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blender/intern/cycles/blender/blender_mesh.cpp
Sergey Sharybin 28604c46a1 Cycles: Make Blender importer more forward compatible 
Basically the idea is to make code robust against extending
enum options in the future by falling back to a known safe
default setting when RNA is set to something unknown.

While this approach solves the issues similar to T47377,
but it wouldn't really help when/if any of the RNA values
gets ever deprecated and removed. There'll be no simple
solution to that apart from defining explicit mapping from
RNA value to Cycles one.

Another part which isn't so great actually is that we now
have to have some enum guards and give some explicit values
to the enum items, but we can live with that perhaps.

Reviewers: dingto, juicyfruit, lukasstockner97, brecht

Reviewed By: brecht

Differential Revision: https://developer.blender.org/D1785
2016-02-12 15:27:33 +01:00

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/*
* Copyright 2011-2013 Blender Foundation
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "mesh.h"
#include "object.h"
#include "scene.h"
#include "blender_sync.h"
#include "blender_session.h"
#include "blender_util.h"
#include "subd_mesh.h"
#include "subd_patch.h"
#include "subd_split.h"
#include "util_foreach.h"
#include "util_logging.h"
#include "util_math.h"
#include "mikktspace.h"
CCL_NAMESPACE_BEGIN
/* Per-face bit flags. */
enum {
/* Face has no special flags. */
FACE_FLAG_NONE = (0 << 0),
/* Quad face was split using 1-3 diagonal. */
FACE_FLAG_DIVIDE_13 = (1 << 0),
/* Quad face was split using 2-4 diagonal. */
FACE_FLAG_DIVIDE_24 = (1 << 1),
};
/* Get vertex indices to create triangles from a given face.
*
* Two triangles has vertex indices in the original Blender-side face.
* If face is already a quad tri_b will not be initialized.
*/
inline void face_split_tri_indices(const int num_verts,
const int face_flag,
int tri_a[3],
int tri_b[3])
{
if(face_flag & FACE_FLAG_DIVIDE_24) {
tri_a[0] = 0;
tri_a[1] = 1;
tri_a[2] = 3;
if(num_verts == 4) {
tri_b[0] = 2;
tri_b[1] = 3;
tri_b[2] = 1;
}
}
else /*if(face_flag & FACE_FLAG_DIVIDE_13)*/ {
tri_a[0] = 0;
tri_a[1] = 1;
tri_a[2] = 2;
if(num_verts == 4) {
tri_b[0] = 0;
tri_b[1] = 2;
tri_b[2] = 3;
}
}
}
/* Tangent Space */
struct MikkUserData {
MikkUserData(const BL::Mesh& mesh_,
BL::MeshTextureFaceLayer *layer_,
int num_faces_)
: mesh(mesh_), layer(layer_), num_faces(num_faces_)
{
tangent.resize(num_faces*4);
}
BL::Mesh mesh;
BL::MeshTextureFaceLayer *layer;
int num_faces;
vector<float4> tangent;
};
static int mikk_get_num_faces(const SMikkTSpaceContext *context)
{
MikkUserData *userdata = (MikkUserData*)context->m_pUserData;
return userdata->num_faces;
}
static int mikk_get_num_verts_of_face(const SMikkTSpaceContext *context, const int face_num)
{
MikkUserData *userdata = (MikkUserData*)context->m_pUserData;
BL::MeshTessFace f = userdata->mesh.tessfaces[face_num];
int4 vi = get_int4(f.vertices_raw());
return (vi[3] == 0)? 3: 4;
}
static void mikk_get_position(const SMikkTSpaceContext *context, float P[3], const int face_num, const int vert_num)
{
MikkUserData *userdata = (MikkUserData*)context->m_pUserData;
BL::MeshTessFace f = userdata->mesh.tessfaces[face_num];
int4 vi = get_int4(f.vertices_raw());
BL::MeshVertex v = userdata->mesh.vertices[vi[vert_num]];
float3 vP = get_float3(v.co());
P[0] = vP.x;
P[1] = vP.y;
P[2] = vP.z;
}
static void mikk_get_texture_coordinate(const SMikkTSpaceContext *context, float uv[2], const int face_num, const int vert_num)
{
MikkUserData *userdata = (MikkUserData*)context->m_pUserData;
if(userdata->layer != NULL) {
BL::MeshTextureFace tf = userdata->layer->data[face_num];
float3 tfuv;
switch(vert_num) {
case 0:
tfuv = get_float3(tf.uv1());
break;
case 1:
tfuv = get_float3(tf.uv2());
break;
case 2:
tfuv = get_float3(tf.uv3());
break;
default:
tfuv = get_float3(tf.uv4());
break;
}
uv[0] = tfuv.x;
uv[1] = tfuv.y;
}
else {
int vert_idx = userdata->mesh.tessfaces[face_num].vertices()[vert_num];
float3 orco =
get_float3(userdata->mesh.vertices[vert_idx].undeformed_co());
float2 tmp = map_to_sphere(make_float3(orco[0], orco[1], orco[2]));
uv[0] = tmp.x;
uv[1] = tmp.y;
}
}
static void mikk_get_normal(const SMikkTSpaceContext *context, float N[3], const int face_num, const int vert_num)
{
MikkUserData *userdata = (MikkUserData*)context->m_pUserData;
BL::MeshTessFace f = userdata->mesh.tessfaces[face_num];
float3 vN;
if(f.use_smooth()) {
int4 vi = get_int4(f.vertices_raw());
BL::MeshVertex v = userdata->mesh.vertices[vi[vert_num]];
vN = get_float3(v.normal());
}
else {
vN = get_float3(f.normal());
}
N[0] = vN.x;
N[1] = vN.y;
N[2] = vN.z;
}
static void mikk_set_tangent_space(const SMikkTSpaceContext *context, const float T[], const float sign, const int face, const int vert)
{
MikkUserData *userdata = (MikkUserData*)context->m_pUserData;
userdata->tangent[face*4 + vert] = make_float4(T[0], T[1], T[2], sign);
}
static void mikk_compute_tangents(BL::Mesh& b_mesh,
BL::MeshTextureFaceLayer *b_layer,
Mesh *mesh,
const vector<int>& nverts,
const vector<int>& face_flags,
bool need_sign,
bool active_render)
{
/* setup userdata */
MikkUserData userdata(b_mesh, b_layer, nverts.size());
/* setup interface */
SMikkTSpaceInterface sm_interface;
memset(&sm_interface, 0, sizeof(sm_interface));
sm_interface.m_getNumFaces = mikk_get_num_faces;
sm_interface.m_getNumVerticesOfFace = mikk_get_num_verts_of_face;
sm_interface.m_getPosition = mikk_get_position;
sm_interface.m_getTexCoord = mikk_get_texture_coordinate;
sm_interface.m_getNormal = mikk_get_normal;
sm_interface.m_setTSpaceBasic = mikk_set_tangent_space;
/* setup context */
SMikkTSpaceContext context;
memset(&context, 0, sizeof(context));
context.m_pUserData = &userdata;
context.m_pInterface = &sm_interface;
/* compute tangents */
genTangSpaceDefault(&context);
/* create tangent attributes */
Attribute *attr;
ustring name;
if(b_layer != NULL)
name = ustring((string(b_layer->name().c_str()) + ".tangent").c_str());
else
name = ustring("orco.tangent");
if(active_render)
attr = mesh->attributes.add(ATTR_STD_UV_TANGENT, name);
else
attr = mesh->attributes.add(name, TypeDesc::TypeVector, ATTR_ELEMENT_CORNER);
float3 *tangent = attr->data_float3();
/* create bitangent sign attribute */
float *tangent_sign = NULL;
if(need_sign) {
Attribute *attr_sign;
ustring name_sign;
if(b_layer != NULL)
name_sign = ustring((string(b_layer->name().c_str()) + ".tangent_sign").c_str());
else
name_sign = ustring("orco.tangent_sign");
if(active_render)
attr_sign = mesh->attributes.add(ATTR_STD_UV_TANGENT_SIGN, name_sign);
else
attr_sign = mesh->attributes.add(name_sign, TypeDesc::TypeFloat, ATTR_ELEMENT_CORNER);
tangent_sign = attr_sign->data_float();
}
for(int i = 0; i < nverts.size(); i++) {
int tri_a[3], tri_b[3];
face_split_tri_indices(nverts[i], face_flags[i], tri_a, tri_b);
tangent[0] = float4_to_float3(userdata.tangent[i*4 + tri_a[0]]);
tangent[1] = float4_to_float3(userdata.tangent[i*4 + tri_a[1]]);
tangent[2] = float4_to_float3(userdata.tangent[i*4 + tri_a[2]]);
tangent += 3;
if(tangent_sign) {
tangent_sign[0] = userdata.tangent[i*4 + tri_a[0]].w;
tangent_sign[1] = userdata.tangent[i*4 + tri_a[1]].w;
tangent_sign[2] = userdata.tangent[i*4 + tri_a[2]].w;
tangent_sign += 3;
}
if(nverts[i] == 4) {
tangent[0] = float4_to_float3(userdata.tangent[i*4 + tri_b[0]]);
tangent[1] = float4_to_float3(userdata.tangent[i*4 + tri_b[1]]);
tangent[2] = float4_to_float3(userdata.tangent[i*4 + tri_b[2]]);
tangent += 3;
if(tangent_sign) {
tangent_sign[0] = userdata.tangent[i*4 + tri_b[0]].w;
tangent_sign[1] = userdata.tangent[i*4 + tri_b[1]].w;
tangent_sign[2] = userdata.tangent[i*4 + tri_b[2]].w;
tangent_sign += 3;
}
}
}
}
/* Create Volume Attribute */
static void create_mesh_volume_attribute(BL::Object& b_ob,
Mesh *mesh,
ImageManager *image_manager,
AttributeStandard std,
float frame)
{
BL::SmokeDomainSettings b_domain = object_smoke_domain_find(b_ob);
if(!b_domain)
return;
Attribute *attr = mesh->attributes.add(std);
VoxelAttribute *volume_data = attr->data_voxel();
bool is_float, is_linear;
bool animated = false;
volume_data->manager = image_manager;
volume_data->slot = image_manager->add_image(
Attribute::standard_name(std),
b_ob.ptr.data,
animated,
frame,
is_float,
is_linear,
INTERPOLATION_LINEAR,
EXTENSION_REPEAT,
true);
}
static void create_mesh_volume_attributes(Scene *scene,
BL::Object& b_ob,
Mesh *mesh,
float frame)
{
/* for smoke volume rendering */
if(mesh->need_attribute(scene, ATTR_STD_VOLUME_DENSITY))
create_mesh_volume_attribute(b_ob, mesh, scene->image_manager, ATTR_STD_VOLUME_DENSITY, frame);
if(mesh->need_attribute(scene, ATTR_STD_VOLUME_COLOR))
create_mesh_volume_attribute(b_ob, mesh, scene->image_manager, ATTR_STD_VOLUME_COLOR, frame);
if(mesh->need_attribute(scene, ATTR_STD_VOLUME_FLAME))
create_mesh_volume_attribute(b_ob, mesh, scene->image_manager, ATTR_STD_VOLUME_FLAME, frame);
if(mesh->need_attribute(scene, ATTR_STD_VOLUME_HEAT))
create_mesh_volume_attribute(b_ob, mesh, scene->image_manager, ATTR_STD_VOLUME_HEAT, frame);
if(mesh->need_attribute(scene, ATTR_STD_VOLUME_VELOCITY))
create_mesh_volume_attribute(b_ob, mesh, scene->image_manager, ATTR_STD_VOLUME_VELOCITY, frame);
}
/* Create vertex color attributes. */
static void attr_create_vertex_color(Scene *scene,
Mesh *mesh,
BL::Mesh& b_mesh,
const vector<int>& nverts,
const vector<int>& face_flags)
{
BL::Mesh::tessface_vertex_colors_iterator l;
for(b_mesh.tessface_vertex_colors.begin(l); l != b_mesh.tessface_vertex_colors.end(); ++l) {
if(!mesh->need_attribute(scene, ustring(l->name().c_str())))
continue;
Attribute *attr = mesh->attributes.add(
ustring(l->name().c_str()), TypeDesc::TypeColor, ATTR_ELEMENT_CORNER_BYTE);
BL::MeshColorLayer::data_iterator c;
uchar4 *cdata = attr->data_uchar4();
size_t i = 0;
for(l->data.begin(c); c != l->data.end(); ++c, ++i) {
int tri_a[3], tri_b[3];
face_split_tri_indices(nverts[i], face_flags[i], tri_a, tri_b);
uchar4 colors[4];
colors[0] = color_float_to_byte(color_srgb_to_scene_linear(get_float3(c->color1())));
colors[1] = color_float_to_byte(color_srgb_to_scene_linear(get_float3(c->color2())));
colors[2] = color_float_to_byte(color_srgb_to_scene_linear(get_float3(c->color3())));
if(nverts[i] == 4) {
colors[3] = color_float_to_byte(color_srgb_to_scene_linear(get_float3(c->color4())));
}
cdata[0] = colors[tri_a[0]];
cdata[1] = colors[tri_a[1]];
cdata[2] = colors[tri_a[2]];
if(nverts[i] == 4) {
cdata[3] = colors[tri_b[0]];
cdata[4] = colors[tri_b[1]];
cdata[5] = colors[tri_b[2]];
cdata += 6;
}
else
cdata += 3;
}
}
}
/* Create uv map attributes. */
static void attr_create_uv_map(Scene *scene,
Mesh *mesh,
BL::Mesh& b_mesh,
const vector<int>& nverts,
const vector<int>& face_flags)
{
if(b_mesh.tessface_uv_textures.length() != 0) {
BL::Mesh::tessface_uv_textures_iterator l;
for(b_mesh.tessface_uv_textures.begin(l); l != b_mesh.tessface_uv_textures.end(); ++l) {
bool active_render = l->active_render();
AttributeStandard std = (active_render)? ATTR_STD_UV: ATTR_STD_NONE;
ustring name = ustring(l->name().c_str());
/* UV map */
if(mesh->need_attribute(scene, name) || mesh->need_attribute(scene, std)) {
Attribute *attr;
if(active_render)
attr = mesh->attributes.add(std, name);
else
attr = mesh->attributes.add(name, TypeDesc::TypePoint, ATTR_ELEMENT_CORNER);
BL::MeshTextureFaceLayer::data_iterator t;
float3 *fdata = attr->data_float3();
size_t i = 0;
for(l->data.begin(t); t != l->data.end(); ++t, ++i) {
int tri_a[3], tri_b[3];
face_split_tri_indices(nverts[i], face_flags[i], tri_a, tri_b);
float3 uvs[4];
uvs[0] = get_float3(t->uv1());
uvs[1] = get_float3(t->uv2());
uvs[2] = get_float3(t->uv3());
if(nverts[i] == 4) {
uvs[3] = get_float3(t->uv4());
}
fdata[0] = uvs[tri_a[0]];
fdata[1] = uvs[tri_a[1]];
fdata[2] = uvs[tri_a[2]];
fdata += 3;
if(nverts[i] == 4) {
fdata[0] = uvs[tri_b[0]];
fdata[1] = uvs[tri_b[1]];
fdata[2] = uvs[tri_b[2]];
fdata += 3;
}
}
}
/* UV tangent */
std = (active_render)? ATTR_STD_UV_TANGENT: ATTR_STD_NONE;
name = ustring((string(l->name().c_str()) + ".tangent").c_str());
if(mesh->need_attribute(scene, name) || (active_render && mesh->need_attribute(scene, std))) {
std = (active_render)? ATTR_STD_UV_TANGENT_SIGN: ATTR_STD_NONE;
name = ustring((string(l->name().c_str()) + ".tangent_sign").c_str());
bool need_sign = (mesh->need_attribute(scene, name) || mesh->need_attribute(scene, std));
mikk_compute_tangents(b_mesh,
&(*l),
mesh,
nverts,
face_flags,
need_sign,
active_render);
}
}
}
else if(mesh->need_attribute(scene, ATTR_STD_UV_TANGENT)) {
bool need_sign = mesh->need_attribute(scene, ATTR_STD_UV_TANGENT_SIGN);
mikk_compute_tangents(b_mesh,
NULL,
mesh,
nverts,
face_flags,
need_sign,
true);
}
}
/* Create vertex pointiness attributes. */
static void attr_create_pointiness(Scene *scene,
Mesh *mesh,
BL::Mesh& b_mesh)
{
if(mesh->need_attribute(scene, ATTR_STD_POINTINESS)) {
const int numverts = b_mesh.vertices.length();
Attribute *attr = mesh->attributes.add(ATTR_STD_POINTINESS);
float *data = attr->data_float();
int *counter = new int[numverts];
float *raw_data = new float[numverts];
float3 *edge_accum = new float3[numverts];
/* Calculate pointiness using single ring neighborhood. */
memset(counter, 0, sizeof(int) * numverts);
memset(raw_data, 0, sizeof(float) * numverts);
memset(edge_accum, 0, sizeof(float3) * numverts);
BL::Mesh::edges_iterator e;
int i = 0;
for(b_mesh.edges.begin(e); e != b_mesh.edges.end(); ++e, ++i) {
int v0 = b_mesh.edges[i].vertices()[0],
v1 = b_mesh.edges[i].vertices()[1];
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];
}
i = 0;
BL::Mesh::vertices_iterator v;
for(b_mesh.vertices.begin(v); v != b_mesh.vertices.end(); ++v, ++i) {
if(counter[i] > 0) {
float3 normal = get_float3(b_mesh.vertices[i].normal());
float angle = safe_acosf(dot(normal, edge_accum[i] / counter[i]));
raw_data[i] = angle * M_1_PI_F;
}
else {
raw_data[i] = 0.0f;
}
}
/* Blur vertices to approximate 2 ring neighborhood. */
memset(counter, 0, sizeof(int) * numverts);
memcpy(data, raw_data, sizeof(float) * numverts);
i = 0;
for(b_mesh.edges.begin(e); e != b_mesh.edges.end(); ++e, ++i) {
int v0 = b_mesh.edges[i].vertices()[0],
v1 = b_mesh.edges[i].vertices()[1];
data[v0] += raw_data[v1];
data[v1] += raw_data[v0];
++counter[v0];
++counter[v1];
}
for(i = 0; i < numverts; ++i) {
data[i] /= counter[i] + 1;
}
delete [] counter;
delete [] raw_data;
delete [] edge_accum;
}
}
/* Create Mesh */
static void create_mesh(Scene *scene,
Mesh *mesh,
BL::Mesh& b_mesh,
const vector<uint>& used_shaders)
{
/* count vertices and faces */
int numverts = b_mesh.vertices.length();
int numfaces = b_mesh.tessfaces.length();
int numtris = 0;
bool use_loop_normals = b_mesh.use_auto_smooth();
BL::Mesh::vertices_iterator v;
BL::Mesh::tessfaces_iterator f;
for(b_mesh.tessfaces.begin(f); f != b_mesh.tessfaces.end(); ++f) {
int4 vi = get_int4(f->vertices_raw());
numtris += (vi[3] == 0)? 1: 2;
}
/* reserve memory */
mesh->reserve(numverts, numtris, 0, 0);
/* create vertex coordinates and normals */
int i = 0;
for(b_mesh.vertices.begin(v); v != b_mesh.vertices.end(); ++v, ++i)
mesh->verts[i] = get_float3(v->co());
Attribute *attr_N = mesh->attributes.add(ATTR_STD_VERTEX_NORMAL);
float3 *N = attr_N->data_float3();
for(b_mesh.vertices.begin(v); v != b_mesh.vertices.end(); ++v, ++N)
*N = get_float3(v->normal());
N = attr_N->data_float3();
/* create generated coordinates from undeformed coordinates */
if(mesh->need_attribute(scene, ATTR_STD_GENERATED)) {
Attribute *attr = mesh->attributes.add(ATTR_STD_GENERATED);
float3 loc, size;
mesh_texture_space(b_mesh, loc, size);
float3 *generated = attr->data_float3();
size_t i = 0;
for(b_mesh.vertices.begin(v); v != b_mesh.vertices.end(); ++v)
generated[i++] = get_float3(v->undeformed_co())*size - loc;
}
/* Create needed vertex attributes. */
attr_create_pointiness(scene, mesh, b_mesh);
/* create faces */
vector<int> nverts(numfaces);
vector<int> face_flags(numfaces, FACE_FLAG_NONE);
int fi = 0, ti = 0;
for(b_mesh.tessfaces.begin(f); f != b_mesh.tessfaces.end(); ++f, ++fi) {
int4 vi = get_int4(f->vertices_raw());
int n = (vi[3] == 0)? 3: 4;
int mi = clamp(f->material_index(), 0, used_shaders.size()-1);
int shader = used_shaders[mi];
bool smooth = f->use_smooth() || use_loop_normals;
/* split vertices if normal is different
*
* note all vertex attributes must have been set here so we can split
* and copy attributes in split_vertex without remapping later */
if(use_loop_normals) {
BL::Array<float, 12> loop_normals = f->split_normals();
for(int i = 0; i < n; i++) {
float3 loop_N = make_float3(loop_normals[i * 3], loop_normals[i * 3 + 1], loop_normals[i * 3 + 2]);
if(N[vi[i]] != loop_N) {
int new_vi = mesh->split_vertex(vi[i]);
/* set new normal and vertex index */
N = attr_N->data_float3();
N[new_vi] = loop_N;
vi[i] = new_vi;
}
}
}
/* create triangles */
if(n == 4) {
if(is_zero(cross(mesh->verts[vi[1]] - mesh->verts[vi[0]], mesh->verts[vi[2]] - mesh->verts[vi[0]])) ||
is_zero(cross(mesh->verts[vi[2]] - mesh->verts[vi[0]], mesh->verts[vi[3]] - mesh->verts[vi[0]])))
{
mesh->set_triangle(ti++, vi[0], vi[1], vi[3], shader, smooth);
mesh->set_triangle(ti++, vi[2], vi[3], vi[1], shader, smooth);
face_flags[fi] |= FACE_FLAG_DIVIDE_24;
}
else {
mesh->set_triangle(ti++, vi[0], vi[1], vi[2], shader, smooth);
mesh->set_triangle(ti++, vi[0], vi[2], vi[3], shader, smooth);
face_flags[fi] |= FACE_FLAG_DIVIDE_13;
}
}
else
mesh->set_triangle(ti++, vi[0], vi[1], vi[2], shader, smooth);
nverts[fi] = n;
}
/* Create all needed attributes.
* The calculate functions will check whether they're needed or not.
*/
attr_create_vertex_color(scene, mesh, b_mesh, nverts, face_flags);
attr_create_uv_map(scene, mesh, b_mesh, nverts, face_flags);
/* for volume objects, create a matrix to transform from object space to
* mesh texture space. this does not work with deformations but that can
* probably only be done well with a volume grid mapping of coordinates */
if(mesh->need_attribute(scene, ATTR_STD_GENERATED_TRANSFORM)) {
Attribute *attr = mesh->attributes.add(ATTR_STD_GENERATED_TRANSFORM);
Transform *tfm = attr->data_transform();
float3 loc, size;
mesh_texture_space(b_mesh, loc, size);
*tfm = transform_translate(-loc)*transform_scale(size);
}
}
static void create_subd_mesh(Scene *scene,
Mesh *mesh,
BL::Mesh& b_mesh,
PointerRNA *cmesh,
const vector<uint>& used_shaders)
{
/* create subd mesh */
SubdMesh sdmesh;
/* create vertices */
BL::Mesh::vertices_iterator v;
for(b_mesh.vertices.begin(v); v != b_mesh.vertices.end(); ++v)
sdmesh.add_vert(get_float3(v->co()));
/* create faces */
BL::Mesh::tessfaces_iterator f;
for(b_mesh.tessfaces.begin(f); f != b_mesh.tessfaces.end(); ++f) {
int4 vi = get_int4(f->vertices_raw());
int n = (vi[3] == 0) ? 3: 4;
//int shader = used_shaders[f->material_index()];
if(n == 4)
sdmesh.add_face(vi[0], vi[1], vi[2], vi[3]);
else
sdmesh.add_face(vi[0], vi[1], vi[2]);
}
/* finalize subd mesh */
sdmesh.finish();
/* parameters */
bool need_ptex = mesh->need_attribute(scene, ATTR_STD_PTEX_FACE_ID) ||
mesh->need_attribute(scene, ATTR_STD_PTEX_UV);
SubdParams sdparams(mesh, used_shaders[0], true, need_ptex);
sdparams.dicing_rate = RNA_float_get(cmesh, "dicing_rate");
//scene->camera->update();
//sdparams.camera = scene->camera;
/* tesselate */
DiagSplit dsplit(sdparams);
sdmesh.tessellate(&dsplit);
}
/* Sync */
Mesh *BlenderSync::sync_mesh(BL::Object& b_ob,
bool object_updated,
bool hide_tris)
{
/* When viewport display is not needed during render we can force some
* caches to be releases from blender side in order to reduce peak memory
* footprint during synchronization process.
*/
const bool is_interface_locked = b_engine.render() &&
b_engine.render().use_lock_interface();
const bool can_free_caches = BlenderSession::headless || is_interface_locked;
/* test if we can instance or if the object is modified */
BL::ID b_ob_data = b_ob.data();
BL::ID key = (BKE_object_is_modified(b_ob))? b_ob: b_ob_data;
BL::Material material_override = render_layer.material_override;
/* find shader indices */
vector<uint> used_shaders;
BL::Object::material_slots_iterator slot;
for(b_ob.material_slots.begin(slot); slot != b_ob.material_slots.end(); ++slot) {
if(material_override) {
find_shader(material_override, used_shaders, scene->default_surface);
}
else {
BL::ID b_material(slot->material());
find_shader(b_material, used_shaders, scene->default_surface);
}
}
if(used_shaders.size() == 0) {
if(material_override)
find_shader(material_override, used_shaders, scene->default_surface);
else
used_shaders.push_back(scene->default_surface);
}
/* test if we need to sync */
int requested_geometry_flags = Mesh::GEOMETRY_NONE;
if(render_layer.use_surfaces) {
requested_geometry_flags |= Mesh::GEOMETRY_TRIANGLES;
}
if(render_layer.use_hair) {
requested_geometry_flags |= Mesh::GEOMETRY_CURVES;
}
Mesh *mesh;
if(!mesh_map.sync(&mesh, key)) {
/* if transform was applied to mesh, need full update */
if(object_updated && mesh->transform_applied);
/* test if shaders changed, these can be object level so mesh
* does not get tagged for recalc */
else if(mesh->used_shaders != used_shaders);
else if(requested_geometry_flags != mesh->geometry_flags);
else {
/* even if not tagged for recalc, we may need to sync anyway
* because the shader needs different mesh attributes */
bool attribute_recalc = false;
foreach(uint shader, mesh->used_shaders)
if(scene->shaders[shader]->need_update_attributes)
attribute_recalc = true;
if(!attribute_recalc)
return mesh;
}
}
/* ensure we only sync instanced meshes once */
if(mesh_synced.find(mesh) != mesh_synced.end())
return mesh;
mesh_synced.insert(mesh);
/* create derived mesh */
PointerRNA cmesh = RNA_pointer_get(&b_ob_data.ptr, "cycles");
vector<Mesh::Triangle> oldtriangle = mesh->triangles;
/* compares curve_keys rather than strands in order to handle quick hair
* adjustments in dynamic BVH - other methods could probably do this better*/
vector<float4> oldcurve_keys = mesh->curve_keys;
mesh->clear();
mesh->used_shaders = used_shaders;
mesh->name = ustring(b_ob_data.name().c_str());
if(requested_geometry_flags != Mesh::GEOMETRY_NONE) {
/* mesh objects does have special handle in the dependency graph,
* they're ensured to have properly updated.
*
* updating meshes here will end up having derived mesh referencing
* freed data from the blender side.
*/
if(preview && b_ob.type() != BL::Object::type_MESH)
b_ob.update_from_editmode();
bool need_undeformed = mesh->need_attribute(scene, ATTR_STD_GENERATED);
BL::Mesh b_mesh = object_to_mesh(b_data, b_ob, b_scene, true, !preview, need_undeformed);
if(b_mesh) {
if(render_layer.use_surfaces && !hide_tris) {
if(cmesh.data && experimental && RNA_boolean_get(&cmesh, "use_subdivision"))
create_subd_mesh(scene, mesh, b_mesh, &cmesh, used_shaders);
else
create_mesh(scene, mesh, b_mesh, used_shaders);
create_mesh_volume_attributes(scene, b_ob, mesh, b_scene.frame_current());
}
if(render_layer.use_hair)
sync_curves(mesh, b_mesh, b_ob, false);
if(can_free_caches) {
b_ob.cache_release();
}
/* free derived mesh */
b_data.meshes.remove(b_mesh);
}
}
mesh->geometry_flags = requested_geometry_flags;
/* displacement method */
if(cmesh.data) {
const int method = get_enum(cmesh,
"displacement_method",
Mesh::DISPLACE_NUM_METHODS,
Mesh::DISPLACE_BUMP);
if(method == 0 || !experimental)
mesh->displacement_method = Mesh::DISPLACE_BUMP;
else if(method == 1)
mesh->displacement_method = Mesh::DISPLACE_TRUE;
else
mesh->displacement_method = Mesh::DISPLACE_BOTH;
}
/* tag update */
bool rebuild = false;
if(oldtriangle.size() != mesh->triangles.size())
rebuild = true;
else if(oldtriangle.size()) {
if(memcmp(&oldtriangle[0], &mesh->triangles[0], sizeof(Mesh::Triangle)*oldtriangle.size()) != 0)
rebuild = true;
}
if(oldcurve_keys.size() != mesh->curve_keys.size())
rebuild = true;
else if(oldcurve_keys.size()) {
if(memcmp(&oldcurve_keys[0], &mesh->curve_keys[0], sizeof(float4)*oldcurve_keys.size()) != 0)
rebuild = true;
}
mesh->tag_update(scene, rebuild);
return mesh;
}
void BlenderSync::sync_mesh_motion(BL::Object& b_ob,
Object *object,
float motion_time)
{
/* ensure we only sync instanced meshes once */
Mesh *mesh = object->mesh;
if(mesh_motion_synced.find(mesh) != mesh_motion_synced.end())
return;
mesh_motion_synced.insert(mesh);
/* ensure we only motion sync meshes that also had mesh synced, to avoid
* unnecessary work and to ensure that its attributes were clear */
if(mesh_synced.find(mesh) == mesh_synced.end())
return;
/* for motion pass always compute, for motion blur it can be disabled */
int time_index = 0;
if(scene->need_motion() == Scene::MOTION_BLUR) {
if(!mesh->use_motion_blur)
return;
/* see if this mesh needs motion data at this time */
vector<float> object_times = object->motion_times();
bool found = false;
foreach(float object_time, object_times) {
if(motion_time == object_time) {
found = true;
break;
}
else
time_index++;
}
if(!found)
return;
}
else {
if(motion_time == -1.0f)
time_index = 0;
else if(motion_time == 1.0f)
time_index = 1;
else
return;
}
/* skip empty meshes */
size_t numverts = mesh->verts.size();
size_t numkeys = mesh->curve_keys.size();
if(!numverts && !numkeys)
return;
/* skip objects without deforming modifiers. this is not totally reliable,
* would need a more extensive check to see which objects are animated */
BL::Mesh b_mesh(PointerRNA_NULL);
if(ccl::BKE_object_is_deform_modified(b_ob, b_scene, preview)) {
/* get derived mesh */
b_mesh = object_to_mesh(b_data, b_ob, b_scene, true, !preview, false);
}
if(!b_mesh) {
/* if we have no motion blur on this frame, but on other frames, copy */
if(numverts) {
/* triangles */
Attribute *attr_mP = mesh->attributes.find(ATTR_STD_MOTION_VERTEX_POSITION);
if(attr_mP) {
Attribute *attr_mN = mesh->attributes.find(ATTR_STD_MOTION_VERTEX_NORMAL);
Attribute *attr_N = mesh->attributes.find(ATTR_STD_VERTEX_NORMAL);
float3 *P = &mesh->verts[0];
float3 *N = (attr_N)? attr_N->data_float3(): NULL;
memcpy(attr_mP->data_float3() + time_index*numverts, P, sizeof(float3)*numverts);
if(attr_mN)
memcpy(attr_mN->data_float3() + time_index*numverts, N, sizeof(float3)*numverts);
}
}
if(numkeys) {
/* curves */
Attribute *attr_mP = mesh->curve_attributes.find(ATTR_STD_MOTION_VERTEX_POSITION);
if(attr_mP) {
float4 *keys = &mesh->curve_keys[0];
memcpy(attr_mP->data_float4() + time_index*numkeys, keys, sizeof(float4)*numkeys);
}
}
return;
}
/* TODO(sergey): Perform preliminary check for number of verticies. */
if(numverts) {
/* find attributes */
Attribute *attr_mP = mesh->attributes.find(ATTR_STD_MOTION_VERTEX_POSITION);
Attribute *attr_mN = mesh->attributes.find(ATTR_STD_MOTION_VERTEX_NORMAL);
Attribute *attr_N = mesh->attributes.find(ATTR_STD_VERTEX_NORMAL);
bool new_attribute = false;
/* add new attributes if they don't exist already */
if(!attr_mP) {
attr_mP = mesh->attributes.add(ATTR_STD_MOTION_VERTEX_POSITION);
if(attr_N)
attr_mN = mesh->attributes.add(ATTR_STD_MOTION_VERTEX_NORMAL);
new_attribute = true;
}
/* load vertex data from mesh */
float3 *mP = attr_mP->data_float3() + time_index*numverts;
float3 *mN = (attr_mN)? attr_mN->data_float3() + time_index*numverts: NULL;
BL::Mesh::vertices_iterator v;
int i = 0;
for(b_mesh.vertices.begin(v); v != b_mesh.vertices.end() && i < numverts; ++v, ++i) {
mP[i] = get_float3(v->co());
if(mN)
mN[i] = get_float3(v->normal());
}
/* in case of new attribute, we verify if there really was any motion */
if(new_attribute) {
if(b_mesh.vertices.length() != numverts ||
memcmp(mP, &mesh->verts[0], sizeof(float3)*numverts) == 0)
{
/* no motion, remove attributes again */
VLOG(1) << "No actual deformation motion for object " << b_ob.name();
mesh->attributes.remove(ATTR_STD_MOTION_VERTEX_POSITION);
if(attr_mN)
mesh->attributes.remove(ATTR_STD_MOTION_VERTEX_NORMAL);
}
else if(time_index > 0) {
VLOG(1) << "Filling deformation motion for object " << b_ob.name();
/* motion, fill up previous steps that we might have skipped because
* they had no motion, but we need them anyway now */
float3 *P = &mesh->verts[0];
float3 *N = (attr_N)? attr_N->data_float3(): NULL;
for(int step = 0; step < time_index; step++) {
memcpy(attr_mP->data_float3() + step*numverts, P, sizeof(float3)*numverts);
if(attr_mN)
memcpy(attr_mN->data_float3() + step*numverts, N, sizeof(float3)*numverts);
}
}
}
}
/* hair motion */
if(numkeys)
sync_curves(mesh, b_mesh, b_ob, true, time_index);
/* free derived mesh */
b_data.meshes.remove(b_mesh);
}
CCL_NAMESPACE_END
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