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Geometry Nodes: Add volume grid creation nodes

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Add three nodes to the currently experimental volume grid nodes:
- **Mesh to Density Grid**
- **Mesh to SDF Grid**
- **Points to SDF Grid**

These nodes are just wrappers over basic OpenVDB utilities.
The difference from existing volume nodes is that they output
a grid directly instead of a geometry set.

See the design here: https://devtalk.blender.org/t/volumes-in-geometry-nodes-proposal/31917

Pull Request: https://projects.blender.org/blender/blender/pulls/118761
This commit is contained in:
Hans Goudey
2024-02-28 22:15:10 +01:00
committed by Hans Goudey
parent 6d3b68c9df
commit bea33a6be9
12 changed files with 352 additions and 88 deletions
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63
source/blender/geometry/intern/mesh_to_volume.cc
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@@ -6,6 +6,7 @@
#include "BLI_task.hh"
#include "BKE_volume.hh"
#include "BKE_volume_grid.hh"
#include "BKE_volume_openvdb.hh"
#include "GEO_mesh_to_volume.hh"
@@ -109,7 +110,7 @@ float volume_compute_voxel_size(const Depsgraph *depsgraph,
return voxel_size / volume_simplify;
}
static openvdb::FloatGrid::Ptr mesh_to_fog_volume_grid(
static openvdb::FloatGrid::Ptr mesh_to_density_grid_impl(
const Span<float3> positions,
const Span<int> corner_verts,
const Span<int3> corner_tris,
@@ -147,14 +148,34 @@ static openvdb::FloatGrid::Ptr mesh_to_fog_volume_grid(
return new_grid;
}
static openvdb::FloatGrid::Ptr mesh_to_sdf_volume_grid(const Span<float3> positions,
const Span<int> corner_verts,
const Span<int3> corner_tris,
const float voxel_size,
const float half_band_width)
bke::VolumeGrid<float> mesh_to_density_grid(const Span<float3> positions,
const Span<int> corner_verts,
const Span<int3> corner_tris,
const float voxel_size,
const float interior_band_width,
const float density)
{
openvdb::FloatGrid::Ptr grid = mesh_to_density_grid_impl(positions,
corner_verts,
corner_tris,
float4x4::identity(),
voxel_size,
interior_band_width,
density);
if (!grid) {
return {};
}
return bke::VolumeGrid<float>(std::move(grid));
}
bke::VolumeGrid<float> mesh_to_sdf_grid(const Span<float3> positions,
const Span<int> corner_verts,
const Span<int3> corner_tris,
const float voxel_size,
const float half_band_width)
{
if (voxel_size <= 0.0f || half_band_width <= 0.0f) {
return nullptr;
return {};
}
std::vector<openvdb::Vec3s> points(positions.size());
@@ -180,7 +201,7 @@ static openvdb::FloatGrid::Ptr mesh_to_sdf_volume_grid(const Span<float3> positi
openvdb::FloatGrid::Ptr new_grid = openvdb::tools::meshToLevelSet<openvdb::FloatGrid>(
*transform, points, triangles, half_band_width);
return new_grid;
return bke::VolumeGrid<float>(std::move(new_grid));
}
bke::VolumeGridData *fog_volume_grid_add_from_mesh(Volume *volume,
@@ -193,27 +214,15 @@ bke::VolumeGridData *fog_volume_grid_add_from_mesh(Volume *volume,
const float interior_band_width,
const float density)
{
openvdb::FloatGrid::Ptr mesh_grid = mesh_to_fog_volume_grid(positions,
corner_verts,
corner_tris,
mesh_to_volume_space_transform,
voxel_size,
interior_band_width,
density);
openvdb::FloatGrid::Ptr mesh_grid = mesh_to_density_grid_impl(positions,
corner_verts,
corner_tris,
mesh_to_volume_space_transform,
voxel_size,
interior_band_width,
density);
return mesh_grid ? BKE_volume_grid_add_vdb(*volume, name, std::move(mesh_grid)) : nullptr;
}
bke::VolumeGridData *sdf_volume_grid_add_from_mesh(Volume *volume,
const StringRefNull name,
const Span<float3> positions,
const Span<int> corner_verts,
const Span<int3> corner_tris,
const float voxel_size,
const float half_band_width)
{
openvdb::FloatGrid::Ptr mesh_grid = mesh_to_sdf_volume_grid(
positions, corner_verts, corner_tris, voxel_size, half_band_width);
return mesh_grid ? BKE_volume_grid_add_vdb(*volume, name, std::move(mesh_grid)) : nullptr;
}
} // namespace blender::geometry
#endif