void outPut::gen_normalMap()
{
coords3d<float> somme(0,0,0), contribution;
coords3d<float> vert_normal(0,0,1);
vert_normal.normalize();
for(int x = 0; x < _dimensions.x; x++)
{
for(int y = 0; y < _dimensions.y; y++)
{
somme = coords3d<float>::retournercoords3d(0,0,0);
/* 0,1
-1,1 +--+--+
|\2|\*|
|1\|3\|
-1,0 +--+--+ 1,0
|\4|\6|
|*\|5\|
+--+--+ 1,-1
0,-1
*/
somme+= coords3d<float>::cross(getVertex<float>(x,y)-getVertex<float>(x-1,y), getVertex<float>(x-1,y+1)-getVertex<float>(x-1,y)); //1
somme+= coords3d<float>::cross(getVertex<float>(x-1,y+1)-getVertex<float>(x,y+1), getVertex<float>(x,y)-getVertex<float>(x,y+1)); //2
somme+= coords3d<float>::cross(getVertex<float>(x+1,y)-getVertex<float>(x,y), getVertex<float>(x,y+1)-getVertex<float>(x,y)); //3
somme+= coords3d<float>::cross(getVertex<float>(x-1,y)-getVertex<float>(x,y), getVertex<float>(x,y-1)-getVertex<float>(x,y)); //4
somme+= coords3d<float>::cross(getVertex<float>(x+1,y-1)-getVertex<float>(x,y-1), getVertex<float>(x,y)-getVertex<float>(x,y-1)); //5
somme+= coords3d<float>::cross(getVertex<float>(x,y)-getVertex<float>(x+1,y), getVertex<float>(x+1,y-1)-getVertex<float>(x+1,y)); //6
somme.normalize();
_scene3d.normalMap[x][y] = somme;
}
}
}
static void attr_create_pointiness(Scene *scene, Mesh *mesh, BL::Mesh &b_mesh, bool subdivision)
{
if (!mesh->need_attribute(scene, ATTR_STD_POINTINESS)) {
return;
}
const int num_verts = b_mesh.vertices.length();
if (num_verts == 0) {
return;
}
/* STEP 1: Find out duplicated vertices and point duplicates to a single
* original vertex.
*/
vector<int> sorted_vert_indeices(num_verts);
for (int vert_index = 0; vert_index < num_verts; ++vert_index) {
sorted_vert_indeices[vert_index] = vert_index;
}
VertexAverageComparator compare(mesh->verts);
sort(sorted_vert_indeices.begin(), sorted_vert_indeices.end(), compare);
/* This array stores index of the original vertex for the given vertex
* index.
*/
vector<int> vert_orig_index(num_verts);
for (int sorted_vert_index = 0; sorted_vert_index < num_verts; ++sorted_vert_index) {
const int vert_index = sorted_vert_indeices[sorted_vert_index];
const float3 &vert_co = mesh->verts[vert_index];
bool found = false;
for (int other_sorted_vert_index = sorted_vert_index + 1; other_sorted_vert_index < num_verts;
++other_sorted_vert_index) {
const int other_vert_index = sorted_vert_indeices[other_sorted_vert_index];
const float3 &other_vert_co = mesh->verts[other_vert_index];
/* We are too far away now, we wouldn't have duplicate. */
if ((other_vert_co.x + other_vert_co.y + other_vert_co.z) -
(vert_co.x + vert_co.y + vert_co.z) >
3 * FLT_EPSILON) {
break;
}
/* Found duplicate. */
if (len_squared(other_vert_co - vert_co) < FLT_EPSILON) {
found = true;
vert_orig_index[vert_index] = other_vert_index;
break;
}
}
if (!found) {
vert_orig_index[vert_index] = vert_index;
}
}
/* Make sure we always points to the very first orig vertex. */
for (int vert_index = 0; vert_index < num_verts; ++vert_index) {
int orig_index = vert_orig_index[vert_index];
while (orig_index != vert_orig_index[orig_index]) {
orig_index = vert_orig_index[orig_index];
}
vert_orig_index[vert_index] = orig_index;
}
sorted_vert_indeices.free_memory();
/* STEP 2: Calculate vertex normals taking into account their possible
* duplicates which gets "welded" together.
*/
vector<float3> vert_normal(num_verts, make_float3(0.0f, 0.0f, 0.0f));
/* First we accumulate all vertex normals in the original index. */
for (int vert_index = 0; vert_index < num_verts; ++vert_index) {
const float3 normal = get_float3(b_mesh.vertices[vert_index].normal());
const int orig_index = vert_orig_index[vert_index];
vert_normal[orig_index] += normal;
}
/* Then we normalize the accumulated result and flush it to all duplicates
* as well.
*/
for (int vert_index = 0; vert_index < num_verts; ++vert_index) {
const int orig_index = vert_orig_index[vert_index];
vert_normal[vert_index] = normalize(vert_normal[orig_index]);
}
/* STEP 3: Calculate pointiness using single ring neighborhood. */
vector<int> counter(num_verts, 0);
vector<float> raw_data(num_verts, 0.0f);
vector<float3> edge_accum(num_verts, make_float3(0.0f, 0.0f, 0.0f));
BL::Mesh::edges_iterator e;
EdgeMap visited_edges;
int edge_index = 0;
memset(&counter[0], 0, sizeof(int) * counter.size());
for (b_mesh.edges.begin(e); e != b_mesh.edges.end(); ++e, ++edge_index) {
const int v0 = vert_orig_index[b_mesh.edges[edge_index].vertices()[0]],
v1 = vert_orig_index[b_mesh.edges[edge_index].vertices()[1]];
if (visited_edges.exists(v0, v1)) {
continue;
}
visited_edges.insert(v0, v1);
float3 co0 = get_float3(b_mesh.vertices[v0].co()), co1 = get_float3(b_mesh.vertices[v1].co());
float3 edge = normalize(co1 - co0);
edge_accum[v0] += edge;
edge_accum[v1] += -edge;
++counter[v0];
++counter[v1];
}
for (int vert_index = 0; vert_index < num_verts; ++vert_index) {
const int orig_index = vert_orig_index[vert_index];
if (orig_index != vert_index) {
/* Skip duplicates, they'll be overwritten later on. */
continue;
}
if (counter[vert_index] > 0) {
const float3 normal = vert_normal[vert_index];
const float angle = safe_acosf(dot(normal, edge_accum[vert_index] / counter[vert_index]));
raw_data[vert_index] = angle * M_1_PI_F;
}
else {
raw_data[vert_index] = 0.0f;
}
}
/* STEP 3: Blur vertices to approximate 2 ring neighborhood. */
AttributeSet &attributes = (subdivision) ? mesh->subd_attributes : mesh->attributes;
Attribute *attr = attributes.add(ATTR_STD_POINTINESS);
float *data = attr->data_float();
memcpy(data, &raw_data[0], sizeof(float) * raw_data.size());
memset(&counter[0], 0, sizeof(int) * counter.size());
edge_index = 0;
visited_edges.clear();
for (b_mesh.edges.begin(e); e != b_mesh.edges.end(); ++e, ++edge_index) {
const int v0 = vert_orig_index[b_mesh.edges[edge_index].vertices()[0]],
v1 = vert_orig_index[b_mesh.edges[edge_index].vertices()[1]];
if (visited_edges.exists(v0, v1)) {
continue;
}
visited_edges.insert(v0, v1);
data[v0] += raw_data[v1];
data[v1] += raw_data[v0];
++counter[v0];
++counter[v1];
}
for (int vert_index = 0; vert_index < num_verts; ++vert_index) {
data[vert_index] /= counter[vert_index] + 1;
}
/* STEP 4: Copy attribute to the duplicated vertices. */
for (int vert_index = 0; vert_index < num_verts; ++vert_index) {
const int orig_index = vert_orig_index[vert_index];
data[vert_index] = data[orig_index];
}
}