/* compute uv coordinates of mouse in face */
static void imapaint_pick_uv(Scene *scene, Object *ob, unsigned int faceindex, const int xy[2], float uv[2])
{
DerivedMesh *dm = mesh_get_derived_final(scene, ob, CD_MASK_BAREMESH);
MTFace *tf_base, *tf;
Material *ma;
TexPaintSlot *slot;
int numfaces = dm->getNumTessFaces(dm), a, findex;
float p[2], w[3], absw, minabsw;
MFace mf;
MVert mv[4];
float matrix[4][4], proj[4][4];
GLint view[4];
/* compute barycentric coordinates */
/* double lookup */
const int *index_mf_to_mpoly = dm->getTessFaceDataArray(dm, CD_ORIGINDEX);
const int *index_mp_to_orig = dm->getPolyDataArray(dm, CD_ORIGINDEX);
if (index_mf_to_mpoly == NULL) {
index_mp_to_orig = NULL;
}
/* get the needed opengl matrices */
glGetIntegerv(GL_VIEWPORT, view);
glGetFloatv(GL_MODELVIEW_MATRIX, (float *)matrix);
glGetFloatv(GL_PROJECTION_MATRIX, (float *)proj);
view[0] = view[1] = 0;
mul_m4_m4m4(matrix, matrix, ob->obmat);
mul_m4_m4m4(matrix, proj, matrix);
minabsw = 1e10;
uv[0] = uv[1] = 0.0;
/* test all faces in the derivedmesh with the original index of the picked face */
for (a = 0; a < numfaces; a++) {
findex = index_mf_to_mpoly ? DM_origindex_mface_mpoly(index_mf_to_mpoly, index_mp_to_orig, a) : a;
if (findex == faceindex) {
dm->getTessFace(dm, a, &mf);
ma = dm->mat[mf.mat_nr];
slot = &ma->texpaintslot[ma->paint_active_slot];
dm->getVert(dm, mf.v1, &mv[0]);
dm->getVert(dm, mf.v2, &mv[1]);
dm->getVert(dm, mf.v3, &mv[2]);
if (mf.v4)
dm->getVert(dm, mf.v4, &mv[3]);
if (!slot->uvname || !(tf_base = CustomData_get_layer_named(&dm->faceData, CD_MTFACE, slot->uvname)))
tf_base = CustomData_get_layer(&dm->faceData, CD_MTFACE);
tf = &tf_base[a];
p[0] = xy[0];
p[1] = xy[1];
if (mf.v4) {
/* the triangle with the largest absolute values is the one
* with the most negative weights */
imapaint_tri_weights(matrix, view, mv[0].co, mv[1].co, mv[3].co, p, w);
absw = fabsf(w[0]) + fabsf(w[1]) + fabsf(w[2]);
if (absw < minabsw) {
uv[0] = tf->uv[0][0] * w[0] + tf->uv[1][0] * w[1] + tf->uv[3][0] * w[2];
uv[1] = tf->uv[0][1] * w[0] + tf->uv[1][1] * w[1] + tf->uv[3][1] * w[2];
minabsw = absw;
}
imapaint_tri_weights(matrix, view, mv[1].co, mv[2].co, mv[3].co, p, w);
absw = fabsf(w[0]) + fabsf(w[1]) + fabsf(w[2]);
if (absw < minabsw) {
uv[0] = tf->uv[1][0] * w[0] + tf->uv[2][0] * w[1] + tf->uv[3][0] * w[2];
uv[1] = tf->uv[1][1] * w[0] + tf->uv[2][1] * w[1] + tf->uv[3][1] * w[2];
minabsw = absw;
}
}
else {
imapaint_tri_weights(matrix, view, mv[0].co, mv[1].co, mv[2].co, p, w);
absw = fabsf(w[0]) + fabsf(w[1]) + fabsf(w[2]);
if (absw < minabsw) {
uv[0] = tf->uv[0][0] * w[0] + tf->uv[1][0] * w[1] + tf->uv[2][0] * w[2];
uv[1] = tf->uv[0][1] * w[0] + tf->uv[1][1] * w[1] + tf->uv[2][1] * w[2];
minabsw = absw;
}
}
}
}
dm->release(dm);
}
/* compute uv coordinates of mouse in face */
void imapaint_pick_uv(Scene *scene, Object *ob, Mesh *mesh, unsigned int faceindex, int *xy, float *uv)
{
DerivedMesh *dm = mesh_get_derived_final(scene, ob, CD_MASK_BAREMESH);
int *index = dm->getFaceDataArray(dm, CD_ORIGINDEX);
MTFace *tface = dm->getFaceDataArray(dm, CD_MTFACE), *tf;
int numfaces = dm->getNumFaces(dm), a;
float p[2], w[3], absw, minabsw;
MFace mf;
MVert mv[4];
minabsw = 1e10;
uv[0] = uv[1] = 0.0;
/* test all faces in the derivedmesh with the original index of the picked face */
for(a = 0; a < numfaces; a++) {
if(index[a] == faceindex) {
dm->getFace(dm, a, &mf);
dm->getVert(dm, mf.v1, &mv[0]);
dm->getVert(dm, mf.v2, &mv[1]);
dm->getVert(dm, mf.v3, &mv[2]);
if(mf.v4)
dm->getVert(dm, mf.v4, &mv[3]);
tf= &tface[a];
p[0]= xy[0];
p[1]= xy[1];
if(mf.v4) {
/* the triangle with the largest absolute values is the one
with the most negative weights */
imapaint_tri_weights(ob, mv[0].co, mv[1].co, mv[3].co, p, w);
absw= fabs(w[0]) + fabs(w[1]) + fabs(w[2]);
if(absw < minabsw) {
uv[0]= tf->uv[0][0]*w[0] + tf->uv[1][0]*w[1] + tf->uv[3][0]*w[2];
uv[1]= tf->uv[0][1]*w[0] + tf->uv[1][1]*w[1] + tf->uv[3][1]*w[2];
minabsw = absw;
}
imapaint_tri_weights(ob, mv[1].co, mv[2].co, mv[3].co, p, w);
absw= fabs(w[0]) + fabs(w[1]) + fabs(w[2]);
if(absw < minabsw) {
uv[0]= tf->uv[1][0]*w[0] + tf->uv[2][0]*w[1] + tf->uv[3][0]*w[2];
uv[1]= tf->uv[1][1]*w[0] + tf->uv[2][1]*w[1] + tf->uv[3][1]*w[2];
minabsw = absw;
}
}
else {
imapaint_tri_weights(ob, mv[0].co, mv[1].co, mv[2].co, p, w);
absw= fabs(w[0]) + fabs(w[1]) + fabs(w[2]);
if(absw < minabsw) {
uv[0]= tf->uv[0][0]*w[0] + tf->uv[1][0]*w[1] + tf->uv[2][0]*w[2];
uv[1]= tf->uv[0][1]*w[0] + tf->uv[1][1]*w[1] + tf->uv[2][1]*w[2];
minabsw = absw;
}
}
}
}
dm->release(dm);
}
/* compute uv coordinates of mouse in face */
void imapaint_pick_uv(Scene *scene, Object *ob, unsigned int faceindex, const int xy[2], float uv[2])
{
DerivedMesh *dm = mesh_get_derived_final(scene, ob, CD_MASK_BAREMESH);
MTFace *tface = dm->getTessFaceDataArray(dm, CD_MTFACE), *tf;
int numfaces = dm->getNumTessFaces(dm), a, findex;
float p[2], w[3], absw, minabsw;
MFace mf;
MVert mv[4];
/* double lookup */
const int *index_mf_to_mpoly = dm->getTessFaceDataArray(dm, CD_ORIGINDEX);
const int *index_mp_to_orig = dm->getPolyDataArray(dm, CD_ORIGINDEX);
if (index_mf_to_mpoly == NULL) {
index_mp_to_orig = NULL;
}
minabsw = 1e10;
uv[0] = uv[1] = 0.0;
/* test all faces in the derivedmesh with the original index of the picked face */
for (a = 0; a < numfaces; a++) {
findex = index_mf_to_mpoly ? DM_origindex_mface_mpoly(index_mf_to_mpoly, index_mp_to_orig, a) : a;
if (findex == faceindex) {
dm->getTessFace(dm, a, &mf);
dm->getVert(dm, mf.v1, &mv[0]);
dm->getVert(dm, mf.v2, &mv[1]);
dm->getVert(dm, mf.v3, &mv[2]);
if (mf.v4)
dm->getVert(dm, mf.v4, &mv[3]);
tf = &tface[a];
p[0] = xy[0];
p[1] = xy[1];
if (mf.v4) {
/* the triangle with the largest absolute values is the one
* with the most negative weights */
imapaint_tri_weights(ob, mv[0].co, mv[1].co, mv[3].co, p, w);
absw = fabsf(w[0]) + fabsf(w[1]) + fabsf(w[2]);
if (absw < minabsw) {
uv[0] = tf->uv[0][0] * w[0] + tf->uv[1][0] * w[1] + tf->uv[3][0] * w[2];
uv[1] = tf->uv[0][1] * w[0] + tf->uv[1][1] * w[1] + tf->uv[3][1] * w[2];
minabsw = absw;
}
imapaint_tri_weights(ob, mv[1].co, mv[2].co, mv[3].co, p, w);
absw = fabsf(w[0]) + fabsf(w[1]) + fabsf(w[2]);
if (absw < minabsw) {
uv[0] = tf->uv[1][0] * w[0] + tf->uv[2][0] * w[1] + tf->uv[3][0] * w[2];
uv[1] = tf->uv[1][1] * w[0] + tf->uv[2][1] * w[1] + tf->uv[3][1] * w[2];
minabsw = absw;
}
}
else {
imapaint_tri_weights(ob, mv[0].co, mv[1].co, mv[2].co, p, w);
absw = fabsf(w[0]) + fabsf(w[1]) + fabsf(w[2]);
if (absw < minabsw) {
uv[0] = tf->uv[0][0] * w[0] + tf->uv[1][0] * w[1] + tf->uv[2][0] * w[2];
uv[1] = tf->uv[0][1] * w[0] + tf->uv[1][1] * w[1] + tf->uv[2][1] * w[2];
minabsw = absw;
}
}
}
}
dm->release(dm);
}
