Simple Node Question

thomas · Post by **thomas** » Fri Jan 08, 2016 3:38 pm

Hi!

I have a really simple node question that I can't seem to find a good (and elegant) solution for:

I have a black and white mapping that represents stripes on the floor. Now I want have two base color nodes (let's say for example red and blue) where the red is the background color, and I use the black and white as an alpha map to define where the blue is placed on top of the red color.

I know it must be really simple, but I'm a bit lost at the moment. Does anyone have insight on this? Thanks!

LW8000 · Post by **LW8000** » Fri Jan 08, 2016 9:48 pm

Hi Thomas

Try using a "Mixer node".

Brian

Janusz Biela · Post by **Janusz Biela** » Sat Jan 09, 2016 12:06 am

Try this:

Scene:

alpha_nodes.zip: (7.07 MiB) Downloaded 191 times

In this Node (CheckerBoard2D) by opacity you control strength of alpha:

: ScreenShot140.png (10.72 KiB) Viewed 3283 times

Also you can mix two textures in Image (1) with different blending styles (screen, multiply, additive, etc).

Fire LW VPR and play with options.

thomas · Post by **thomas** » Tue Jan 12, 2016 2:10 pm

Hi Janusz,

Thanks for the tip! It helps me to learn, but in my case, I have two "color layers", and the color constant does not have an opacity input.

I can create a GRID procedural and set the line width to 100% to create a solid color, and then I have an opacity input, but it seems like there should be a simpler way to create a solid color over another color, with an alpha channel.

www.kraytracing.com