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/*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software Foundation,
* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
/** \file
* \ingroup modifiers
*/
#include <vector>
#include "BKE_lib_query.h"
#include "BKE_mesh.h"
#include "BKE_modifier.h"
#include "BKE_volume.h"
#include "MOD_modifiertypes.h"
#include "MOD_ui_common.h"
#include "DNA_mesh_types.h"
#include "DNA_meshdata_types.h"
#include "DNA_modifier_types.h"
#include "DNA_object_types.h"
#include "DNA_screen_types.h"
#include "DNA_volume_types.h"
#include "UI_interface.h"
#include "UI_resources.h"
#include "RNA_access.h"
#include "BLI_float4x4.hh"
#include "BLI_math_vector.h"
#include "BLI_span.hh"
#include "BLI_timeit.hh"
#include "DEG_depsgraph_query.h"
#ifdef WITH_OPENVDB
# include <openvdb/tools/GridTransformer.h>
# include <openvdb/tools/VolumeToMesh.h>
#endif
using blender::float3;
using blender::float4x4;
using blender::Span;
static void initData(ModifierData *md)
{
VolumeToMeshModifierData *vmmd = reinterpret_cast<VolumeToMeshModifierData *>(md);
vmmd->object = NULL;
vmmd->threshold = 0.1f;
strncpy(vmmd->grid_name, "density", MAX_NAME);
vmmd->adaptivity = 0.0f;
vmmd->resolution_mode = VOLUME_TO_MESH_RESOLUTION_MODE_GRID;
vmmd->voxel_amount = 32;
vmmd->voxel_size = 0.1f;
vmmd->flag = 0;
}
static void updateDepsgraph(ModifierData *md, const ModifierUpdateDepsgraphContext *ctx)
{
VolumeToMeshModifierData *vmmd = reinterpret_cast<VolumeToMeshModifierData *>(md);
DEG_add_modifier_to_transform_relation(ctx->node, "Volume to Mesh Modifier");
if (vmmd->object) {
DEG_add_object_relation(
ctx->node, vmmd->object, DEG_OB_COMP_GEOMETRY, "Volume to Mesh Modifier");
DEG_add_object_relation(
ctx->node, vmmd->object, DEG_OB_COMP_TRANSFORM, "Volume to Mesh Modifier");
}
}
static void foreachIDLink(ModifierData *md, Object *ob, IDWalkFunc walk, void *userData)
{
VolumeToMeshModifierData *vmmd = reinterpret_cast<VolumeToMeshModifierData *>(md);
walk(userData, ob, (ID **)&vmmd->object, IDWALK_CB_NOP);
}
static void panel_draw(const bContext *UNUSED(C), Panel *panel)
{
uiLayout *layout = panel->layout;
PointerRNA *ptr = modifier_panel_get_property_pointers(panel, NULL);
VolumeToMeshModifierData *vmmd = static_cast<VolumeToMeshModifierData *>(ptr->data);
uiLayoutSetPropSep(layout, true);
uiLayoutSetPropDecorate(layout, false);
{
uiLayout *col = uiLayoutColumn(layout, false);
uiItemR(col, ptr, "object", 0, NULL, ICON_NONE);
uiItemR(col, ptr, "grid_name", 0, NULL, ICON_NONE);
}
{
uiLayout *col = uiLayoutColumn(layout, false);
uiItemR(col, ptr, "resolution_mode", 0, NULL, ICON_NONE);
if (vmmd->resolution_mode == VOLUME_TO_MESH_RESOLUTION_MODE_VOXEL_AMOUNT) {
uiItemR(col, ptr, "voxel_amount", 0, NULL, ICON_NONE);
}
else if (vmmd->resolution_mode == VOLUME_TO_MESH_RESOLUTION_MODE_VOXEL_SIZE) {
uiItemR(col, ptr, "voxel_size", 0, NULL, ICON_NONE);
}
}
{
uiLayout *col = uiLayoutColumn(layout, false);
uiItemR(col, ptr, "threshold", 0, NULL, ICON_NONE);
uiItemR(col, ptr, "adaptivity", 0, NULL, ICON_NONE);
uiItemR(col, ptr, "use_smooth_shade", 0, NULL, ICON_NONE);
}
modifier_panel_end(layout, ptr);
}
static void panelRegister(ARegionType *region_type)
{
modifier_panel_register(region_type, eModifierType_VolumeToMesh, panel_draw);
}
#ifdef WITH_OPENVDB
struct VolumeToMeshOp {
const openvdb::GridBase &base_grid;
VolumeToMeshModifierData &vmmd;
const ModifierEvalContext &ctx;
std::vector<openvdb::Vec3s> verts;
std::vector<openvdb::Vec3I> tris;
std::vector<openvdb::Vec4I> quads;
template<typename GridType> bool operator()()
{
if constexpr (std::is_scalar_v<typename GridType::ValueType>) {
this->generate_mesh_data<GridType>();
return true;
}
else {
return false;
}
}
template<typename GridType> void generate_mesh_data()
{
/* Make a new transform from the index space into the mesh object space. */
openvdb::math::Transform::Ptr transform = this->base_grid.transform().copy();
transform->postMult(openvdb::Mat4d((float *)vmmd.object->obmat));
openvdb::Mat4d imat = openvdb::Mat4d((float *)ctx.object->imat);
/* `imat` had floating point issues and wasn't affine. */
imat.setCol(3, openvdb::Vec4d(0, 0, 0, 1));
transform->postMult(imat);
/* Create a new grid with a different transform. The underlying tree is shared. */
typename GridType::ConstPtr grid = openvdb::gridConstPtrCast<GridType>(
this->base_grid.copyGridReplacingTransform(transform));
if (this->vmmd.resolution_mode == VOLUME_TO_MESH_RESOLUTION_MODE_GRID) {
this->grid_to_mesh(*grid);
return;
}
const float resolution_factor = this->compute_resolution_factor(*grid);
typename GridType::Ptr temp_grid = this->create_grid_with_changed_resolution(
*grid, resolution_factor);
this->grid_to_mesh(*temp_grid);
}
template<typename GridType>
typename GridType::Ptr create_grid_with_changed_resolution(const GridType &old_grid,
const float resolution_factor)
{
BLI_assert(resolution_factor > 0.0f);
openvdb::Mat4R xform;
xform.setToScale(openvdb::Vec3d(resolution_factor));
openvdb::tools::GridTransformer transformer{xform};
typename GridType::Ptr new_grid = GridType::create();
transformer.transformGrid<openvdb::tools::BoxSampler>(old_grid, *new_grid);
new_grid->transform() = old_grid.transform();
new_grid->transform().preScale(1.0f / resolution_factor);
return new_grid;
}
float compute_resolution_factor(const openvdb::GridBase &grid) const
{
const openvdb::Vec3s voxel_size{grid.voxelSize()};
const float current_voxel_size = std::max({voxel_size[0], voxel_size[1], voxel_size[2]});
const float desired_voxel_size = this->compute_desired_voxel_size(grid);
return current_voxel_size / desired_voxel_size;
}
float compute_desired_voxel_size(const openvdb::GridBase &grid) const
{
if (this->vmmd.resolution_mode == VOLUME_TO_MESH_RESOLUTION_MODE_VOXEL_SIZE) {
return this->vmmd.voxel_size;
}
const openvdb::CoordBBox coord_bbox = base_grid.evalActiveVoxelBoundingBox();
const openvdb::BBoxd bbox = grid.transform().indexToWorld(coord_bbox);
const float max_extent = bbox.extents()[bbox.maxExtent()];
const float voxel_size = max_extent / this->vmmd.voxel_amount;
return voxel_size;
}
template<typename GridType> void grid_to_mesh(const GridType &grid)
{
openvdb::tools::volumeToMesh(
grid, this->verts, this->tris, this->quads, this->vmmd.threshold, this->vmmd.adaptivity);
}
};
static Mesh *new_mesh_from_openvdb_data(Span<openvdb::Vec3s> verts,
Span<openvdb::Vec3I> tris,
Span<openvdb::Vec4I> quads)
{
const int tot_loops = 3 * tris.size() + 4 * quads.size();
const int tot_polys = tris.size() + quads.size();
Mesh *mesh = BKE_mesh_new_nomain(verts.size(), 0, 0, tot_loops, tot_polys);
/* Write vertices. */
for (const int i : verts.index_range()) {
const blender::float3 co = blender::float3(verts[i].asV());
copy_v3_v3(mesh->mvert[i].co, co);
}
/* Write triangles. */
for (const int i : tris.index_range()) {
mesh->mpoly[i].loopstart = 3 * i;
mesh->mpoly[i].totloop = 3;
for (int j = 0; j < 3; j++) {
/* Reverse vertex order to get correct normals. */
mesh->mloop[3 * i + j].v = tris[i][2 - j];
}
}
/* Write quads. */
const int poly_offset = tris.size();
const int loop_offset = tris.size() * 3;
for (const int i : quads.index_range()) {
mesh->mpoly[poly_offset + i].loopstart = loop_offset + 4 * i;
mesh->mpoly[poly_offset + i].totloop = 4;
for (int j = 0; j < 4; j++) {
/* Reverse vertex order to get correct normals. */
mesh->mloop[loop_offset + 4 * i + j].v = quads[i][3 - j];
}
}
BKE_mesh_calc_edges(mesh, false, false);
BKE_mesh_calc_normals(mesh);
return mesh;
}
#endif
static Mesh *modifyMesh(ModifierData *md, const ModifierEvalContext *ctx, Mesh *input_mesh)
{
#ifdef WITH_OPENVDB
VolumeToMeshModifierData *vmmd = reinterpret_cast<VolumeToMeshModifierData *>(md);
if (vmmd->object == nullptr) {
return input_mesh;
}
if (vmmd->object->type != OB_VOLUME) {
return input_mesh;
}
if (vmmd->resolution_mode == VOLUME_TO_MESH_RESOLUTION_MODE_VOXEL_SIZE &&
vmmd->voxel_size == 0.0f) {
return input_mesh;
}
if (vmmd->resolution_mode == VOLUME_TO_MESH_RESOLUTION_MODE_VOXEL_AMOUNT &&
vmmd->voxel_amount == 0) {
return input_mesh;
}
Volume *volume = static_cast<Volume *>(vmmd->object->data);
BKE_volume_load(volume, DEG_get_bmain(ctx->depsgraph));
VolumeGrid *volume_grid = BKE_volume_grid_find(volume, vmmd->grid_name);
if (volume_grid == nullptr) {
BKE_modifier_set_error(md, "Cannot find '%s' grid", vmmd->grid_name);
return input_mesh;
}
const openvdb::GridBase::ConstPtr grid = BKE_volume_grid_openvdb_for_read(volume, volume_grid);
const VolumeGridType grid_type = BKE_volume_grid_type(volume_grid);
VolumeToMeshOp to_mesh_op{*grid, *vmmd, *ctx};
if (!BKE_volume_grid_type_operation(grid_type, to_mesh_op)) {
BKE_modifier_set_error(md, "Expected a scalar grid");
return input_mesh;
}
Mesh *mesh = new_mesh_from_openvdb_data(to_mesh_op.verts, to_mesh_op.tris, to_mesh_op.quads);
BKE_mesh_copy_settings(mesh, input_mesh);
if (vmmd->flag & VOLUME_TO_MESH_USE_SMOOTH_SHADE) {
BKE_mesh_smooth_flag_set(mesh, true);
}
return mesh;
#else
UNUSED_VARS(md, ctx);
BKE_modifier_set_error(md, "Compiled without OpenVDB");
return input_mesh;
#endif
}
ModifierTypeInfo modifierType_VolumeToMesh = {
/* name */ "Volume to Mesh",
/* structName */ "VolumeToMeshModifierData",
/* structSize */ sizeof(VolumeToMeshModifierData),
/* srna */ &RNA_VolumeToMeshModifier,
/* type */ eModifierTypeType_Constructive,
/* flags */ eModifierTypeFlag_AcceptsMesh,
/* icon */ ICON_VOLUME_DATA, /* TODO: Use correct icon. */
/* copyData */ BKE_modifier_copydata_generic,
/* deformVerts */ NULL,
/* deformMatrices */ NULL,
/* deformVertsEM */ NULL,
/* deformMatricesEM */ NULL,
/* modifyMesh */ modifyMesh,
/* modifyHair */ NULL,
/* modifyPointCloud */ NULL,
/* modifyVolume */ NULL,
/* initData */ initData,
/* requiredDataMask */ NULL,
/* freeData */ NULL,
/* isDisabled */ NULL,
/* updateDepsgraph */ updateDepsgraph,
/* dependsOnTime */ NULL,
/* dependsOnNormals */ NULL,
/* foreachIDLink */ foreachIDLink,
/* foreachTexLink */ NULL,
/* freeRuntimeData */ NULL,
/* panelRegister */ panelRegister,
/* blendWrite */ NULL,
/* blendRead */ NULL,
};
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