in render setup menu , i choose selected (on area to render)but i failed render for selected object render.i just want to get render my object without background (i can hide other object but i didnt mean that.i want to get transparent background(such as .png s )so i can send my object render to ps without decoupe .
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1- process alpha option in the rendering panel
2- you can't render selected in fstorm -
yea i try but looks all areas white . did i something wrong?even i succes ,i have about 4000 frames for a short animation. masking 1 by 1 s realy boring for all frames...Comment
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you did not check the process alpha
it's under the gi clamp
if you have glare enabled you'll get weird halos in the buffer but thei'll disappear when saving out pngs tiff exr or whatever supports alpha channels
you can output png sequence with the channel embedded
if you want objs to clip your subject visibility while retaining the alpha channel you can give a go to this method:
obj A = is the battery pack or the subject you want to render selected (the clipped obj)
obj B = the box you don't want to appear (the clipper obj)
use the process alpha option in the renderer panel
make B a matte material, remove bump, specular and transparency (if you don't do this you'll have problems with the clipper being somehow visible in alpha) remove cast shadow from the obj properties
in this way you have workaround to get the effect you want as render selected
reder, save, composite
let me know
cdb-Comment
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thnx solved...i am blind sorry
i check process alpha than i just grouped objects which i want for maskin 
added the result is ok even glare is open.
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