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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.
*/
#pragma once
#include "BKE_attribute_access.hh"
struct Mesh;
struct MLoopTri;
namespace blender::nodes {
Span<MLoopTri> get_mesh_looptris(const Mesh &mesh);
enum class eAttributeMapMode {
INTERPOLATED,
NEAREST,
};
/**
* A utility class that performs attribute interpolation from a source mesh.
*
* The interpolator is only valid as long as the mesh is valid.
* Barycentric weights are needed when interpolating point or corner domain attributes,
* these are computed lazily when needed and re-used.
*/
class AttributeInterpolator {
private:
const Mesh *mesh_;
const Span<float3> positions_;
const Span<int> looptri_indices_;
Array<float3> bary_coords_;
Array<float3> nearest_weights_;
public:
AttributeInterpolator(const Mesh *mesh,
const Span<float3> positions,
const Span<int> looptri_indices);
void sample_attribute(const blender::bke::ReadAttributeLookup &src_attribute,
blender::bke::OutputAttribute &dst_attribute,
eAttributeMapMode mode);
protected:
Span<float3> ensure_barycentric_coords();
Span<float3> ensure_nearest_weights();
};
} // namespace blender::nodes
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