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/* SPDX-License-Identifier: GPL-2.0-or-later */
/** \file
* \ingroup stl
*/
#pragma once
#include <cstdint>
#include "BLI_math_vec_types.hh"
#include "BLI_set.hh"
#include "BLI_vector.hh"
#include "BLI_vector_set.hh"
#include "DNA_mesh_types.h"
namespace blender::io::stl {
class Triangle {
public:
int v1, v2, v3;
/* Based on an old version of Python's frozen-set hash
* https://web.archive.org/web/20220520211017/https://stackoverflow.com/questions/20832279/python-frozenset-hashing-algorithm-implementation
*/
uint64_t hash() const
{
uint64_t res = 1927868237UL;
res *= 4;
res ^= (v1 ^ (v1 << 16) ^ 89869747UL) * 3644798167UL;
res ^= (v2 ^ (v2 << 16) ^ 89869747UL) * 3644798167UL;
res ^= (v3 ^ (v3 << 16) ^ 89869747UL) * 3644798167UL;
return res * 69069U + 907133923UL;
}
friend bool operator==(const Triangle &a, const Triangle &b)
{
bool i = (a.v1 == b.v1) && (a.v2 == b.v2) && (a.v3 == b.v3);
bool j = (a.v1 == b.v1) && (a.v3 == b.v2) && (a.v2 == b.v3);
bool k = (a.v2 == b.v1) && (a.v1 == b.v2) && (a.v3 == b.v3);
bool l = (a.v2 == b.v1) && (a.v3 == b.v2) && (a.v1 == b.v3);
bool m = (a.v3 == b.v1) && (a.v1 == b.v2) && (a.v2 == b.v3);
bool n = (a.v3 == b.v1) && (a.v2 == b.v2) && (a.v1 == b.v3);
return i || j || k || l || m || n;
}
};
class STLMeshHelper {
private:
VectorSet<float3> m_verts;
VectorSet<Triangle> m_tris;
Vector<float3> m_loop_normals;
int m_num_degenerate_tris;
int m_num_duplicate_tris;
const bool m_use_custom_normals;
public:
STLMeshHelper(int num_tris, bool use_custom_normals);
/* Creates a new triangle from specified vertex locations,
* duplicate vertices and triangles are merged.
*/
bool add_triangle(const float3 &a, const float3 &b, const float3 &c);
void add_triangle(const float3 &a,
const float3 &b,
const float3 &c,
const float3 &custom_normal);
Mesh *to_mesh(Main *bmain, char *mesh_name);
};
} // namespace blender::io::stl
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