compute_principal_curvatures.h

/*
 * Copyright 2026 Adobe. All rights reserved.
 * This file is licensed to you under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License. You may obtain a copy
 * of the License at http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software distributed under
 * the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR REPRESENTATIONS
 * OF ANY KIND, either express or implied. See the License for the specific language
 * governing permissions and limitations under the License.
 */
#pragma once
 
#include <lagrange/SurfaceMesh.h>
#include <lagrange/polyddg/DifferentialOperators.h>
#include <lagrange/polyddg/api.h>
 
#include <string_view>
 
namespace lagrange::polyddg {


struct PrincipalCurvaturesOptions
{
    std::string_view kappa_min_attribute = "@kappa_min";

    std::string_view kappa_max_attribute = "@kappa_max";

    std::string_view direction_min_attribute = "@principal_direction_min";

    std::string_view direction_max_attribute = "@principal_direction_max";
};

struct PrincipalCurvaturesResult
{
    AttributeId kappa_min_id = invalid_attribute_id();

    AttributeId kappa_max_id = invalid_attribute_id();

    AttributeId direction_min_id = invalid_attribute_id();

    AttributeId direction_max_id = invalid_attribute_id();
};

template <typename Scalar, typename Index>
LA_POLYDDG_API PrincipalCurvaturesResult compute_principal_curvatures(
    SurfaceMesh<Scalar, Index>& mesh,
    const DifferentialOperators<Scalar, Index>& ops,
    PrincipalCurvaturesOptions options = {});

template <typename Scalar, typename Index>
LA_POLYDDG_API PrincipalCurvaturesResult compute_principal_curvatures(
    SurfaceMesh<Scalar, Index>& mesh,
    PrincipalCurvaturesOptions options = {});

 
} // namespace lagrange::polyddg