So, after on nearly every new projector I work with I have to write the support regarding false lens shift settings, I suggested they could provide a generic projector with wide zoom and shift settings. I tried to use it, but now I can't get a proper scaled picture out of it. Wrote the support and they said everything is fine. So I want to let judge you with the screenshot attended: 2 Projectors, one Panasonic and one Generic with exact same position and exact same lens settings. Shouldn't they project the same picture? Why is the generic one creating such a stretched picture? How should i work with this?
Are they both set to 16:9?
Capture stretches the assigned media source to fill the aspect ratio of the projector. It will apply non-uniform scaling, i.e. it will scale horizontally separately to vertically, it's more of a UV mapping than a scaling in that it applies the whole of the texture to the whole of the beam. You can see that the test pattern is being distorted as the circles are not circles, so the native resolution of the projector does not match the media player or the media being fed to it.
The generic projector is a 4:3 aspect ratio, with no option to change it. if you want to use it to simulate a 16:10 projector, then you would need to set the vertical scale to .8333...
In your picture, the generic projector will be spilling the top and bottom of the surface you're aiming at, if you put a second larger surface behind that one you will see the rest of the image.
With those pieces of information, unless you're warping the input to the generic projector separately to the panasonic WUXGA projector, then you will not be able to achieve overlaying the two projectors.
You should use media the correct resolution, into a media player (or capture device) that is the correct resolution. Then you should be able to achieve what you're trying to do. If you put in something like a barco UDM22 which is also a 16:10 chip, you would be able to overlay that to your panasonic.