---
title: matrix
framework: spatial
role: symbol
role_heading: Instance Property
path: spatial/affinetransform3d/matrix
---

# matrix

The affine transform’s underlying matrix.

## Declaration

```swift
var matrix: simd_double4x3
```

## See Also

### Checking characteristics

- [Dimension3DSet](spatial/dimension3dset.md)
- [isInvertible](spatial/affinetransform3d/isinvertible.md)
- [isUniform(overDimensions:)](spatial/affinetransform3d/isuniform(overdimensions:).md)
- [matrix3x3](spatial/affinetransform3d/matrix3x3.md)
- [matrix4x4](spatial/affinetransform3d/matrix4x4.md)