The V-Ray Matrix is a Math node that allows you to set a transformation matrix for texture coordinates. When a texture matrix is applied, all texture coordinates are transformed through it. The supported transformations are: rotate and scale.

UI Path: ||V-Ray Node Editor|| > Shader > Math > V-Ray Matrix

UI Path: ||V-Ray Node Editor|| > Object > Math > V-Ray Matrix

UI Path: ||V-Ray Node Editor|| > World > Math > V-Ray Matrix

This node's properties can be found in the Node menu of the right-side panel of the V-Ray Node Editor or on the node itself.

Invert – Inverts the values of the Matrix.

Rotation – Rotates the texture pattern in the X, Y, and Z axes. A value of 0 leaves the element unchanged on that axis.

Scale – scales the texture pattern in the X, Y, and Z axes. A value of 0 leaves the element unchanged on that axis.