98 lines
3.7 KiB
98 lines
3.7 KiB
/****************************************************************************
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Copyright (c) 2021-2023 Xiamen Yaji Software Co., Ltd.
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http://www.cocos.com
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal
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in the Software without restriction, including without limitation the rights to
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use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
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of the Software, and to permit persons to whom the Software is furnished to do so,
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subject to the following conditions:
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The above copyright notice and this permission notice shall be included in
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all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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THE SOFTWARE.
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****************************************************************************/
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#include "primitive/Sphere.h"
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namespace cc {
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IGeometry sphere(float radius, const ccstd::optional<ISphereOptions> &opts) {
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const uint32_t segments = opts.has_value() ? opts->segments : 32;
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// lat === latitude
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// lon === longitude
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ccstd::vector<float> positions;
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ccstd::vector<float> normals;
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ccstd::vector<float> uvs;
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ccstd::vector<uint32_t> indices;
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const Vec3 minPos(-radius, -radius, -radius);
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const Vec3 maxPos(radius, radius, radius);
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const float boundingRadius = radius;
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for (uint32_t lat = 0; lat <= segments; lat++) {
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const float theta = static_cast<float>(lat) * math::PI / static_cast<float>(segments);
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const float sinTheta = sin(theta);
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const float cosTheta = -cos(theta);
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for (uint32_t lon = 0; lon <= segments; ++lon) {
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const float phi = static_cast<float>(lon) * 2.F * math::PI / static_cast<float>(segments) - math::PI / 2.F;
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const float sinPhi = sin(phi);
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const float cosPhi = cos(phi);
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const float x = sinPhi * sinTheta;
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const float y = cosTheta;
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const float z = cosPhi * sinTheta;
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const float u = static_cast<float>(lon) / static_cast<float>(segments);
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const float v = static_cast<float>(lat) / static_cast<float>(segments);
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positions.emplace_back(x * radius);
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positions.emplace_back(y * radius);
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positions.emplace_back(z * radius);
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normals.emplace_back(x);
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normals.emplace_back(y);
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normals.emplace_back(z);
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uvs.emplace_back(u);
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uvs.emplace_back(v);
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if ((lat < segments) && (lon < segments)) {
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const uint32_t seg1 = segments + 1;
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const uint32_t a = seg1 * lat + lon;
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const uint32_t b = seg1 * (lat + 1) + lon;
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const uint32_t c = seg1 * (lat + 1) + lon + 1;
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const uint32_t d = seg1 * lat + lon + 1;
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indices.emplace_back(a);
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indices.emplace_back(d);
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indices.emplace_back(b);
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indices.emplace_back(d);
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indices.emplace_back(c);
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indices.emplace_back(b);
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}
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}
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}
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IGeometry info;
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info.positions = positions;
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info.normals = normals;
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info.uvs = uvs;
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info.boundingRadius = boundingRadius;
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info.minPos = minPos;
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info.maxPos = maxPos;
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info.indices = indices;
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return info;
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}
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} // namespace cc
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