Volume turns black after applying transform

Version: 4.11
Operating system: win 10

I am trying to transform a 3D volume that I made using the grayscale model maker. However, after I apply a linear transform, the model turns black.

Before:
image
After:
image

What could cause this to happen?

Thank you in advance.

You applied a transform that turned the model inside out (determinant of the matrix is negative). If you are sure that you want to apply this transform then you can use Surface Toolbox module to reorient the cells in the model (Normals / Flip normals).

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