[Home](./index.md) > [rc-js-util](./rc-js-util.md) > [IReadonlyMat4](./rc-js-util.ireadonlymat4.md) ## IReadonlyMat4 interface [Mat4](./rc-js-util.mat4.md). **Signature:** ```typescript export interface IReadonlyMat4 extends TPickExcept>, "setValueAt" | "setRow" | "copyFromBuffer" | TTypedArrayTupleMutativeMethods> ``` **Extends:** [TPickExcept](./rc-js-util.tpickexcept.md)<Readonly<[Mat4](./rc-js-util.mat4.md)<TArray>>, "setValueAt" \| "setRow" \| "copyFromBuffer" \| [TTypedArrayTupleMutativeMethods](./rc-js-util.ttypedarraytuplemutativemethods.md)>