Matte Option For Still Images

[nivvu]

hi...to everyone....

 

As u see Image Matte..... I draw a plane and a simple box on it.....and after i put a omnilight with vray shadows on

i get a shadow....its comon thing....(nw i save tht image in tiff format and save with the alpha channel chechbox on....)

 

As u c the Image Matte_01 As i have changed the plane in to a matt object

and checked on the shadows and affect alpha box.....

the plane is being showing when the lightcache is building....and if u c the Image Matte_02..now therz no plane but its

boundary is being get selected when i select through alphachannel.......

 

Now wat my aim is....i want only tht box and its shadow get selected through alphachannel when i select in photoshop

wat iam suppose to do.....even the plane is also getting selected though itis not

rendered and its matte options are checked on......

 

with out a base underneath the box i cant get a shadow of the box.....

if i click on the matte option, shadows and affect alpha options then the plane is also getting selected in photoshop....

now its a matter of only a plane and box....wat if there is so much of geometry on the plane.......????

 

i want to know that is there any way by which we can get the box and its shadow get selected

so tht i can incorporate tht image in to other image in photoshop......

 

hoping a soon repsonse from u experts....

 

cheeeeeeeers

 

nivas. :-)

[Stephen Thomas]

Change the box's alpha contribution to -1 in the object settings under system rollout.

[nivvu]

hi

 

thanks for the advise....

 

i have changed the alpha contribution for plane to -1 instead of 1......

 

we need to change alpha contribution for plane to -1 bcoz.....shadow of the box is going to generate on the plane.......u said to chnge the box alpha contribution to -1....i think its wrong.....

 

after changing plane alpha contribution to -1 it workd out very well....thanks a lot for the advise.....

 

cheers

nivas.

[Stephen Thomas]

hi

 

thanks for the advise....

 

i have changed the alpha contribution for plane to -1 instead of 1......

 

we need to change alpha contribution for plane to -1 bcoz.....shadow of the box is going to generate on the plane.......u said to chnge the box alpha contribution to -1....i think its wrong.....

 

after changing plane alpha contribution to -1 it workd out very well....thanks a lot for the advise.....

 

cheers

nivas.

My mistake, I meant plane! Glad its working now.

[nivvu]