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Fixed bug #8243, sculpt mode crash
Increased amount of memory allocated for doing smooth stroke. Should ensure there's enough room to store result of subdividing the stroke.
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Cleaned up some old parts of sculpt. Got rid of the old EditData struct in favor of two new "brush action" structures, which split the symmetry data out from everything else. Cleaned up various names and such as well. There should be no user-visible changes.
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Fixed bad level calls in sculptmode.
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Refactored and improved sculptmode-stroke.c.
* With smooth stroke on, the Spacing value is now taken into account (if zero, the default value of two is still used)
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Added a new input control that smooths the brush stroke.
This option controlled by the menu item Sculpt>Input Control>Smooth Stroke. When enabled, the brush has a delayed effect on the model; a green line is drawn to indicate the smoothed path of the stroke. After ~200 pixels, the first half of the stroke will be applied to the model; the process then repeats, with a new segment of the stroke being applied to the model after every 200 pixels. On mouse up, any remaining portion of the stroke will be applied.
Other changes:
* Added a flags field to SculptData; currently only used for smooth stroke but other flags can be moved into it
* Moved the damaged_rects/verts into SculptSession
* Simplified brush application by moving init_editdata into do_symmetrical_brush_actions
* Removed Averaging from sculpt Input menu; smooth stroke should take its place
TODO:
* Fix display of the smooth line in Partial Redraw mode
* Make the smoothing and delay factors adjustable
* Optimize the stroke application (currently using the old 'dot' style of applying the brush)
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