static DerivedMesh *doMirrorOnAxis(MirrorModifierData *mmd,
Object *ob,
DerivedMesh *dm,
int axis)
{
int i;
float tolerance = mmd->tolerance;
DerivedMesh *result;
int numVerts, numEdges, numFaces;
int maxVerts = dm->getNumVerts(dm);
int maxEdges = dm->getNumEdges(dm);
int maxFaces = dm->getNumFaces(dm);
int *flip_map= NULL, flip_map_len= 0;
int do_vgroup_mirr= (mmd->flag & MOD_MIR_VGROUP);
unsigned int (*indexMap)[2];
float mtx[4][4], imtx[4][4];
numVerts = numEdges = numFaces = 0;
indexMap = MEM_mallocN(sizeof(*indexMap) * maxVerts, "indexmap");
result = CDDM_from_template(dm, maxVerts * 2, maxEdges * 2, maxFaces * 2);
if (do_vgroup_mirr) {
flip_map= defgroup_flip_map(ob, &flip_map_len, FALSE);
if(flip_map == NULL)
do_vgroup_mirr= 0;
}
if (mmd->mirror_ob) {
float obinv[4][4];
invert_m4_m4(obinv, mmd->mirror_ob->obmat);
mult_m4_m4m4(mtx, obinv, ob->obmat);
invert_m4_m4(imtx, mtx);
}
for(i = 0; i < maxVerts; i++) {
MVert inMV;
MVert *mv = CDDM_get_vert(result, numVerts);
int isShared;
float co[3];
dm->getVert(dm, i, &inMV);
copy_v3_v3(co, inMV.co);
if (mmd->mirror_ob) {
mul_m4_v3(mtx, co);
}
if(mmd->flag & MOD_MIR_NO_MERGE)
isShared = 0;
else
isShared = ABS(co[axis])<=tolerance;
/* Because the topology result (# of vertices) must be the same if
* the mesh data is overridden by vertex cos, have to calc sharedness
* based on original coordinates. This is why we test before copy.
*/
DM_copy_vert_data(dm, result, i, numVerts, 1);
*mv = inMV;
indexMap[i][0] = numVerts;
indexMap[i][1] = !isShared;
numVerts++;
if(isShared ) {
co[axis] = 0.0f;
if (mmd->mirror_ob) {
mul_m4_v3(imtx, co);
}
copy_v3_v3(mv->co, co);
mv->flag |= ME_VERT_MERGED;
}
else {
MVert *mv2 = CDDM_get_vert(result, numVerts);
DM_copy_vert_data(dm, result, i, numVerts, 1);
*mv2 = *mv;
co[axis] = -co[axis];
if (mmd->mirror_ob) {
mul_m4_v3(imtx, co);
}
copy_v3_v3(mv2->co, co);
if (do_vgroup_mirr) {
MDeformVert *dvert= DM_get_vert_data(result, numVerts, CD_MDEFORMVERT);
if(dvert) {
defvert_flip(dvert, flip_map, flip_map_len);
}
}
numVerts++;
}
}
for(i = 0; i < maxEdges; i++) {
MEdge inMED;
MEdge *med = CDDM_get_edge(result, numEdges);
dm->getEdge(dm, i, &inMED);
DM_copy_edge_data(dm, result, i, numEdges, 1);
*med = inMED;
numEdges++;
med->v1 = indexMap[inMED.v1][0];
med->v2 = indexMap[inMED.v2][0];
if(indexMap[inMED.v1][1] || indexMap[inMED.v2][1]) {
MEdge *med2 = CDDM_get_edge(result, numEdges);
DM_copy_edge_data(dm, result, i, numEdges, 1);
*med2 = *med;
numEdges++;
med2->v1 += indexMap[inMED.v1][1];
med2->v2 += indexMap[inMED.v2][1];
}
}
for(i = 0; i < maxFaces; i++) {
MFace inMF;
MFace *mf = CDDM_get_face(result, numFaces);
dm->getFace(dm, i, &inMF);
DM_copy_face_data(dm, result, i, numFaces, 1);
*mf = inMF;
numFaces++;
mf->v1 = indexMap[inMF.v1][0];
mf->v2 = indexMap[inMF.v2][0];
mf->v3 = indexMap[inMF.v3][0];
mf->v4 = indexMap[inMF.v4][0];
if ( indexMap[inMF.v1][1] ||
indexMap[inMF.v2][1] ||
indexMap[inMF.v3][1] ||
(mf->v4 && indexMap[inMF.v4][1]))
{
MFace *mf2 = CDDM_get_face(result, numFaces);
static int corner_indices[4] = {2, 1, 0, 3};
DM_copy_face_data(dm, result, i, numFaces, 1);
*mf2 = *mf;
mf2->v1 += indexMap[inMF.v1][1];
mf2->v2 += indexMap[inMF.v2][1];
mf2->v3 += indexMap[inMF.v3][1];
if(inMF.v4) mf2->v4 += indexMap[inMF.v4][1];
/* mirror UVs if enabled */
if(mmd->flag & (MOD_MIR_MIRROR_U | MOD_MIR_MIRROR_V)) {
MTFace *tf = result->getFaceData(result, numFaces, CD_MTFACE);
if(tf) {
int j;
for(j = 0; j < 4; ++j) {
if(mmd->flag & MOD_MIR_MIRROR_U)
tf->uv[j][0] = 1.0f - tf->uv[j][0];
if(mmd->flag & MOD_MIR_MIRROR_V)
tf->uv[j][1] = 1.0f - tf->uv[j][1];
}
}
}
/* Flip face normal */
SWAP(unsigned int, mf2->v1, mf2->v3);
DM_swap_face_data(result, numFaces, corner_indices);
test_index_face(mf2, &result->faceData, numFaces, inMF.v4?4:3);
numFaces++;
}
}
