Textures from a texture atalas turning black in the distance

I am making a voxel engine because I thought it would be a good way to learn Unity and I am having some troubles getting my texture atalas generated at runtime to work properly. Here's the problem:

To me, this looks like the texture atlas is being mipmaped so I tried to turn that off in my texture atlas generator. My code looks like this:

     Atalas = new Texture2D(512, 512, TextureFormat.ARGB32, false); // The false here should turn off mipmapping right?
     Rect[] rects = Atalas.PackTextures(AtalasTextures, 0, 512);
     Atalas.filterMode = FilterMode.Point;
     Atalas.wrapMode = TextureWrapMode.Clamp;

That code is still producing the issue and I don't know what else to try. I'm pretty new to Unity so sorry if this is a FAQ.