Merge branch 'main' into nb

Author: petrasvestartas

.gitmodules

@@ -0,0 +1,3 @@
+[submodule "ext/libigl"]
+	path = ext/libigl
+	url = https://github.com/libigl/libigl.git

cmake/FindLIBIGL.cmake

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+# - Try to find the LIBIGL library
+# Once done this will define
+#
+#  LIBIGL_FOUND - system has LIBIGL
+#  LIBIGL_INCLUDE_DIR - **the** LIBIGL include directory
+if(LIBIGL_FOUND)
+    return()
+endif()
+
+find_path(LIBIGL_INCLUDE_DIR igl/readOBJ.h
+    HINTS
+        ENV LIBIGL
+        ENV LIBIGLROOT
+        ENV LIBIGL_ROOT
+        ENV LIBIGL_DIR
+    PATHS
+    	${CMAKE_SOURCE_DIR}/ext/libigl
+        ${CMAKE_SOURCE_DIR}/../..
+        ${CMAKE_SOURCE_DIR}/..
+        ${CMAKE_SOURCE_DIR}
+        ${CMAKE_SOURCE_DIR}/libigl
+        ${CMAKE_SOURCE_DIR}/../libigl
+        ${CMAKE_SOURCE_DIR}/../../libigl
+	    ${CMAKE_SOURCE_DIR}/../ext/libigl
+        /usr
+        /usr/local
+        /usr/local/igl/libigl
+    PATH_SUFFIXES include
+)
+
+include(FindPackageHandleStandardArgs)
+find_package_handle_standard_args(LIBIGL
+    "\nlibigl not found --- You can download it using:\n\tgit clone --recursive https://github.com/libigl/libigl.git ${CMAKE_SOURCE_DIR}/../libigl"
+    LIBIGL_INCLUDE_DIR)
+mark_as_advanced(LIBIGL_INCLUDE_DIR)
+
+list(APPEND CMAKE_MODULE_PATH "${LIBIGL_INCLUDE_DIR}/../cmake")
+include(libigl)

docs/examples/curvature.py

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+import compas
+import compas_libigl as igl
+from compas.colors import Color
+from compas.datastructures import Mesh
+from compas.geometry import Line
+from compas.geometry import Point
+from compas.geometry import Vector
+from compas_viewer import Viewer
+
+# ==============================================================================
+# Input geometry
+# ==============================================================================
+
+mesh = Mesh.from_obj(compas.get("tubemesh.obj"))
+
+trimesh = mesh.copy()
+trimesh.quads_to_triangles()
+
+# ==============================================================================
+# curvature
+# ==============================================================================
+
+curvature = igl.trimesh_gaussian_curvature(trimesh.to_vertices_and_faces())
+
+# ==============================================================================
+# Visualisation
+# ==============================================================================
+
+viewer = Viewer(width=1600, height=900)
+# viewer.view.camera.position = [1, -6, 2]
+# viewer.view.camera.look_at([1, 1, 1])
+
+viewer.scene.add(mesh, opacity=0.7, show_points=False)
+
+for vertex in mesh.vertices():
+    if mesh.is_vertex_on_boundary(vertex):
+        continue
+
+    point = Point(*mesh.vertex_coordinates(vertex))
+    normal = Vector(*mesh.vertex_normal(vertex))
+    c = curvature[vertex]
+    normal.scale(10 * c)
+
+    viewer.scene.add(
+        Line(point, point + normal),
+        linecolor=(Color.red() if c > 0 else Color.blue()),
+        linewidth=2,
+    )
+
+viewer.show()

ext/PLACEHOLDER

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+# https://libigl.github.io/tutorial/#anisotropic-remeshing

ext/libigl

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+# https://libigl.github.io/tutorial/#global-seamless-integer-grid-parametrization

scripts/temp/_anisotroremesh.py

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+# https://libigl.github.io/tutorial/#n-rotationally-symmetric-tangent-fields

scripts/temp/_mixedintquadrang.py

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+# https://libigl.github.io/tutorial/#quadratic-energy-minimization
+# https://libigl.github.io/tutorial/#linear-equality-constraints
+# https://libigl.github.io/tutorial/#quadratic-programming

scripts/temp/_nrosy.py

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+import io
+from os import path
+import os
+import re
+import sys
+import platform
+import subprocess
+
+from setuptools import setup, Extension
+from setuptools.command.build_ext import build_ext
+from distutils.version import LooseVersion
+
+here = path.abspath(path.dirname(__file__))
+
+
+def read(*names, **kwargs):
+    return io.open(
+        path.join(here, *names), encoding=kwargs.get("encoding", "utf8")
+    ).read()
+
+
+class CMakeExtension(Extension):
+    def __init__(self, name, sourcedir=""):
+        Extension.__init__(self, name, sources=[])
+        self.sourcedir = os.path.abspath(sourcedir)
+
+
+class CMakeBuild(build_ext):
+    def run(self):
+        try:
+            out = subprocess.check_output(["cmake", "--version"])
+        except OSError:
+            raise RuntimeError(
+                "CMake must be installed to build the following extensions: "
+                + ", ".join(e.name for e in self.extensions)
+            )
+
+        if platform.system() == "Windows":
+            cmake_version = LooseVersion(
+                re.search(r"version\s*([\d.]+)", out.decode()).group(1)
+            )
+            if cmake_version < "3.1.0":
+                raise RuntimeError("CMake >= 3.1.0 is required on Windows")
+
+        for ext in self.extensions:
+            self.build_extension(ext)
+
+    def build_extension(self, ext):
+        extdir = os.path.abspath(os.path.dirname(self.get_ext_fullpath(ext.name)))
+        cmake_args = [
+            "-DCMAKE_LIBRARY_OUTPUT_DIRECTORY=" + extdir,
+            "-DPYTHON_EXECUTABLE=" + sys.executable,
+        ]
+
+        cfg = "Debug" if self.debug else "Release"
+        build_args = ["--config", cfg]
+
+        if platform.system() == "Windows":
+            cmake_args += [
+                "-DCMAKE_LIBRARY_OUTPUT_DIRECTORY_{}={}".format(cfg.upper(), extdir)
+            ]
+            if sys.maxsize > 2**32:
+                cmake_args += ["-A", "x64"]
+            # build_args += ['--', '/m']
+        else:
+            # # For MacOS.
+            # # During compiling stage, the python module always links to a temporary generated library which is going to be destroyed.
+            # # Then importing the final installed module will return a link error
+            # # The following commands will force the module to look up the its dynmaic linked library in the same folder
+            # cmake_args += [
+            #     '-DCMAKE_INSTALL_RPATH=@loader_path',
+            #     '-DCMAKE_BUILD_WITH_INSTALL_RPATH:BOOL=ON',
+            #     '-DCMAKE_INSTALL_RPATH_USE_LINK_PATH:BOOL=OFF']
+
+            cmake_args += ["-DCMAKE_BUILD_TYPE=" + cfg]
+            build_args += ["--", "-j2"]
+
+        env = os.environ.copy()
+        env["CXXFLAGS"] = '{} -DVERSION_INFO=\\"{}\\"'.format(
+            env.get("CXXFLAGS", ""), self.distribution.get_version()
+        )
+        if not os.path.exists(self.build_temp):
+            os.makedirs(self.build_temp)
+        subprocess.check_call(
+            ["cmake", ext.sourcedir] + cmake_args, cwd=self.build_temp, env=env
+        )
+        subprocess.check_call(
+            ["cmake", "--build", "."] + build_args, cwd=self.build_temp
+        )
+
+
+long_description = read("README.md")
+requirements = read("requirements.txt").split("\n")
+optional_requirements = {}
+
+
+setup(
+    name="compas_libigl",
+    packages=["compas_libigl"],
+    ext_modules=[CMakeExtension("compas_libigl")],
+    cmdclass=dict(build_ext=CMakeBuild),
+)