void BVHSpatialSplit::split_reference(const BVHBuild& builder,
BVHReference& left,
BVHReference& right,
const BVHReference& ref,
int dim,
float pos)
{
/* initialize boundboxes */
BoundBox left_bounds = BoundBox::empty;
BoundBox right_bounds = BoundBox::empty;
/* loop over vertices/edges. */
const Object *ob = builder.objects[ref.prim_object()];
const Mesh *mesh = ob->mesh;
if(ref.prim_type() & PRIMITIVE_ALL_TRIANGLE) {
split_triangle_reference(ref,
mesh,
dim,
pos,
left_bounds,
right_bounds);
}
else if(ref.prim_type() & PRIMITIVE_ALL_CURVE) {
split_curve_reference(ref,
mesh,
dim,
pos,
left_bounds,
right_bounds);
}
else {
split_object_reference(ob,
dim,
pos,
left_bounds,
right_bounds);
}
/* intersect with original bounds. */
left_bounds.max[dim] = pos;
right_bounds.min[dim] = pos;
left_bounds.intersect(ref.bounds());
right_bounds.intersect(ref.bounds());
/* set references */
left = BVHReference(left_bounds, ref.prim_index(), ref.prim_object(), ref.prim_type());
right = BVHReference(right_bounds, ref.prim_index(), ref.prim_object(), ref.prim_type());
}
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_reference_object(BoundBox& root, BoundBox& center, Object *ob, int i)
{
references.push_back(BVHReference(ob->bounds, -1, i, 0));
root.grow(ob->bounds);
center.grow(ob->bounds.center2());
}
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());
}
}
}
}