Ton Roosendaal
c648e790be
When Modifiers are used in Edit Mode to show the deformed result for editing, all actual coordinates Blender works with are still the ones from the original Cage. You can notice that with the Transform Widget or helper lines while transforming. Even worse, the actual transformations still happened on the original Cage as well, making it very hard to edit. That caused the feature to be named "CrazySpace" (baptized by Andy, afaik?). This commit calculates the deformation transformation per vertex, and inverse corrects it, so it's more intuitive editing this way. Unfortunately all the deformation features of Blender don't use matrices for defining deform, so the existing code cannot be re-used to retrieve the correct deformation matrix per vertex. The solution I found is based on calculating per face the transformation based on its first 3 vertices, and store this transformation averaged in the face's vertices. The solution can also only work on entire faces, because the full deform can only be retrieved using 3 vertices. (using 2 vertices will miss edge- aligned rotation, using 1 vertex can only retrieve translation). By deriving the deformations per face, small errors will still happen, especially on very low-poly Meshes with extreme deformations. The only alternative I know now, is providing each vertex in a mesh with 2 extreme small tangent vectors, which get deformed using the existing code as well. That will mess up the existing deformation code too much though, this solution has the benefit it works with each deform we can up with later too. Last note about CrazySpace: it can only be used to tweak Meshes. Do not even try to add vertices, extrude, or duplicate. Probably we should disable this... but preventing user errors isn't always power-user-friendly, eh. :)
219 lines
8.3 KiB
C++
219 lines
8.3 KiB
C++
/**
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*
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* $Id$
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*
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* ***** BEGIN GPL/BL DUAL LICENSE BLOCK *****
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version. The Blender
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* Foundation also sells licenses for use in proprietary software under
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* the Blender License. See http://www.blender.org/BL/ for information
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* about this.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software Foundation,
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* Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*
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* The Original Code is Copyright (C) 2001-2002 by NaN Holding BV.
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* All rights reserved.
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*
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* The Original Code is: all of this file.
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*
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* Contributor(s): none yet.
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*
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* ***** END GPL/BL DUAL LICENSE BLOCK *****
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*/
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#ifndef BKE_MODIFIER_H
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#define BKE_MODIFIER_H
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struct DerivedMesh;
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struct DagForest;
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struct DagNode;
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struct Object;
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struct ListBase;
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typedef enum {
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/* Should not be used, only for None modifier type */
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eModifierTypeType_None,
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/* Modifier only does deformation, implies that modifier
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* type should have a valid deformVerts function. OnlyDeform
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* style modifiers implicitly accept either mesh or CV
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* input but should still declare flags appropriately.
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*/
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eModifierTypeType_OnlyDeform,
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eModifierTypeType_Constructive,
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eModifierTypeType_Nonconstructive,
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} ModifierTypeType;
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typedef enum {
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eModifierTypeFlag_AcceptsMesh = (1<<0),
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eModifierTypeFlag_AcceptsCVs = (1<<1),
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eModifierTypeFlag_SupportsMapping = (1<<2),
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eModifierTypeFlag_SupportsEditmode = (1<<3),
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/* For modifiers that support editmode this determines if the
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* modifier should be enabled by default in editmode. This should
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* only be used by modifiers that are relatively speedy and
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* also generally used in editmode, otherwise let the user enable
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* it by hand.
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*/
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eModifierTypeFlag_EnableInEditmode = (1<<4),
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/* For modifiers that require original data and so cannot
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* be placed after any non-deformative modifier.
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*/
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eModifierTypeFlag_RequiresOriginalData = (1<<5),
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} ModifierTypeFlag;
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typedef struct ModifierTypeInfo {
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/* The user visible name for this modifier */
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char name[32];
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/* The DNA struct name for the modifier data type, used to
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* write the DNA data out.
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*/
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char structName[32];
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/* The size of the modifier data type, used by allocation. */
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int structSize;
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ModifierTypeType type;
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ModifierTypeFlag flags;
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/* Initialize new instance data for this modifier type, this function
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* should set modifier variables to their default values.
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*
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* This function is optional.
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*/
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void (*initData)(ModifierData *md);
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/* Copy instance data for this modifier type. Should copy all user
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* level settings to the target modifier.
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*/
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void (*copyData)(ModifierData *md, ModifierData *target);
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/* Free internal modifier data variables, this function should
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* not free the _md_ variable itself.
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*
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* This function is optional.
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*/
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void (*freeData)(ModifierData *md);
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/* Return a boolean value indicating if this modifier is able to be calculated
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* based on the modifier data. This is *not* regarding the md->flag, that is
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* tested by the system, this is just if the data validates (for example, a
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* lattice will return false if the lattice object is not defined).
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*
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* This function is optional (assumes never disabled if not present).
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*/
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int (*isDisabled)(ModifierData *md);
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/* Add the appropriate relations to the DEP graph depending on the modifier
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* data.
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*
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* This function is optional.
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*/
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void (*updateDepgraph)(ModifierData *md, struct DagForest *forest, struct Object *ob, struct DagNode *obNode);
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/* Should return true if the modifier needs to be recalculated on time changes.
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*
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* This function is optional (assumes false if not present).
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*/
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int (*dependsOnTime)(ModifierData *md);
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/* Should call the given _walk_ function on with a pointer to each Object pointer
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* that the modifier data stores. This is used for linking on file load and for
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* unlinking objects or forwarding object references.
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*
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* This function is optional.
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*/
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void (*foreachObjectLink)(ModifierData *md, struct Object *ob, void (*walk)(void *userData, Object *ob, Object **obpoin), void *userData);
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/* Only for deform types, should apply the deformation
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* to the given vertex array. If the deformer requires information from
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* the object it can obtain it from the _derivedData_ argument if non-NULL,
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* and otherwise the _ob_ argument.
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*/
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void (*deformVerts)(ModifierData *md, struct Object *ob, void *derivedData, float (*vertexCos)[3], int numVerts);
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/* Like deformVerts but called during editmode (for supporting modifiers) */
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void (*deformVertsEM)(ModifierData *md, struct Object *ob, void *editData, void *derivedData, float (*vertexCos)[3], int numVerts);
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/* For non-deform types: apply the modifier and return a new derived
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* data object (type is dependent on object type). If the _derivedData_
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* argument is non-NULL then the modifier should read the object data
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* from the derived object instead of the actual object data.
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*
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* If the _vertexCos_ argument is non-NULL then the modifier should read
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* the vertex coordinates from that (even if _derivedData_ is non-NULL).
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* The length of the _vertexCos_ array is either the number of verts in
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* the derived object (if non-NULL) or otherwise the number of verts in
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* the original object.
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*
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* The _useRenderParams_ indicates if the modifier is being applied in
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* the service of the renderer which may alter quality settings.
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*
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* The _isFinalCalc_ parameter indicates if the modifier is being calculated
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* for a final result or for something temporary (like orcos). This is a hack
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* at the moment, it is meant so subsurf can know if it is safe to reuse its
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* internal cache.
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*
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* The modifier *MAY NOT* reuse or release the _derivedData_ argument
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* if non-NULL. The modifier *MAY NOT* share the _vertexCos_ argument.
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*/
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void *(*applyModifier)(ModifierData *md, struct Object *ob, void *derivedData, float (*vertexCos)[3], int useRenderParams, int isFinalCalc);
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/* Like applyModifier but called during editmode (for supporting modifiers).
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*
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* The derived object that is returned must support the operations that are expected
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* from editmode objects. The same qualifications regarding _derivedData_ and _vertexCos_
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* apply as for applyModifier.
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*/
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void *(*applyModifierEM)(ModifierData *md, struct Object *ob, void *editData, void *derivedData, float (*vertexCos)[3]);
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} ModifierTypeInfo;
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ModifierTypeInfo* modifierType_getInfo (ModifierType type);
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/* Modifier utility calls, do call through type pointer and return
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* default values if pointer is optional.
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*/
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ModifierData* modifier_new (int type);
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void modifier_free (ModifierData *md);
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void modifier_copyData (ModifierData *md, ModifierData *target);
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int modifier_dependsOnTime (ModifierData *md);
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int modifier_supportsMapping (ModifierData *md);
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int modifier_couldBeCage (ModifierData *md);
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void modifier_setError (ModifierData *md, char *format, ...);
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void modifiers_foreachObjectLink (struct Object *ob, void (*walk)(void *userData, struct Object *ob, struct Object **obpoin), void *userData);
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ModifierData* modifiers_findByType (struct Object *ob, ModifierType type);
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void modifiers_clearErrors (struct Object *ob);
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int modifiers_getCageIndex (struct Object *ob, int *lastPossibleCageIndex_r);
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int modifiers_isSoftbodyEnabled (struct Object *ob);
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struct Object* modifiers_isDeformedByArmature(struct Object *ob);
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int modifiers_isDeformed (struct Object *ob);
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ModifierData* modifiers_getVirtualModifierList (struct Object *ob);
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/* Modifier utility calls, do call through type pointer and return
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* default values if pointer is optional.
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*/
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struct ModifierData* modifier_new (int type);
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void modifier_free (struct ModifierData *md);
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int modifier_dependsOnTime (struct ModifierData *md);
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#endif
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