# IrisGenerator > Represents a composite generator of noise gens ```json { "offsetX": 0, "offsetZ": 0, "interpolationFunction": "BICUBIC", "seed": 1, "composite": [], "interpolationScale": 7, "zoom": 1, "opacity": 1 } ``` ## zoom > The zoom or frequency. ## opacity > The opacity, essentially a multiplier on the output. ## offsetX > The offset to shift this noise x ## offsetZ > The offset to shift this noise z ## seed > The seed for this generator ## interpolationFunction > The interpolation method when two biomes use different heights but this same generator ## interpolationScale > The interpolation distance scale (blocks) when two biomes use different heights but this same generator ## composite > The list of noise gens this gen contains.