User side:
* Preview for DynamicPaint should keep the same behavior (for now). Weight preview should be somawhat quicker, though.
* Preview for WeightVG modifiers is only active in WeightPaint mode, and if the affected vgroup is the active one.
* Last active preview modifier in stack wins!
Note: that modifier preview topic is yet to be further refined, quite raw/incomplete for now.
Dev side:
* In draw code, renamed DRAW_DYNAMIC_PAINT_PREVIEW flag to DRAW_MODIFIERS_PREVIEW
* Removed use of MOD_DPAINT_PREVIEW_READY in DynamicPaint code (seems unecessary, and if it was, should be of more general scope).
* Added eModifierTypeFlag_UsesPreview to ModifierTypeFlag, for modifiers that can generate some preview data.
* Added three new modifier funcs, to handle preview modifiers in draw code / mod stack.
* For weights preview: added the generic DM_update_weight_mcol func, which can update WEIGHT_MCOL layer with either a given array of weights (currently used by DynamicPaint only), or from current active vgroup(s).
So now, draw code is fully generic (i.e. no more modifier-type checking in it). Mod stack code is generic to some extent, but will need more work.
Problem was, if no vertices were ever added to one of the obect's vgroups, there is no CD_DEFORMVERT layer, even though there might be several valid vgroup indices... Odd no one noticed that earlier.
Many thanks to miikah for finding that bug!
- in the case of deform modifiers this is very safe (assuming the mods themselves dont need tessface data), since the DM is freed right after, so this is an easy speedup.
- in the case of bevel and split edge modifiers this should still work out fine since mods that need tessface data will generate it.
Also, allow applying to obdata those modifiers, even with shapekeys, but do not allow applying them *as* shapekey (as shapekeys do not have CD layers).
Fix [#29636] Vertex Weight Mix modifier "apply" button don't work.
Note: applying whit shape keys currently always uses base shape, not current one (for apply to obdata as well as apply to shapekey), but this is another topic...
Quite oddly, for Proximity mod, this increases the performances of the apply func (about 20-25%, e.g. from 0.04 to 0.03 sec), but decreases the global framerate (e.g. in TEST_5 scene of testing file, I lose about 7%, from 4.6 to 4.3fps (open ATI driver)...).
* Added some RNA tooltips, now that they are supported by dropdown lists.
* Fixed some RNA num properties UI steps.
* Fixed a memory leak in Proximity modifier (when dm of "target" object had to be created, it wasn’t freed...).
* Added an optional array of MDeformModifier pointers, to avoid another search based on defgrp_idx.
* Split out "add/remove verts from vgroup" functions, preparing their move to deform.c (if their current form is validated!).
- use 'const float *' and array size in some function declarations.
- replace macros for BLI_math functions INPF, VECCOPY, VECADD etc.
- remove unused VertRen.clip struct member.
- remove static squared_dist() from 2 files, replace with BLI_math function len_squared_v3v3().
- use vertex arrays for drawing clipping background in the 3D viewport.
*Updated UI code (replaced “row columns” by splits ;) ).
*Clamped global influence to [0.0, 1.0] range!
*Added/edited some tooltips for Proximity.
*Proximity distance mapping can now be reversed by entering Lowest Dist > Highest Dist.
*Moved mapping before masking in Proximity, much more sensible this way!
