This library provides implicit function and its gradient evaulation for the following:
- Common analytical primitives (spheres, cylinders, cones, etc.)
- Implicit function generated from point cloud using Variational Implicit Point Set Surface (VIPSS)
- Implicit shape defined via WGSL shaders (requires the
-DIMPLICIT_FUNCTIONS_WITH_SHADER_SUPPORTflag)
mkdir build
cd build
cmake ..
# or
cmake .. -DIMPLICIT_FUNCTIONS_WITH_SHADER_SUPPORT=ON # to enable shader support
make -j8Primitives are defined by a set of shape-specific parameters stored in a JSON file. Multiple functions can be stored in the same JSON file. For example, a sphere centered at the origin with radius 1 is defined as:
{
"sphere": {
"type": "sphere",
"center": [0.0, 0.0, 0.0],
"radius": 1.0
}
}See primitives for a list of example specifications.
VIPSS function are defined by a set of points and their radial basis function (RBF) coefficients. Both can be generated using the VIPSS codebase. Here is an example specification:
{
"vipss": {
"type": "vipss",
"points": "points_file.xyz",
"rbf_coeffs": "coeffs_file.txt"
}
}Shader-based implicit functions take in a shader file and a parameter, detla, for finite-difference approximation of the gradients. Here is an example spe 503D cification:
{
"shader": {
"type": "shader",
"shader": "key.wgsl",
"delta": 1e-3
}
}