If/else Expression

[user_deleted]

Hi im still new to expressions and i want to use the if /else expression but i dont quite understand the manual on how to use it, what im after is a general explanation and also how i can use this to round numbers up i.e if value is over 0.5 make it 1 else make it 0.

hope someone can help as i can see this expression would be very useful to know.

Cheers

Canwood

[user_deleted]

there are lots of ways to do this.

Brightness1.value<.5?1:0
this on is} if Brightness1.value is less than .5 then 1 other wise 0

abs(Brightness1.value?1:0)
this one takes the absolute value of the Brightness1.value and makes it one other wise it is 0
so a value of .001 would be 1 and 0 is always 0

Hope this helps a little
Mr. Brian D. Williams

[user_deleted]

thanks brian thats exactly what im after

[user_deleted]

I too, am trying to set an expression in a mix node from the width of the fileIn node but am having no luck. My expression reads

width>1280?100:0

I'm getting no error messages but the mix value does not change when the fileIn is switched with 1280 width image.

Any help would be appreciated.

[user_deleted]

Nevermind. Figured it out.

First create a resize node in the tree directly after the file in node and call it conditional. This just reads the size in our expression so there is nothing more to do with that. Then, our tree branches off in 2 directions. The first one has no adjustments, the second branch has our adjustments. Bring them together with a mix node and in the percent value, past in the expression "conditional.xSize==640?100:0".

What this does is if the file size is 640, set the mix percent to 100 which uses one side of the branch, else set the mix percent to 0 and use the other side of the branch.

[user_deleted]

depending on what you want to do, you might be better with a Select node, and use branch 1 or 2 depending on the condition.
++ chris