[true]

Like the others i covert HDRI to tiff to MXI, and apply it to sphere emitter wrap around the object, but this make me wonder how can i get rid of the background now?

In vray eg. u can render hdri without showing the background, so i can't do it with maxwell now?? thanks~





10-20min each 11 samples

[Aldaryn]

http://www.maxwellrender.com/forum/viewtopic.php?t=4276

Same issue. There is no current way you can to that without post, I think. Right now, not even an alpha mask can help you, because the emitter has alpha contribution too.

Btw, really nice MXI test, almost like HDR files.

[rivoli]

Right now, not even an alpha mask can help you, because the emitter has alpha contribution too.

true, but in this case it can be sorted very easily. it only takes another pass with no background sphere (to avoid aliasing issues you may need to do the second pass with maxwell as well, but it doesn't need anything more than totally diffuse black objects this time).

[true]

Thank both of your reply. I learn a lot
And in fact, rivoli's method is working.

[rivoli]

wow, i would have expected another kind of image as a background, but this one is not bad.

[Aldaryn]

... it only takes another pass with no background sphere ...

I feel so, sooo stupid...

[Tyrone Marshall]

... it only takes another pass with no background sphere ...

I feel so, sooo stupid...

Not at all, welcome to the world of multi-pass rendering techniques!