Changing matrix values for position in 3D space

Hello,
I'm using noise to position multiple instances of two different shapes in 3D space. In Gen I'm sorting the noise based on it being greater than or less than 0.5 so I have two black and white matrices which are then multiplied by normalised coordinates to get the position values. As there are a number of cells that have a value of 0 in each position matrix, a lot of the shapes are positioned at 0,0.

Is there a way to only pass values greater than 0 to the jit.gl.multiple objects in my patch?

I hope this all makes sense,

Thank you!