Extrusion Along Incorrect Local Axes #48481
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Reference: blender/blender#48481
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The enclosed
.blend
file Extrusion Axes Example.blend helps to illustrate a long-standing inconsistency in the behaviour of the Extrude function. For clarity, I have assigned colour-coded materials to the faces of the default cube: red for those perpendicular to the X-axis, green for those perpendicular to the Y-axis, and blue for those perpendicular to the Z-axis.Feel free to verify that the object has no net object transformation applied. In particular, the local and global X, Y and Z coordinate axes correspond.
TAB into Edit mode. Note that you are already in face-select mode. Try the following:
All these work fine. Now try the following:
For me, the only one that works properly is the last one. The first one moves along the Y- rather than the X- axis, and the second one moves along the Z- rather than the Y-axis.
However, the following do work:
Do you see the inconsistency?
Changed status to: 'Open'
Added subscriber: @ldo
Added subscriber: @cheleb
Hi @ldo,
this is because the extrude operator automatically sets the second transform orientation (double tapping) to normal mode, which is a sensible thing to do for extrusions. You can verify this by looking at the status message on the left in the viewport header after double tapping an axis key.
It says something along the lines of:
The reason it works after pressing ESC and double tapping an axis is that you are now doing a standard translation, which operates under the following rules:
exception to the rule above is when the dropdown is set to global space - the second space in this case is set to local
Also see the first paragraph in under Transform Orientations in the manual.
So, not a bug. :)
Why would this apply to X and Y, but not Z?
Here is something else to try:
So this time the message is consistent, but the behaviour still is not.
Because the extrusion operator is already locked in Z (normal space) when you press the EKEY. Pressing Z again releases the Z constraint. Again, see the status message in the header.
Works exactly as it says for me.
EKEY SKEY SHIFT-XKEY SHIFT-XKEY for example says it is locking the scale of the X axis in normal space. So the scaling can only happen on the Y and Z axis in normal space. And because the Pivot Point lies exactly on the the center of the selected face, scaling the Z axis doesn't change anything. As a result you only see change of scale on the Y axis in normal space.
When you change the Pivot Point to 3D cursor before you press those keys, you see that the scaling now also affects the Z axis in normal space.
So why does the Z axis behave differently from the others?
EKEY SKEY SHIFT-ZKEY SHIFT-ZKEY says it is locking the scale to the Z axis in normal space. So why does it not scale along Z in normal space?
OK, I think I’m beginning to understand now. Regardless of your choice of transform orientation, EKEY always starts out in Normal transformation mode. If you want your choice of transform orientation, you must ESC and then transform the extruded vertices in the usual way.
Changed status from 'Open' to: 'Archived'
OK, I concede this is a feature, not a bug.