someone already posted on feedback tracker ibl backing is generating black images ????

That was a bug a couple of versions ago but was supposed to be fixed...

I just tried it, and it works for me.

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i trying but i just getting black images , maybe i doing something wrong ???

I do not think it works. Most environment diffuse colors are OFF and more on a gray side with IBL baked at 2048x1024.

Worse yet, if you try to bake 4096x2048 iClone would crash.

But that is not all! After the crash you are in a terrible mess originally described in: https://forum.reallusion.com/431430/All-my-new-scenes-are-dark-no-texture-show-up-?PageIndex=1
The texture would not render correctly for any project you open after the crash.

As I did more digging at some point after the fix was introduced in IC7.71, I figured, with IBL baking only 2 maps are involved - diffuse and specular (though as I said, diffuse is not rendered correctly for most props in the scene in an IBL baked image).
For some reason RL force it on the fly into the registry. So when crash occurs during IBL bake, those values are retained in registry and do NOT reset while iClone loaded fresh after the crash.
Any projects opened after the crash would look like this:



STILL does not look right to be with only diffuse and specular (but I leave it for RL to fix)

Temporary fix (to restore correct render) is to modify registry and disable restrictive diffuse/specular.
This is how 2 registry values look like after the crash during IBL bake:



BOTH values have to be set to 0 (PLEASE EXERCISE CAUTION WHILE EDITING REGISTRY!)



And obviously after the fix all opened projects look normal:


I never had time to enter this into FT, but I will at some point... 

thx for your reply 4u2ges. 

the problem i getting is when i try generate a ibl from my scene i got black images . if i do the things you show about edit registry
i will correct that ??? i believe this is comming wrong since 7.7. cause i never got problems with anterior versions to bake ibl.

i chekc my reg, and both values are on zero, i believe this is not the problem.

do you place a dummy object in the correct area you want the cam and have it selected?


.

You have to pick a right center point (an object in the scene or a dummy) (around which the 360 would evolve).
Here is an IBL baked from the default Loft Scene (2048x1024). Center point is one of the pillows on a couch.


But I am not sure if it rendered correctly. Most diffuse maps with a few exceptions did not come out right!

Plus, I cannot render 4096x2048. If I do, it would crash iClone and then I need to fix it with registry.


So the registry hack I showed, is to fix iClone after the crash. Otherwise non of the projects would render correctly.

you got same results i got , dark images. 

yep