Mask from Math in Material Editor

picnic

I want to create a mask in my material that is generated from maths rather than a texture.
I want to be able to create a simple white square in a particular coordinate to use as a lerp mask but can't work out how or if it's even possible.
The closest math I've seen is from taking sprites out of a flipbook texture however this is kind of the reverse of what I want to do.

Any ideas would be great!:)

radiancef0rge

I have used in the past a texture coordinate and a floor node. With add and multiply you can arrange it to a specific location

picnic

This is the solution I built:



Thanks to radiancef0rge for the assist!
If anyone can improve on it or comment please do so.

radiancef0rge

Yup thats exactly how I did it, then add an integer to move it around

Vailias

another option in just nodes would be 2 if nodes, a float 2 for the corner of the square and a float 1 or float 2 for side width(use float 2 if you want rectangles), along with a texcoords.
If texcoords > or = to cornerCoord output 1 else output 0
If texcoords < or = to cornerCoord + sideWidth output 1 else output 0
multiply if's together.

radiancef0rge

oh cool idea that didnt occur to me

mkalt0235

Fyi, there's a offical page on creating masks from maths:

http://udn.epicgames.com/Three/MaterialMasks.html

Can come in handy.