@chon said:

So, on your image, you've got to represent both north AND south hemispheres with the horizon on the middle of that image

i understood what you said...
but why i should do that? I mean what happens if don't do that?
and how it helps me too have a tile texture in the background?

@andybot said:

try a repeat of 0.25

this is a 0.25 repeat... as you can see it is still one picture in the background!

@chon said:

in the Texture Editor "repeat" option

yes but it is not working for me:
it is a reflect able sphere I rendered for you to see
I attached original picture and rendered pictures with 1, 5 ,20 and 100 repeat both in horizontal and vertical directions.
as you see when repeat number increases it seams picture goes to be zoomed more and more in the background!
why I can not see at least one picture in complete size in the background? while I want to see pictures tiled in the background!

hi everyone
I chose a picture for BG in vray option window
does anybody knows how i can reduce the size of image and make it repeat in the back ground?

@nomeradona said:

just follow what andybot said.

thank you
yes it is working

thanks guys
I just watched the video
and chose default.visopt with a little changes that was recommended in the video
and contrast is good now

thank for responses
I will watch the video
and of course latest versions are necessary...
I use: SketchUp 8.0.3117 Pro + V-Ray 1.48.91 td
and fast-preview-studio.visopt
I used materials but this picture is from primary designing
and it is a sketchup rendering not a vray rendering
(in order to decrease size of the file and time of rendering)

don't you think I should set an omni light somewhere (hidden from the cameras line of sight) under the awnings... or make upper surface of the awnings translucent... or something like that in order to increase the light under the awnings?

by the way if the latest version of the design renders are helpful please tell me to attach them.

Pleas look at my model...
it suppose to be a grand bazaar...
and these are awnings...
I want too make a day light scene
when I render with sunlight objects and ground under awning are too dark and other places are too shiny!
I used:
sunlight intensity 1
GI color 1
physical camera shutter speed 300

I tried increasing and decreasing of sunlight, but contrast between inside and outside of awnings is huge!
what should I do?

Thanks

@devran said:

rightclick on the alpha channel and save as a new picture... thats all

I tried but I could not...
please someone explain more?
(right clicking on alpha channel in Photoshop gave me 2 options: "duplicate channel" and "save channel"... where I can save alpha channel as png?)