mlivesu / cinolib Goto Github PK

Hi, Is there a build in way to save surface as an .stl file with its normals oriented outwards?

Hi!
Is there a way to associate some metadata with tetrahedrons in Tetmesh?
E.g I have 2 Tetmeshes:

For each tetrahedron in tetmesh1 I need to store the same thermal conductivity which equals X, and for each tetrahedron in tetmesh2 I need to store the same thermal conductivity which equals Y.

Files predicates.h/cpp

Functions

       double orient2d(const double * pa, const double * pb, const double * pc);
       double orient3d(const double * pa, const double * pb, const double * pc, const double * pd);

are implemented if and only if CINOLIB_USES_EXACT_PREDICATES are not defined.

If CINOLIB_USES_EXACT_PREDICATES is defined, building errors occur : Undefined reference to orient2d' / orient3d'.

Hello,

While I was able to run most of the example, I am unable to see sharp edges in the example 23. The value on the webpage is set to 60 which I also did (on the same example), but nothing changed.

Hi,
When I try to compile LoopyCuts, I got a error from cinolib, the error is shown blow.
In file included from ./definitions.h:30: In file included from ../lib/cinolib/include/cinolib/meshes/meshes.h:49: In file included from ../lib/cinolib/include/cinolib/meshes/hexmesh.h:124: ../lib/cinolib/include/cinolib/meshes/hexmesh.cpp:405:19: error: no member named 'update_hex_quality' in 'cinolib::Hexmesh<cinolib::Mesh_std_attributes, MV, ME, MF, MP>' this->update_hex_quality(pid); ~~~~ ^ export_helper.cpp:37:12: note: in instantiation of member function 'cinolib::Hexmesh<cinolib::Mesh_std_attributes, MV, ME, MF, MP>::poly_fix_orientation' requested here hm.poly_fix_orientation(); // meta mesh does not have globally consistent winding numbers... ^ In file included from export_helper.cpp:27: In file included from ./export_helper.h:30: In file included from ./state.h:36: In file included from ./definitions.h:30: In file included from ../lib/cinolib/include/cinolib/meshes/meshes.h:49: In file included from ../lib/cinolib/include/cinolib/meshes/hexmesh.h:124: ../lib/cinolib/include/cinolib/meshes/hexmesh.cpp:415:19: error: no member named 'update_hex_quality' in 'cinolib::Hexmesh<cinolib::Mesh_std_attributes, MV, ME, MF, MP>' this->update_hex_quality(); ~~~~ ^ 21 warnings and 2 errors generated. make: *** [export_helper.o] Error 1

I tried to search the function in 3D5378, But I can not find this function.
Any suggestion?
Thank you.

hi，I am trying to implement the QEM with cinolib, here is my question
I stored vid pair to collapse in the priority queue like this

struct contract {
	double cost, x, y, z;
	unit vid1, vid2;
}

I noticed that when deleting elements, the switch_id function will execute, causing the element id switch with last id, rendering the contract operation related to the last vid invalid. How can i solve this problem

Reading your paper Optimal Dual Schemes for Adaptive Grid Based Hexmeshing, it mentions that it's implemented in cinolib (in hex_transition_schemes.h), but does cinolib come "with batteries included" for obtaining a fully automatic hexmesh from, for example, a trimesh stored in OBJ? I'm asking this question because I found the repository used for the paper (https://github.com/cg3hci/Gen-Adapt-Ref-for-Hexmeshing) but however that code has quite a few external dependencies that I'd like to avoid.

If cinolib has all the necessary stuff, can you show some example for hexmeshing a triangle mesh? (I suppose the first step would be generating an adaptive grid, but that can be done with cinolib as well, can't it?

Win10, Qt5.10, vs2017, 02_base_app_quadmesh.pro

There are lots of compile error about GL.h(Windows Kits\10\Include\10.0.17134.0\um\gl\GL.h), I think it is a question.

Hello,

The most important example (remesher) fails:

22_remesher.pro main.cpp main.o Makefile remesher
csverma@blackhole:$ ./remesher ~/Disk/DataSets/Chair.off
new mesh 147428V / 444576E / 296384P
388249 edges longer than 0.0430667 were split.
142714 edges shorter than 0.02584 were collapsed.
250670 edge flip were performed to normalize vertex valence to 6
tangential smoothing
Remesh iteration [10.939885s]
1122279 edges longer than 0.0430667 were split.
231838 edges shorter than 0.02584 were collapsed.
remesher: ../../include/cinolib/meshes/abstract_polygonmesh.cpp:1347: uint cinolib::AbstractPolygonMesh<M, V, E, P>::poly_add(const std::vector<unsigned int, std::allocator >&) [with M = cinolib::Mesh_std_attributes; V = cinolib::Vert_std_attributes; E = cinolib::Edge_std_attributes; P = cinolib::Polygon_std_attributes; uint = unsigned int]: Assertion `poly_id(vlist)==-1' failed.
Aborted (core dumped)

I've compiled cinolub successfuly,but ImGUI control cannot be visible,What's wrong? other is OK

First of all, thank you for this great project! It spared me a lot of trouble during my research.

I was investigating the duality of the meshes from the example 13, m_tet and m_poly.

I observed every edge from the m_tet mesh and its corresponding face from the m_poly mesh (shared face between edge points). I realized that:

• the face is not perpendicular to the edge and
• the face is not always planar

Is that a desired behaviour? Am I doing it wrong?

This is the code snippet I inserted into the example code for the purpose of this analysis:

    for (int i=0; i<m_tet.num_edges(); ++i)
      {
	std::vector<uint> vert_ids = m_tet.edge_vert_ids(i);
	uint fid = m_poly.poly_shared_face(vert_ids.at(0), vert_ids.at(1));

	std::vector<vec3d> edgev = m_tet.edge_verts(i);
	std::vector<vec3d> facev = m_poly.face_verts(fid);

	std::ofstream edgeout ("/tmp/cino/edge-" + std::to_string(i) + ".txt");
	for (auto v: edgev)
	    edgeout << v.x() << " " << v.y() << " " << v.z() << "\n";
	std::ofstream faceout ("/tmp/cino/face-" + std::to_string(i) + ".txt");
	for (auto v: facev)
	    faceout << v.x() << " " << v.y() << " " << v.z() << "\n";
      }

And some screenshots from Paraview:

Thanks for putting this great library together @mlivesu!

I'm trying to adopt it to terrain modelling applications where curve-based mesh manipulation is a common task.

Consider this example. Given a terrain mesh and a curve in arbitrary 3d space:

Embed the curve into the mesh:

Do you have any suggestions on how to approach it?

Hello,

I have linking errors (VS 2017, WIn10), when building examples, related to imgui lib:
Do you have an idea ?

Thank you

I want to achieve a simple subdivision schme on hexmesh. I think the ‘'hex_transition_install’' function may help me a lot.But i don't know which verts should be set to true in transition_verts. Is there any examples?

I cannot find a CMakeLists.txt under cinolib to cmake/make and thus cannot build examples. How to generate **so and *.a of the cinolib? Thanks.

Hello,

i would like to compute the covered area by a triangle mesh A on a second mesh B (made of either triangles or quads). Expected output is the covering ratio for each mesh B element.

I was wondering of your shadow casting (OpenGL) could be used for that need, and if yes how ?

thank you

Having a 3D triangular surface mesh is it possible to offset it by a specified distance preserving its sharp edges with cinolib?

it seems many intersections when I slicing a .mesh file using 05_hexmesh_viewer

bunny_projected.zip

Hello,

thank you very much for your tremendous work on this library!
Would it be possible to add support for semantic versioning?
I know that there is the 1.0 tag. However, it seems to be out of date.

Hi, I would like to cut a volume mesh based a level set embedded on its vertices (at isovalue zero). To do so I have tried implementing it as seem bellow. While it compiles and runs without issues the mesh is not being split. I am probably missing something pretty trivial but I can’t seem figure out what it is. Hopefully you can shed some light on it.

std::vector<double> isovalues;
for (uint vid=1; vid<MyTetMesh.num_verts(); ++vid) {
    // Get coordinates of current point
    vec3d point = MyTetMesh.vert(vid);
    Point p(point.x(), point.y(), point.z());

    // Compute isovalue for current point
    double isovalue = my_function(p);
    isovalues.push_back(isovalue);
}

// Copy the field on the mesh?
ScalarField f = ScalarField(isovalues);
f.copy_to_mesh(MyTetMesh);

// Slice the mesh?
MeshSlicer ss;
ss.Z_thresh = 0;
ss.slice(MyTetMesh);

Havig two two sided textured OBJs, how one would be capable to merge and substract one from another combining textures in a new surface object? #

@mlivesu I think we should supply an option swifting between perspective and orthographic. Orthographic is mostly used in Engineer and CAD/CAE. What about you?

possible to cut mesh with set of 3d points on it.
if possible , example ??

like cinolib we could have more interfaces for CAX software, if we have interfaces, comments and the books, if we use nanogpt, maybe we could train an AI assistant?

Hello Marco,

How can we store the colors painted on a model using surface_painter tool?

Regards

my boost version is 1.80,and it popup error when run sliced_CLI_loader,how to solve it,thanks

Hello,
This repository was suggested to me by github and I just read the readme.
Looking at your research oriented list of mesh libraries, I wanted to suggest you CGOGN_2 and CGoGN_3 as "unified data structure for multiple dimension handling".
In fact, these libraries implement a mesh data structure (based on a theoretical model) that can handle 0D, 1D, 2D and 3D oriented open or closed manifolds whatever their discretization (polygons or polyhedrons). There is also a cgal package based on the same theoretical data model that can handle nD objects. A while ago we made some benchmarks also.

Hello,

Do you think it would be possible to add soft shadows effects to the rendering system of Cinolib viewer ? Or do we have to send request to glfw ?

thank you.

If the selected elements could be shown or hidden, The inside of the model could be seen. It is useful for some applications. Will cinolib add the mouse selction api or functions? For example

1. Interactive rectangle selection of nodes or elements;
2. Hiding the selected nodes and elements.
   

Hi, I would like to use remesh_Botsch_Kobbelt_2004 to remesh a surface using the api. The issue I am having is that remesh_Botsch_Kobbelt_2004 seems to require a DrawableTrimesh which in turn is dependent on gl (my understanding is that gl is required for the GUI stuff, which I am not interested in). Is there a way of using remesh_Botsch_Kobbelt_2004 without needing gl?

I tried using hex_transition_install. It seems the function calls 'transform' and 'bake_rotation_matrix' in hex_transition_orient.cpp are not defined.