[Home](./index.md) > [rc-js-util](./rc-js-util.md) > [IReadonlyMat3](./rc-js-util.ireadonlymat3.md) ## IReadonlyMat3 interface [Mat3](./rc-js-util.mat3.md). **Signature:** ```typescript export interface IReadonlyMat3 extends TPickExcept>, "setValueAt" | "setRow" | "copyFromBuffer" | TTypedArrayTupleMutativeMethods> ``` **Extends:** [TPickExcept](./rc-js-util.tpickexcept.md)<Readonly<[Mat3](./rc-js-util.mat3.md)<TArray>>, "setValueAt" \| "setRow" \| "copyFromBuffer" \| [TTypedArrayTupleMutativeMethods](./rc-js-util.ttypedarraytuplemutativemethods.md)>