizes very bad for performance when the window size (view size) stays the same ?
The answer is that it probably has little affect as long as the cube face size is proportioned to the panorama image width. You achieve little in the way of quality or computer video card display performance by making the cube face sizes larger. Bigger cube face tile sizes? Needs BIGGER stitched panorama width.
BUT you probably already knew all this.