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== Constraints - Geometry Targets ==

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It is now possible to use the geometry of Meshes and/or Lattices as the target of a constraint. All you need to do, is to create a new Vertex-Group and assign all the points that you wish to use as the target, then type that name into the VG: field for the relevant constraints.

One of the cases where this is beneficial is when you need to copy the location of a vertex. Now you don't need to make extra vertex-parents for that.

Additional Notes:
* The code takes the average of the locations of the nominated vertices, and puts that in world-space for constraint solving (and regular space-conversion stuff).
* Currently, rotation and scaling of points is not taken into account. The rotation/scaling used is from the object's matrix. Hopefully, this will only be a temporary problem (will be fixed soon)
This commit is contained in:
Joshua Leung 2007-08-17 11:23:48 +00:00
parent 4d884c0fbf
commit 400d77bbe2
4 changed files with 205 additions and 17 deletions
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1
source/blender/blenkernel/BKE_deform.h
View File

@ -46,6 +46,7 @@ void copy_defgroups (struct ListBase *lb1, struct ListBase *lb2);
struct bDeformGroup *copy_defgroup (struct bDeformGroup *ingroup);
struct bDeformGroup *get_named_vertexgroup (Object *ob, char *name);
int get_defgroup_num (struct Object *ob, struct bDeformGroup *dg);
int get_named_vertexgroup_num (Object *ob, char *name);
void unique_vertexgroup_name (struct bDeformGroup *dg, struct Object *ob);
#endif

148
source/blender/blenkernel/intern/constraint.c
View File

@ -45,6 +45,8 @@
#include "DNA_object_types.h"
#include "DNA_action_types.h"
#include "DNA_curve_types.h"
#include "DNA_meshdata_types.h"
#include "DNA_lattice_types.h"
#include "DNA_scene_types.h"
#include "BKE_utildefines.h"
@ -54,12 +56,15 @@
#include "BKE_blender.h"
#include "BKE_constraint.h"
#include "BKE_displist.h"
#include "BKE_deform.h"
#include "BKE_DerivedMesh.h"
#include "BKE_object.h"
#include "BKE_ipo.h"
#include "BKE_global.h"
#include "BKE_library.h"
#include "BKE_idprop.h"
#include "BPY_extern.h"
#include "blendef.h"
@ -1106,9 +1111,111 @@ void constraint_mat_convertspace (Object *ob, bPoseChannel *pchan, float mat[][4
/* ------------------------------- Target ---------------------------- */
/* function that sets the given matrix based on given vertex group in mesh */
static void contarget_get_mesh_mat (Object *ob, char *substring, float mat[][4])
{
DerivedMesh *dm = (DerivedMesh *)ob->derivedFinal;
float vec[3] = {0.0f, 0.0f, 0.0f}, tvec[3];
int dgroup;
/* initialize target matrix using target matrix */
Mat4CpyMat4(mat, ob->obmat);
/* get index of vertex group */
dgroup = get_named_vertexgroup_num(ob, substring);
if (dgroup < 0) return;
/* only continue if there's a valid DerivedMesh */
if (dm) {
MDeformVert *dvert = dm->getVertDataArray(dm, CD_MDEFORMVERT);
int *index = (int *)dm->getVertDataArray(dm, CD_ORIGINDEX);
int numVerts = dm->getNumVerts(dm);
int i, j, count = 0;
float co[3];
/* get the average of all verts with that are in the vertex-group */
for (i = 0; i < numVerts; i++, index++) {
for (j = 0; j < dvert[i].totweight; j++) {
/* does this vertex belong to nominated vertex group? */
if (dvert[i].dw[j].def_nr == dgroup) {
dm->getVertCo(dm, i, co);
VecAddf(vec, vec, co);
count++;
break;
}
}
}
/* calculate average, and apply as new location for matrix */
if (count > 0)
VecMulf(vec, 1.0f / count);
VecMat4MulVecfl(tvec, ob->obmat, vec);
/* copy new location to matrix */
VECCOPY(mat[3], tvec);
}
}
/* function that sets the given matrix based on given vertex group in lattice */
static void contarget_get_lattice_mat (Object *ob, char *substring, float mat[][4])
{
Lattice *lt= (Lattice *)ob->data;
DispList *dl = find_displist(&ob->disp, DL_VERTS);
float *co = dl?dl->verts:NULL;
BPoint *bp = lt->def;
MDeformVert *dvert = lt->dvert;
int tot_verts= lt->pntsu*lt->pntsv*lt->pntsw;
float vec[3]= {0.0f, 0.0f, 0.0f}, tvec[3];
int dgroup=0, grouped=0;
int i, n;
/* initialize target matrix using target matrix */
Mat4CpyMat4(mat, ob->obmat);
/* get index of vertex group */
dgroup = get_named_vertexgroup_num(ob, substring);
if (dgroup < 0) return;
/* 1. Loop through control-points checking if in nominated vertex-group.
* 2. If it is, add it to vec to find the average point.
*/
for (i=0; i < tot_verts; i++, dvert++) {
for (n= 0; n < dvert->totweight; n++) {
/* found match - vert is in vgroup */
if (dvert->dw[n].def_nr == dgroup) {
/* copy coordinates of point to temporary vector, then add to find average */
if (co)
memcpy(tvec, co, 3*sizeof(float));
else
memcpy(tvec, bp->vec, 3*sizeof(float));
VecAddf(vec, vec, tvec);
grouped++;
break;
}
}
/* advance pointer to coordinate data */
if (co) co+= 3;
else bp++;
}
/* find average location, then multiply by ob->obmat to find world-space location */
if (grouped)
VecMulf(vec, 1.0f / grouped);
VecMat4MulVecfl(tvec, ob->obmat, vec);
/* copy new location to matrix */
VECCOPY(mat[3], tvec);
}
/* generic function to get the appropriate matrix for most target cases */
/* The cases where the target can be object data have not been implemented */
static void constraint_target_to_mat4 (Object *ob, const char *substring, float mat[][4], short from, short to)
static void constraint_target_to_mat4 (Object *ob, char *substring, float mat[][4], short from, short to)
{
/* Case OBJECT */
if (!strlen(substring)) {
@ -1116,9 +1223,27 @@ static void constraint_target_to_mat4 (Object *ob, const char *substring, float
constraint_mat_convertspace(ob, NULL, mat, from, to);
}
/* Case VERTEXGROUP */
else if (ELEM(ob->type, OB_MESH, OB_LATTICE)) {
/* devise a matrix from the data in the vertexgroup */
/* TODO: will be handled in other files */
/* Current method just takes the average location of all the points in the
* VertexGroup, and uses that as the location value of the target's matrix
* instead.
*
* TODO: figure out a way to find 3-points to define a rotation plane based
* on the normal of the triangle formed by those three points.
* NOTE: editmode is not currently taken into consideration when doing this
*/
else if (ob->type == OB_MESH) {
/* devise a matrix from the vertices in the vertexgroup */
contarget_get_mesh_mat(ob, substring, mat);
/* make sure it's in the right space for evaluation */
constraint_mat_convertspace(ob, NULL, mat, from, to);
}
else if (ob->type == OB_LATTICE) {
/* devise a matrix from the vertices in the vertexgroup */
contarget_get_lattice_mat(ob, substring, mat);
/* make sure it's in the right space for evaluation */
constraint_mat_convertspace(ob, NULL, mat, from, to);
}
/* Case BONE */
else {
@ -1313,7 +1438,10 @@ short get_constraint_target_matrix (bConstraint *con, short ownertype, void *own
Object *ob= data->tar;
if (data->tar) {
if (strlen(data->subtarget)) {
if (data->tar->type==OB_ARMATURE && strlen(data->subtarget)) {
/* Pose-Channels for the CopyLoc target are handled specially, so that
* we can support using the bone-tip as an option.
*/
bPoseChannel *pchan;
float tmat[4][4];
@ -1334,10 +1462,8 @@ short get_constraint_target_matrix (bConstraint *con, short ownertype, void *own
constraint_mat_convertspace(ob, pchan, mat, CONSTRAINT_SPACE_WORLD, con->tarspace);
}
else {
Mat4CpyMat4(mat, ob->obmat);
/* convert matrix space as required */
constraint_mat_convertspace(ob, NULL, mat, CONSTRAINT_SPACE_WORLD, con->tarspace);
/* get target matrix as is done normally for other constraints */
constraint_target_to_mat4(data->tar, data->subtarget, mat, CONSTRAINT_SPACE_WORLD, con->tarspace);
}
valid=1;
}
@ -2664,10 +2790,10 @@ void solve_constraints (ListBase *conlist, bConstraintOb *cob, float ctime)
/* value should have been set from IPO's/Constraint Channels already */
enf = con->enforce;
/* move target/owner into right spaces */
/* move owner into right space */
constraint_mat_convertspace(cob->ob, cob->pchan, cob->matrix, CONSTRAINT_SPACE_WORLD, con->ownspace);
/* Get the target matrix */
/* Get the target matrix - in right space to be used */
ownerdata= ((cob->pchan)? (void *)cob->pchan : (void *)cob->ob);
get_constraint_target_matrix(con, cob->type, ownerdata, tarmat, ctime);

26
source/blender/blenkernel/intern/deform.c
View File

@ -113,14 +113,31 @@ bDeformGroup *get_named_vertexgroup (Object *ob, char *name)
return NULL;
}
int get_defgroup_num (Object *ob, bDeformGroup *dg)
int get_named_vertexgroup_num (Object *ob, char *name)
{
/* Return the location of the named deform group within the list of
* deform groups. This function is a combination of get_defgroup_num and
* get_named_vertexgroup. The other two could be called instead, but that
* require looping over the vertexgroups twice.
*/
bDeformGroup *curdef;
int def_nr;
for (curdef=ob->defbase.first, def_nr=0; curdef; curdef=curdef->next, def_nr++) {
if (!strcmp(curdef->name, name))
return def_nr;
}
return -1;
}
int get_defgroup_num (Object *ob, bDeformGroup *dg)
{
/* Fetch the location of this deform group
* within the linked list of deform groups.
* (this number is stored in the deform
* weights of the deform verts to link them
* to this deform group) deform deform
* deform blah blah deform
* to this deform group).
*/
bDeformGroup *eg;
@ -129,8 +146,7 @@ int get_defgroup_num (Object *ob, bDeformGroup *dg)
eg = ob->defbase.first;
def_nr = 0;
/* loop through all deform groups
*/
/* loop through all deform groups */
while (eg != NULL) {
/* if the current deform group is

47
source/blender/src/buttons_object.c
View File

@ -540,12 +540,13 @@ static void draw_constraint (uiBlock *block, ListBase *list, bConstraint *con, s
uiBut *but;
char typestr[64], *subtarget;
short height, width = 265;
short is_armature_target, is_armature_owner;
short is_armature_target, is_geom_target, is_armature_owner;
int rb_col;
target= get_constraint_target(con, &subtarget);
is_armature_target= (target && target->type==OB_ARMATURE);
is_armature_owner= ((ob->type == OB_ARMATURE) && (ob->flag & OB_POSEMODE));
is_geom_target= (target && (ELEM(target->type, OB_MESH, OB_LATTICE)) );
/* unless button has own callback, it adds this callback to button */
uiBlockSetFunc(block, constraint_active_func, ob, con);
@ -639,6 +640,10 @@ static void draw_constraint (uiBlock *block, ListBase *list, bConstraint *con, s
but= uiDefBut(block, TEX, B_CONSTRAINT_CHANGETARGET, "BO:", *xco+120, *yco-66,150,18, &data->subtarget, 0, 24, 0, 0, "Subtarget Bone");
uiButSetCompleteFunc(but, autocomplete_bone, (void *)data->tar);
}
else if (is_geom_target) {
but= uiDefBut(block, TEX, B_CONSTRAINT_CHANGETARGET, "VG:", *xco+120, *yco-66,150,18, &data->subtarget, 0, 24, 0, 0, "Name of Vertex Group defining 'target' points");
uiButSetCompleteFunc(but, autocomplete_vgroup, (void *)data->tar);
}
else {
strcpy (data->subtarget, "");
}
@ -737,6 +742,10 @@ static void draw_constraint (uiBlock *block, ListBase *list, bConstraint *con, s
but= uiDefBut(block, TEX, B_CONSTRAINT_CHANGETARGET, "BO:", *xco+120, *yco-42,135,18, &data->subtarget, 0, 24, 0, 0, "Subtarget Bone to use as Parent");
uiButSetCompleteFunc(but, autocomplete_bone, (void *)data->tar);
}
else if (is_geom_target) {
but= uiDefBut(block, TEX, B_CONSTRAINT_CHANGETARGET, "VG:", *xco+120, *yco-42,135,18, &data->subtarget, 0, 24, 0, 0, "Name of Vertex Group defining 'target' points");
uiButSetCompleteFunc(but, autocomplete_vgroup, (void *)data->tar);
}
else {
strcpy (data->subtarget, "");
}
@ -791,6 +800,10 @@ static void draw_constraint (uiBlock *block, ListBase *list, bConstraint *con, s
but= uiDefBut(block, TEX, B_CONSTRAINT_CHANGETARGET, "BO:", *xco+120, *yco-42,135,18, &data->subtarget, 0, 24, 0, 0, "Subtarget Bone");
uiButSetCompleteFunc(but, autocomplete_bone, (void *)data->tar);
}
else if (is_geom_target) {
but= uiDefBut(block, TEX, B_CONSTRAINT_CHANGETARGET, "VG:", *xco+120, *yco-42,135,18, &data->subtarget, 0, 24, 0, 0, "Name of Vertex Group defining 'target' points");
uiButSetCompleteFunc(but, autocomplete_vgroup, (void *)data->tar);
}
else {
strcpy (data->subtarget, "");
}
@ -834,6 +847,10 @@ static void draw_constraint (uiBlock *block, ListBase *list, bConstraint *con, s
but= uiDefBut(block, TEX, B_CONSTRAINT_CHANGETARGET, "BO:", *xco+120, *yco-42,135,18, &data->subtarget, 0, 24, 0, 0, "Subtarget Bone");
uiButSetCompleteFunc(but, autocomplete_bone, (void *)data->tar);
}
else if (is_geom_target) {
but= uiDefBut(block, TEX, B_CONSTRAINT_CHANGETARGET, "VG:", *xco+120, *yco-42,135,18, &data->subtarget, 0, 24, 0, 0, "Name of Vertex Group defining 'target' points");
uiButSetCompleteFunc(but, autocomplete_vgroup, (void *)data->tar);
}
else {
strcpy (data->subtarget, "");
}
@ -872,6 +889,10 @@ static void draw_constraint (uiBlock *block, ListBase *list, bConstraint *con, s
but= uiDefBut(block, TEX, B_CONSTRAINT_CHANGETARGET, "BO:", *xco+120, *yco-42,135,18, &data->subtarget, 0, 24, 0, 0, "Subtarget Bone");
uiButSetCompleteFunc(but, autocomplete_bone, (void *)data->tar);
}
else if (is_geom_target) {
but= uiDefBut(block, TEX, B_CONSTRAINT_CHANGETARGET, "VG:", *xco+120, *yco-42,135,18, &data->subtarget, 0, 24, 0, 0, "Name of Vertex Group defining 'target' points");
uiButSetCompleteFunc(but, autocomplete_vgroup, (void *)data->tar);
}
else {
strcpy (data->subtarget, "");
}
@ -908,6 +929,10 @@ static void draw_constraint (uiBlock *block, ListBase *list, bConstraint *con, s
but=uiDefBut(block, TEX, B_CONSTRAINT_CHANGETARGET, "BO:", *xco+120, *yco-42,135,19, &data->subtarget, 0, 24, 0, 0, "Subtarget Bone");
uiButSetCompleteFunc(but, autocomplete_bone, (void *)data->tar);
}
else if (is_geom_target) {
but= uiDefBut(block, TEX, B_CONSTRAINT_CHANGETARGET, "VG:", *xco+120, *yco-42,135,18, &data->subtarget, 0, 24, 0, 0, "Name of Vertex Group defining 'target' points");
uiButSetCompleteFunc(but, autocomplete_vgroup, (void *)data->tar);
}
else {
strcpy (data->subtarget, "");
}
@ -944,6 +969,10 @@ static void draw_constraint (uiBlock *block, ListBase *list, bConstraint *con, s
but=uiDefBut(block, TEX, B_CONSTRAINT_CHANGETARGET, "BO:", *xco+120, *yco-42,135,18, &data->subtarget, 0, 24, 0, 0, "Subtarget Bone");
uiButSetCompleteFunc(but, autocomplete_bone, (void *)data->tar);
}
else if (is_geom_target) {
but= uiDefBut(block, TEX, B_CONSTRAINT_CHANGETARGET, "VG:", *xco+120, *yco-42,135,18, &data->subtarget, 0, 24, 0, 0, "Name of Vertex Group defining 'target' points");
uiButSetCompleteFunc(but, autocomplete_vgroup, (void *)data->tar);
}
else {
strcpy (data->subtarget, "");
}
@ -998,6 +1027,10 @@ static void draw_constraint (uiBlock *block, ListBase *list, bConstraint *con, s
but=uiDefBut(block, TEX, B_CONSTRAINT_CHANGETARGET, "BO:", *xco+120, *yco-42,135,18, &data->subtarget, 0, 24, 0, 0, "Subtarget Bone");
uiButSetCompleteFunc(but, autocomplete_bone, (void *)data->tar);
}
else if (is_geom_target) {
but= uiDefBut(block, TEX, B_CONSTRAINT_CHANGETARGET, "VG:", *xco+120, *yco-42,135,18, &data->subtarget, 0, 24, 0, 0, "Name of Vertex Group defining 'target' points");
uiButSetCompleteFunc(but, autocomplete_vgroup, (void *)data->tar);
}
else {
strcpy (data->subtarget, "");
}
@ -1035,6 +1068,10 @@ static void draw_constraint (uiBlock *block, ListBase *list, bConstraint *con, s
but=uiDefBut(block, TEX, B_CONSTRAINT_CHANGETARGET, "BO:", *xco+120, *yco-42,135,18, &data->subtarget, 0, 24, 0, 0, "Subtarget Bone");
uiButSetCompleteFunc(but, autocomplete_bone, (void *)data->tar);
}
else if (is_geom_target) {
but= uiDefBut(block, TEX, B_CONSTRAINT_CHANGETARGET, "VG:", *xco+120, *yco-42,135,18, &data->subtarget, 0, 24, 0, 0, "Name of Vertex Group defining 'target' points");
uiButSetCompleteFunc(but, autocomplete_vgroup, (void *)data->tar);
}
else {
strcpy (data->subtarget, "");
}
@ -1116,6 +1153,10 @@ static void draw_constraint (uiBlock *block, ListBase *list, bConstraint *con, s
but=uiDefBut(block, TEX, B_CONSTRAINT_CHANGETARGET, "BO:", *xco+120, *yco-42,135,18, &data->subtarget, 0, 24, 0, 0, "Subtarget Bone");
uiButSetCompleteFunc(but, autocomplete_bone, (void *)data->tar);
}
else if (is_geom_target) {
but= uiDefBut(block, TEX, B_CONSTRAINT_CHANGETARGET, "VG:", *xco+120, *yco-42,135,18, &data->subtarget, 0, 24, 0, 0, "Name of Vertex Group defining 'target' points");
uiButSetCompleteFunc(but, autocomplete_vgroup, (void *)data->tar);
}
else {
strcpy (data->subtarget, "");
}
@ -1403,6 +1444,10 @@ static void draw_constraint (uiBlock *block, ListBase *list, bConstraint *con, s
but= uiDefBut(block, TEX, B_CONSTRAINT_CHANGETARGET, "BO:", *xco+120, *yco-42,135,18, &data->subtarget, 0, 24, 0, 0, "Subtarget Bone to use as Parent");
uiButSetCompleteFunc(but, autocomplete_bone, (void *)data->tar);
}
else if (is_geom_target) {
but= uiDefBut(block, TEX, B_CONSTRAINT_CHANGETARGET, "VG:", *xco+120, *yco-66,150,18, &data->subtarget, 0, 24, 0, 0, "Name of Vertex Group defining 'target' points");
uiButSetCompleteFunc(but, autocomplete_vgroup, (void *)data->tar);
}
else {
strcpy(data->subtarget, "");
}