# shz_mat4x4_3x3_inverse_unscaled

Source: https://sh4zam.com/api/matrix/shz_mat4x4_3x3_inverse_unscaled/

```c
SHZ_INLINE void shz_mat4x4_3x3_inverse_unscaled(const shz_mat4x4_t* mat4, shz_mat3x3_t* invmat3) SHZ_NOEXCEPT;
```

Extracts and inverts the top-level, unscaled 3x3 of the given 4x4 matrix.

## Parameters

| Name | Type | Description |
| --- | --- | --- |
| `mat4` | `const shz_mat4x4_t *` |  |
| `invmat3` | `shz_mat3x3_t *` |  |

## Returns

Nothing (`void`).

## Naming and requirements

- `shz_mat4x4_t` and `shz_mat2x2_t` arguments must be 8-byte aligned. Unaligned data goes through the `float[16]` parameters of the `_unaligned` routines.

## Availability

- **C++ equivalent:** none (call the C function from C++)
- **Type-generic form:** none
- **Back-ends:** SH4: shared C implementation · SW: portable C · SPU: shared C implementation
- **Defined in:** [`sh4zam/shz_matrix.h:333`](https://github.com/gyrovorbis/sh4zam/blob/ba1e30c88d49df0311870b229e1dd860ef26c477/include/sh4zam/shz_matrix.h#L333)
- **Module:** [Matrix](https://sh4zam.com/api/matrix/), section "Getting"