Change Details

{F546903} **System Information** Windows 10 64 bit, NVidia GTX 950m **Blender Version** 2.78c **Short description of error** Impossible to set precise dimensions to object when curve modifier is applied **Exact steps for others to reproduce the error** Attached file was created following the steps outlined below. You may jump to step (13) for the problem. (1) Create a new blender file. (2) Do *not* delete the default cube. From now on, it is best if you switch to the top ortho view and press Z to enable wireframe view. (3) Click to enable the "Snap during transform" button (magnet icon), to make sure any transformations are snapped to the grid. (4) Select and scale the default cube along the X axis (e.g. by pressing S, then X and then typing 10 followed by ENTER), so that it is extended to 20 Blender units along the X axis. (5) Insert 9 cuts (edge loops) perpendicular to the X axis in the extended cube object, by selecting the cube, TABing into edit mode, pressing CTRL-R, X and then 9 and ENTER. This is done to allow it to be deformed later on. Exit edit more. (6) Make sure the 3D cursor is at the origin of the cube object, by selecting the cube, pressing SHIFT-S, and choosing Cursor to selected. (7) Add a path curve, which by default appears as a small straight line along the X axis. (8) Select the path curve, and press S, X and then 5 followed by ENTER, to scale it 5 times along the X axis, so that it has the same length (20 Blender units) as the extended cube object. (9) Make sure the 3D cursor is at the (0,0,0) origin point. (10) Select the cube, press CTRL-SHIFT-ALT-C, and select Origin to 3D Cursor, to make sure the origin of the cube is at (0,0,0) point. (11) Select the path curve, press CTRL-SHIFT-ALT-C and select Origin to 3D Cursor, to be sure that the origin of the path coincides with the origin of the cube object, which is at (0,0,0). (12) Add a curve modifier to the cube, select the path curve as the object, and make sure that the X is set as the axis of transformation. (13) If you now deform the path (as I have done in the blend-file), you will notice that the cube object (with its interim edge loops) deforms along the path as well, but its width (y-axis) becomes equal to the width of the deformed path object (9.345 in my blend-file), instead of remaining at 2 units. If you set the width of the deformed cube object at 2 units, it looks better, but if you TAB into edit mode, you will see that the cube object has become very narrow (about 0.4 Blender units). All in all, it does not appear to be possible to maintain the cube at its original 2 units of width (Y-axis), while extending it along the curved path.

{F546903} **System Information** Windows 10 64 bit, NVidia GTX 950m **Blender Version** 2.78c **Short description of error** Impossible to set precise dimensions to object when curve modifier is applied **Exact steps for others to reproduce the error** Attached file was created following the steps outlined below. You may jump to step (13) for the problem. (1) Create a new blender file. (2) Do *not* delete the default cube. From now on, it is best if you switch to the top ortho view and press Z to enable wireframe view. (3) Click to enable the "Snap during transform" button (magnet icon), to make sure any transformations are snapped to the grid. (4) Select and scale the default cube along the X axis (e.g. by pressing S, then X and then typing 10 followed by ENTER), so that it is extended to 20 Blender units along the X axis. (5) Insert 9 cuts (edge loops) perpendicular to the X axis in the extended cube object, by selecting the cube, TABing into edit mode, pressing CTRL-R, X and then 9 and ENTER. This is done to allow it to be deformed later on. Exit edit more. (6) Make sure the 3D cursor is at the origin of the cube object, by selecting the cube, pressing SHIFT-S, and choosing Cursor to selected. (7) Add a path curve, which by default appears as a small straight line along the X axis. (8) Select the path curve, and press S, X and then 5 followed by ENTER, to scale it 5 times along the X axis, so that it has the same length (20 Blender units) as the extended cube object. (9) Make sure the 3D cursor is at the (0,0,0) origin point. (10) Select the cube, press CTRL-SHIFT-ALT-C, and select Origin to 3D Cursor, to make sure the origin of the cube is at (0,0,0) point. (11) Select the path curve, press CTRL-SHIFT-ALT-C and select Origin to 3D Cursor, to be sure that the origin of the path coincides with the origin of the cube object, which is at (0,0,0). (12) Add a curve modifier to the cube, select the path curve as the object, and make sure that the X is set as the axis of transformation. (13) If you now deform the path (as I have done in the blend-file), you will notice that the cube object (with its interim edge loops) deforms along the path as well, but its width (y-axis) becomes equal to the width of the deformed path object (9.345 in my blend-file), instead of remaining at 2 units. If you set the width of the deformed cube object at 2 units, it looks better, but if you TAB into edit mode, you will see that the cube object has become very narrow (about 0.4 Blender units). This behavior may be partially amended if "Display Modifier in Edit Mode" and "Adjust Edit Cage to Modifier Results" are turned on. Nevertheless, it does not appear to be possible to maintain the cube at its original 2 units of width (Y-axis), while extending it along the curved path. Another issue I have submitted, [[ https://developer.blender.org/T51022 | https://developer.blender.org/T51022 ]], shows that such sizing/dimensioning programs are even more of a problem when a curve modifier is used after an array modifier.

{F546903} **System Information** Windows 10 64 bit, NVidia GTX 950m **Blender Version** 2.78c **Short description of error** Impossible to set precise dimensions to object when curve modifier is applied **Exact steps for others to reproduce the error** Attached file was created following the steps outlined below. You may jump to step (13) for the problem. (1) Create a new blender file. (2) Do *not* delete the default cube. From now on, it is best if you switch to the top ortho view and press Z to enable wireframe view. (3) Click to enable the "Snap during transform" button (magnet icon), to make sure any transformations are snapped to the grid. (4) Select and scale the default cube along the X axis (e.g. by pressing S, then X and then typing 10 followed by ENTER), so that it is extended to 20 Blender units along the X axis. (5) Insert 9 cuts (edge loops) perpendicular to the X axis in the extended cube object, by selecting the cube, TABing into edit mode, pressing CTRL-R, X and then 9 and ENTER. This is done to allow it to be deformed later on. Exit edit more. (6) Make sure the 3D cursor is at the origin of the cube object, by selecting the cube, pressing SHIFT-S, and choosing Cursor to selected. (7) Add a path curve, which by default appears as a small straight line along the X axis. (8) Select the path curve, and press S, X and then 5 followed by ENTER, to scale it 5 times along the X axis, so that it has the same length (20 Blender units) as the extended cube object. (9) Make sure the 3D cursor is at the (0,0,0) origin point. (10) Select the cube, press CTRL-SHIFT-ALT-C, and select Origin to 3D Cursor, to make sure the origin of the cube is at (0,0,0) point. (11) Select the path curve, press CTRL-SHIFT-ALT-C and select Origin to 3D Cursor, to be sure that the origin of the path coincides with the origin of the cube object, which is at (0,0,0). (12) Add a curve modifier to the cube, select the path curve as the object, and make sure that the X is set as the axis of transformation. (13) If you now deform the path (as I have done in the blend-file), you will notice that the cube object (with its interim edge loops) deforms along the path as well, but its width (y-axis) becomes equal to the width of the deformed path object (9.345 in my blend-file), instead of remaining at 2 units. If you set the width of the deformed cube object at 2 units, it looks better, but if you TAB into edit mode, you will see that the cube object has become very narrow (about 0.4 Blender units). All in allThis behavior may be partially amended if "Display Modifier in Edit Mode" and "Adjust Edit Cage to Modifier Results" are turned on. Nevertheless, it does not appear to be possible to maintain the cube at its original 2 units of width (Y-axis), while extending it along the curved path. Another issue I have submitted, [[ https://developer.blender.org/T51022 | https://developer.blender.org/T51022 ]], shows that such sizing/dimensioning programs are even more of a problem when a curve modifier is used after an array modifier.