[Home](./index.md) > [rc-js-util](./rc-js-util.md) > [IReadonlyVec4](./rc-js-util.ireadonlyvec4.md) ## IReadonlyVec4 interface [Vec4](./rc-js-util.vec4.md). **Signature:** ```typescript export interface IReadonlyVec4 extends TPickExcept>, "update" | "setX" | "setY" | "setZ" | "setW" | "copyFromBuffer" | TTypedArrayTupleMutativeMethods> ``` **Extends:** [TPickExcept](./rc-js-util.tpickexcept.md)<Readonly<[Vec4](./rc-js-util.vec4.md)<TArray>>, "update" \| "setX" \| "setY" \| "setZ" \| "setW" \| "copyFromBuffer" \| [TTypedArrayTupleMutativeMethods](./rc-js-util.ttypedarraytuplemutativemethods.md)>