void BVHBuild::add_reference_mesh(BoundBox& root, BoundBox& center, Mesh *mesh, int i)
{
for(uint j = 0; j < mesh->triangles.size(); j++) {
Mesh::Triangle t = mesh->triangles[j];
BoundBox bounds = BoundBox::empty;
for(int k = 0; k < 3; k++) {
float3 co = mesh->verts[t.v[k]];
bounds.grow(co);
}
if(bounds.valid()) {
references.push_back(BVHReference(bounds, j, i, ~0));
root.grow(bounds);
center.grow(bounds.center2());
}
}
for(uint j = 0; j < mesh->curves.size(); j++) {
Mesh::Curve curve = mesh->curves[j];
for(int k = 0; k < curve.num_keys - 1; k++) {
BoundBox bounds = BoundBox::empty;
float3 co[4];
co[0] = mesh->curve_keys[max(curve.first_key + k - 1,curve.first_key)].co;
co[1] = mesh->curve_keys[curve.first_key + k].co;
co[2] = mesh->curve_keys[curve.first_key + k + 1].co;
co[3] = mesh->curve_keys[min(curve.first_key + k + 2, curve.first_key + curve.num_keys - 1)].co;
float3 lower;
float3 upper;
curvebounds(&lower.x, &upper.x, co, 0);
curvebounds(&lower.y, &upper.y, co, 1);
curvebounds(&lower.z, &upper.z, co, 2);
float mr = max(mesh->curve_keys[curve.first_key + k].radius, mesh->curve_keys[curve.first_key + k + 1].radius);
bounds.grow(lower, mr);
bounds.grow(upper, mr);
if(bounds.valid()) {
references.push_back(BVHReference(bounds, j, i, k));
root.grow(bounds);
center.grow(bounds.center2());
}
}
}
}
void BVHBuild::add_references(BVHRange& root)
{
/* reserve space for references */
size_t num_alloc_references = 0;
foreach(Object *ob, objects) {
if(params.top_level) {
if(!ob->mesh->is_instanced()) {
num_alloc_references += ob->mesh->triangles.size();
num_alloc_references += count_curve_segments(ob->mesh);
}
else
num_alloc_references++;
}
else {
num_alloc_references += ob->mesh->triangles.size();
num_alloc_references += count_curve_segments(ob->mesh);
}
}
references.reserve(num_alloc_references);
/* add references from objects */
BoundBox bounds = BoundBox::empty, center = BoundBox::empty;
int i = 0;
foreach(Object *ob, objects) {
if(params.top_level) {
if(!ob->mesh->is_instanced())
add_reference_mesh(bounds, center, ob->mesh, i);
else
add_reference_object(bounds, center, ob, i);
}
else
add_reference_mesh(bounds, center, ob->mesh, i);
i++;
if(progress.get_cancel()) return;
}
/* happens mostly on empty meshes */
if(!bounds.valid())
bounds.grow(make_float3(0.0f, 0.0f, 0.0f));
root = BVHRange(bounds, center, 0, references.size());
}
void BVHBuild::add_reference_mesh(BoundBox& root, BoundBox& center, Mesh *mesh, int i)
{
Attribute *attr_mP = NULL;
if(mesh->has_motion_blur())
attr_mP = mesh->attributes.find(ATTR_STD_MOTION_VERTEX_POSITION);
for(uint j = 0; j < mesh->triangles.size(); j++) {
Mesh::Triangle t = mesh->triangles[j];
BoundBox bounds = BoundBox::empty;
PrimitiveType type = PRIMITIVE_TRIANGLE;
t.bounds_grow(&mesh->verts[0], bounds);
/* motion triangles */
if(attr_mP) {
size_t mesh_size = mesh->verts.size();
size_t steps = mesh->motion_steps - 1;
float3 *vert_steps = attr_mP->data_float3();
for(size_t i = 0; i < steps; i++)
t.bounds_grow(vert_steps + i*mesh_size, bounds);
type = PRIMITIVE_MOTION_TRIANGLE;
}
if(bounds.valid()) {
references.push_back(BVHReference(bounds, j, i, type));
root.grow(bounds);
center.grow(bounds.center2());
}
}
Attribute *curve_attr_mP = NULL;
if(mesh->has_motion_blur())
curve_attr_mP = mesh->curve_attributes.find(ATTR_STD_MOTION_VERTEX_POSITION);
for(uint j = 0; j < mesh->curves.size(); j++) {
Mesh::Curve curve = mesh->curves[j];
PrimitiveType type = PRIMITIVE_CURVE;
for(int k = 0; k < curve.num_keys - 1; k++) {
BoundBox bounds = BoundBox::empty;
curve.bounds_grow(k, &mesh->curve_keys[0], bounds);
/* motion curve */
if(curve_attr_mP) {
size_t mesh_size = mesh->curve_keys.size();
size_t steps = mesh->motion_steps - 1;
float4 *key_steps = curve_attr_mP->data_float4();
for(size_t i = 0; i < steps; i++)
curve.bounds_grow(k, key_steps + i*mesh_size, bounds);
type = PRIMITIVE_MOTION_CURVE;
}
if(bounds.valid()) {
int packed_type = PRIMITIVE_PACK_SEGMENT(type, k);
references.push_back(BVHReference(bounds, j, i, packed_type));
root.grow(bounds);
center.grow(bounds.center2());
}
}
}
}