您好，我对 Carve 有疑问，但我不确定它是否与实施或我的使用有关。
这是显示我遇到的问题的孤立代码。本质上我得到了错误的结果，或者更具体地说，我在结果中得到了一个不正确的顶点vertex_storage。该顶点也包含在面索引中，因此 carve 似乎具有。我已经手动调试并绘制了所有的面，所以确定不应该包括这个顶点。
包含的不应该被突出显示的顶点。
生成的网格显然是错误的。更详细地检查它，其中包含一个错误点vertex_storage，即 (150,150,0)。
由此生成的结果三角形包括错误的顶点 o.0
这是一个非常基本的差异操作，我读过 carve 有一些问题，但我没想到它会像 2 个基本网格（2 个长方体）那样表现，这让我认为这是我做错的事情。
这也令人沮丧，因为在调试第 6 面（网格集 0）时（我假设某些东西是种子/prng），我得到相同的顶点，但几乎总是不同的顺序。
这是证明问题的来源......
#include <carve\mesh.hpp>
#include <carve\csg.hpp>
#include <carve\input.hpp>
#include <Windows.h>
struct MyVector3
{
MyVector3(float x, float y, float z)
: x_(x), y_(y), z_(z)
{
}
float x_;
float y_;
float z_;
};
struct MyVertex
{
MyVertex(unsigned int pointIndex)
: p_(pointIndex)
{
}
unsigned int p_;
// n_, uv_ etc left out for covienience
};
struct MyTriangle
{
MyTriangle(unsigned int a, unsigned int b, unsigned int c)
: a_(a), b_(b), c_(c)
{
}
unsigned int a_;
unsigned int b_;
unsigned int c_;
};
struct MyMesh
{
std::vector<MyVector3> points_;
std::vector<MyTriangle> triangles_;
std::vector<MyVertex> vertices_;
};
carve::mesh::MeshSet<3U>* GetCarveMesh(const MyMesh& originalMesh)
{
carve::input::PolyhedronData data;
for (unsigned int v = 0; v < originalMesh.vertices_.size(); ++v)
{
const MyVector3& point = originalMesh.points_[originalMesh.vertices_[v].p_];
data.addVertex(carve::geom::VECTOR(point.x_, point.y_, point.z_));
}
for (unsigned int t = 0; t < originalMesh.triangles_.size(); t++)
{
const MyTriangle& tri = originalMesh.triangles_[t];
const MyVertex& a = originalMesh.vertices_[tri.a_];
const MyVertex& b = originalMesh.vertices_[tri.b_];
const MyVertex& c = originalMesh.vertices_[tri.c_];
data.addFace(a.p_, b.p_, c.p_);
}
return data.createMesh(carve::input::Options());
}
std::list<std::shared_ptr<MyMesh>> GetMyMesh(carve::mesh::MeshSet<3U>* carveMesh)
{
std::list<std::shared_ptr<MyMesh>> result;
unsigned int meshStart = 0;
unsigned int meshEnd = carveMesh->meshes.size();
for (unsigned int ms = meshStart; ms < meshEnd; ++ms)
{
// For each mesh, construct the faces and add the points as we do.
result.push_back(std::shared_ptr<MyMesh>());
{
std::ostringstream oss;
oss << "mesh " << ms << " has " << carveMesh->meshes[ms]->faces.size() << " faces.\n";
OutputDebugString(oss.str().c_str());
}
unsigned int faceStart = 0;
unsigned int faceEnd = carveMesh->meshes[ms]->faces.size();
for (unsigned int f = faceStart; f < faceEnd; ++f)
{
//if (f == 10 || f == 11 || f == 6)
// continue;
unsigned int vertexCount = carveMesh->meshes[ms]->faces[f]->n_edges;
std::vector<MyVector3> points;
points.reserve(vertexCount);
std::ostringstream oss;
oss << " - face " << f << "(" << vertexCount << ") :\n";
// add each edge in this face... more than 3, then we need to tessellate
carve::mesh::Edge<3>* currentEdge = carveMesh->meshes[ms]->faces[f]->edge;
for (unsigned int e = 0; e < vertexCount; ++e)
{
MyVector3 point(static_cast<float>(currentEdge->vert->v[0]), static_cast<float>(currentEdge->vert->v[1]), static_cast<float>(currentEdge->vert->v[2]));
points.push_back(point);
oss << "[" << e << ":" << point.x_ << ", " << point.y_ << ", " << point.z_ << "]";
oss << "\n";
currentEdge = currentEdge->next;
}
OutputDebugString(oss.str().c_str());
// ... Other operations, tessellation etc
}
}
return result;
}
int main(int argc, char** argv)
{
// define myMeshA
MyMesh myMeshA;
myMeshA.points_.push_back(MyVector3(-150.0f, -150.0f, 0));
myMeshA.points_.push_back(MyVector3(-150.0f, -150.0f, 2800.0f));
myMeshA.points_.push_back(MyVector3(150.0f, 150.0f, 0));
myMeshA.points_.push_back(MyVector3(150.0f, 150.0f, 2800.0f));
myMeshA.points_.push_back(MyVector3(3430.0f, -150.0f, 0));
myMeshA.points_.push_back(MyVector3(3430.0f, -150.0f, 2800.0f));
myMeshA.points_.push_back(MyVector3(3730.0f, 150.0f, 0));
myMeshA.points_.push_back(MyVector3(3730.0f, 150.0f, 2800.0f));
myMeshA.vertices_.push_back(MyVertex(0));
myMeshA.vertices_.push_back(MyVertex(1));
myMeshA.vertices_.push_back(MyVertex(2));
myMeshA.vertices_.push_back(MyVertex(3));
myMeshA.vertices_.push_back(MyVertex(4));
myMeshA.vertices_.push_back(MyVertex(5));
myMeshA.vertices_.push_back(MyVertex(6));
myMeshA.vertices_.push_back(MyVertex(7));
myMeshA.triangles_.push_back(MyTriangle(0, 1, 3));
myMeshA.triangles_.push_back(MyTriangle(3, 2, 0));
myMeshA.triangles_.push_back(MyTriangle(2, 3, 7));
myMeshA.triangles_.push_back(MyTriangle(7, 6, 2));
myMeshA.triangles_.push_back(MyTriangle(6, 7, 5));
myMeshA.triangles_.push_back(MyTriangle(5, 4, 6));
myMeshA.triangles_.push_back(MyTriangle(4, 5, 1));
myMeshA.triangles_.push_back(MyTriangle(1, 0, 4));
myMeshA.triangles_.push_back(MyTriangle(2, 4, 0));
myMeshA.triangles_.push_back(MyTriangle(4, 2, 6));
myMeshA.triangles_.push_back(MyTriangle(3, 5, 1));
myMeshA.triangles_.push_back(MyTriangle(5, 3, 7));
// define myMeshB
MyMesh myMeshB;
myMeshB.points_.push_back(MyVector3(0, 0, 0));
myMeshB.points_.push_back(MyVector3(0, 0, 2100.0f));
myMeshB.points_.push_back(MyVector3(0, 300.0f, 0));
myMeshB.points_.push_back(MyVector3(0, 300.0f, 2100.0f));
myMeshB.points_.push_back(MyVector3(930.0f, 0, 0));
myMeshB.points_.push_back(MyVector3(930.0f, 0, 2100.0f));
myMeshB.points_.push_back(MyVector3(930.0f, 300.0f, 0));
myMeshB.points_.push_back(MyVector3(930.0f, 300.0f, 2100.0f));
myMeshB.vertices_.push_back(MyVertex(0));
myMeshB.vertices_.push_back(MyVertex(1));
myMeshB.vertices_.push_back(MyVertex(2));
myMeshB.vertices_.push_back(MyVertex(3));
myMeshB.vertices_.push_back(MyVertex(4));
myMeshB.vertices_.push_back(MyVertex(5));
myMeshB.vertices_.push_back(MyVertex(6));
myMeshB.vertices_.push_back(MyVertex(7));
myMeshB.triangles_.push_back(MyTriangle(0, 1, 3));
myMeshB.triangles_.push_back(MyTriangle(3, 2, 0));
myMeshB.triangles_.push_back(MyTriangle(2, 3, 7));
myMeshB.triangles_.push_back(MyTriangle(7, 6, 2));
myMeshB.triangles_.push_back(MyTriangle(6, 7, 5));
myMeshB.triangles_.push_back(MyTriangle(5, 4, 6));
myMeshB.triangles_.push_back(MyTriangle(4, 5, 1));
myMeshB.triangles_.push_back(MyTriangle(1, 0, 4));
myMeshB.triangles_.push_back(MyTriangle(2, 4, 0));
myMeshB.triangles_.push_back(MyTriangle(4, 2, 6));
myMeshB.triangles_.push_back(MyTriangle(3, 5, 1));
myMeshB.triangles_.push_back(MyTriangle(5, 3, 7));
std::unique_ptr<carve::mesh::MeshSet<3U>> meshA(GetCarveMesh(myMeshA));
std::unique_ptr<carve::mesh::MeshSet<3U>> meshB(GetCarveMesh(myMeshB));
carve::csg::CSG csg;
std::unique_ptr<carve::mesh::MeshSet<3U>> carveResult(csg.compute(meshA.get(), meshB.get(), carve::csg::CSG::OP::A_MINUS_B));
std::list<std::shared_ptr<MyMesh>> result = GetMyMesh(carveResult.get());
return 0;
}
相关输出
00000020 8.55740356 [12284] mesh 0 has 14 faces.
00000021 8.55764484 [12284] - face 0(6) :
00000022 8.55764484 [12284] [0:-150, -150, 0]
00000023 8.55764484 [12284] [1:-150, -150, 2800]
00000024 8.55764484 [12284] [2:150, 150, 2800]
00000025 8.55764484 [12284] [3:75, 75, 2100]
00000026 8.55764484 [12284] [4:0, 0, 2100]
00000027 8.55764484 [12284] [5:0, 0, 1400]
00000028 8.55826759 [12284] - face 1(3) :
00000029 8.55826759 [12284] [0:0, 0, 0]
00000030 8.55826759 [12284] [1:-150, -150, 0]
00000031 8.55826759 [12284] [2:0, 0, 1400]
00000032 8.55878353 [12284] - face 2(3) :
00000033 8.55878353 [12284] [0:-150, -150, 2800]
00000034 8.55878353 [12284] [1:-150, -150, 0]
00000035 8.55878353 [12284] [2:3430, -150, 0]
00000036 8.55926609 [12284] - face 3(3) :
00000037 8.55926609 [12284] [0:150, 150, 2800]
00000038 8.55926609 [12284] [1:150, 150, 2100]
00000039 8.55926609 [12284] [2:75, 75, 2100]
00000040 8.55982780 [12284] - face 4(5) :
00000041 8.55982780 [12284] [0:930, 78.6585, 0]
00000042 8.55982780 [12284] [1:3430, -150, 0]
00000043 8.55982780 [12284] [2:-150, -150, 0]
00000044 8.55982780 [12284] [3:0, 0, 0]
00000045 8.55982780 [12284] [4:930, 0, 0]
00000046 8.56040192 [12284] - face 5(3) :
00000047 8.56040192 [12284] [0:3430, -150, 0]
00000048 8.56040192 [12284] [1:3430, -150, 2800]
00000049 8.56040192 [12284] [2:-150, -150, 2800]
00000050 8.56112003 [12284] - face 6(13) :
00000051 8.56112003 [12284] [0:930, 150, 2100]
00000052 8.56112003 [12284] [1:465, 150, 2100]
00000053 8.56112003 [12284] [2:150, 150, 2100]
00000054 8.56112003 [12284] [3:150, 150, 2800]
00000055 8.56112003 [12284] [4:3730, 150, 2800]
00000056 8.56112003 [12284] [5:930, 150, 610.056]
00000057 8.56112003 [12284] [6:930, 150, 1050]
00000058 8.56112003 [12284] [7:930, 150, 2100]
00000059 8.56112003 [12284] [8:930, 150, 1050]
00000060 8.56112003 [12284] [9:930, 150, 610.056]
00000061 8.56112003 [12284] [10:150, 150, 0]
00000062 8.56112003 [12284] [11:150, 150, 2100]
00000063 8.56112003 [12284] [12:465, 150, 2100]
00000064 8.56189060 [12284] - face 7(4) :
00000065 8.56189060 [12284] [0:930, 150, 0]
00000066 8.56189060 [12284] [1:3730, 150, 0]
00000067 8.56189060 [12284] [2:3430, -150, 0]
00000068 8.56189060 [12284] [3:930, 78.6585, 0]
00000069 8.56240559 [12284] - face 8(3) :
00000070 8.56240559 [12284] [0:3430, -150, 2800]
00000071 8.56240559 [12284] [1:3430, -150, 0]
00000072 8.56240559 [12284] [2:3730, 150, 0]
00000073 8.56300354 [12284] - face 9(4) :
00000074 8.56300354 [12284] [0:930, 150, 610.056]
00000075 8.56300354 [12284] [1:3730, 150, 2800]
00000076 8.56300354 [12284] [2:3730, 150, 0]
00000077 8.56300354 [12284] [3:930, 150, 0]
00000078 8.56469250 [12284] - face 10(4) :
00000079 8.56469250 [12284] [0:930, 150, 0]
00000080 8.56469250 [12284] [1:465, 150, 0]
00000081 8.56469250 [12284] [2:150, 150, 0]
00000082 8.56469250 [12284] [3:930, 150, 610.056]
00000083 8.56473637 [12284] - face 11(5) :
00000084 8.56473637 [12284] [0:150, 150, 2100]
00000085 8.56473637 [12284] [1:150, 150, 0]
00000086 8.56473637 [12284] [2:0, 0, 0]
00000087 8.56473637 [12284] [3:0, 0, 1400]
00000088 8.56473637 [12284] [4:75, 75, 2100]
00000089 8.56530762 [12284] - face 12(3) :
00000090 8.56530762 [12284] [0:3730, 150, 0]
00000091 8.56530762 [12284] [1:3730, 150, 2800]
00000092 8.56530762 [12284] [2:3430, -150, 2800]
00000093 8.56581879 [12284] - face 13(3) :
00000094 8.56581879 [12284] [0:75, 75, 2100]
00000095 8.56581879 [12284] [1:0, 0, 1400]
00000096 8.56581879 [12284] [2:0, 0, 2100]
00000097 8.56697178 [12284] mesh 1 has 2 faces.
00000098 8.56711102 [12284] - face 0(3) :
00000099 8.56711102 [12284] [0:150, 150, 2800]
00000100 8.56711102 [12284] [1:3430, -150, 2800]
00000101 8.56711102 [12284] [2:-150, -150, 2800]
00000102 8.56761074 [12284] - face 1(3) :
00000103 8.56761074 [12284] [0:3430, -150, 2800]
00000104 8.56761074 [12284] [1:150, 150, 2800]
00000105 8.56761074 [12284] [2:3730, 150, 2800]
在面顶点的相关输出中。不应包含 veretx (150,150,0)，但正如您所见，它包含在 3 个面中......（面 6、10 和 11）。这会导致不正确的细分。
这里发生了什么？是我使用雕刻的方式，还是雕刻本身的问题。任何帮助，将不胜感激 ：）