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A bug from a user. I will give the dataset to Utkarsh. (Note to self - workstation, mst..., cylinder_a_v3.0a.5.e.)

• ParaView 5.1.2, local server, Linux.
• This dataset has three vectors of interest - Q_XX, Q_YY and Q_ZZ, which are orthogonal to each other.
• Read data, all vars on, apply.
• Select one cell. I selected one on the surface, down at the bottom edge of the can. Extract Selection. Apply. Now, I have one cell to play with.
• Glyph. Vector == Q_XX, Scale Mode vector. Surprisingly, I got no vector at all. This is a bug.
• Choose incoming dataset. Split screen. Spreadsheet view. Look at Q_XX, Q_YY and Q_ZZ. Spread the Q_XX, and Q_YY, and Q_ZZ columns. Yep, they look orthogonal to me.
• Reset Session.
• Read data, all vars on, apply.
• Cell data to Point data filter. We now have the vectors at the corners of the cells.
• Glyph as above. Q_XX. Apply.
• Be sure pipeline browser is on the Cell Data to Point Data filter. Glyph as above. Q_YY. Apply.
• Be sure pipeline browser is on the Cell Data to Point Data filter. Glyph as above. Q_ZZ. Apply.

The three vectors are well behaved, and furthermore, are orthogonal.

So, with this dataset, glyphing of cell data doesn't work correctly, glyphing point data does work correctly.

Marking as important, since it misrepresents data.