Sjoerd W Bijleveld

In Blender I positioned a couple of "spheres" exactly on a reference spot in a background image (also loaded in Blender). I exported these objects to an .obj file. In Max I loaded exactly the same background image as used in Blender, using the 'jit.gl.videoplane' object, and loaded the .obj file (contaning the spheres) into a 'jit.gl.model' object. (The background image and the spheres are displayed in a jit.window' object). To my surprise the spheres do not appear on the same spot as in Blender, they are all off, not a litlle bit but substantially and the weird thing is it is not uniform. So sphere 1 is off (for instance, because I don't know exactly how much) relatively to the spot for 20 pixels, sphere 2 is off for let's say 10 pixels and sphere 3 for 12 pixels. I did also export the model as .dae and then the objects are even more "off". I hope I'm clear in my explanation and hopefully someone can tell me what is the problem and more importantly how to fix it! Thanks in advance!

In Blender I positioned a couple of "spheres"  exactly on a reference spot in a background image (also loaded in Blender). I exported these objects to an .obj file. In Max I loaded exactly the same background image as used in Blender, using the 'jit.gl.videoplane' object, and loaded the .obj file (contaning the spheres) into a 'jit.gl.model' object. (The background image and the spheres are displayed in a jit.window' object). To my surprise the spheres do not appear on the same spot as in Blender, they are all off, not a litlle bit but substantially and the weird thing is it is not uniform. So sphere 1 is off (for instance, because I don't know exactly how much) relatively to the spot for 20 pixels, sphere 2 is off for let's say 10 pixels and sphere 3 for 12 pixels. I did also export the model as .dae and then the objects are even more "off".  I hope I'm clear in my explanation and hopefully someone can tell me what is the problem and more importantly how to fix it! Thanks in advance!

In Blender I positioned a couple of "spheres"  exactly on a reference spot in a background image (also loaded in Blender). I exported these 

objects-not-lining-up-with-background-image

first thing to test is disable jit.gl.model normalize (@normalize 0).

beyond that, my guess is you must make sure the aspect ratio of the background image is the same in both apps. 

if you want a square aspect ratio, use jit.gl.videoplane @transform_reset 1

if you want to the aspect ratio to match that of the display window, use jit.gl.videoplane @transform_reset 2

if you want the background image to keep the aspect ratio of the source image file, use jit.gl.videoplane @preserve_aspect 1

beyond that, my guess is you must make sure the aspect ratio of the background image is the same in both apps. 
if you want a square aspect ratio, use jit.gl.videoplane @transform_reset 1

Thank you for your advice! I did test adding the several attributes you mentioned, but nothing helped. As soon as I add or change an attribute either the background "disappears" (I'm not sure if they really disappear, maybe in certain cases they are obscured by each other) or the objects or both. Only the default mode(s) show both objects and background, but still not aligned.

If it helps (and you are willing to dive deeper into this) I can send you the patch and the Blender file... I would appreciate all the help, because this has already taken several days of my time and is really frustrating.

Thank you for your advice! I did test adding the several attributes you mentioned, but nothing helped. As soon as I add or change an attribute either the background "disappears" (I'm not sure if they really disappear, maybe in certain cases they are obscured by each other) or the objects or both. Only the default mode(s) show both objects and background, but still not aligned.
If it helps (and you are willing to dive deeper into this) I can send you the patch and the Blender file... I would appreciate all the help, because this has already taken several days of my time and is really frustrating.

post your patch and your files and steps to reproduce and i'll take a look

OK Rob! I have attached a zip file with all the necessary files. I also include the Blender file and when loaded it should automatically show the background image (FMvideo.png) and the "sphere"-objects positioned on this image. In the patch I have indicated which files to load using the read object. Of course many thanks in advance!

Unfortunately for an unkown reason the system would not attach the zip file I had prepared. So I used your Cycling74 email address to send you the file. Sorry for that!

Hi Rob,
Unfortunately for an unkown reason the system would not attach the zip file I had prepared. So I used your Cycling74 email address to send you the file. Sorry for that!

objects not lining up with background image