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98 lines
3.8 KiB
98 lines
3.8 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/Torus.h"
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namespace cc {
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IGeometry torus(float radius, float tube, const ccstd::optional<ITorusOptions> &opts) {
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const uint32_t radialSegments = opts.has_value() ? opts->radialSegments : 32;
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const uint32_t tubularSegments = opts.has_value() ? opts->tubularSegments : 32;
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const float arc = opts.has_value() ? opts->arc : math::PI_2;
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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 - tube, -tube, -radius - tube);
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const Vec3 maxPos(radius + tube, tube, radius + tube);
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const float boundingRadius = radius + tube;
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for (uint32_t j = 0; j <= radialSegments; j++) {
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for (uint32_t i = 0; i <= tubularSegments; i++) {
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const float u = static_cast<float>(i) / static_cast<float>(tubularSegments);
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const float v = static_cast<float>(j) / static_cast<float>(radialSegments);
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const float u1 = u * arc;
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const float v1 = v * math::PI_2;
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// vertex
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const float x = (radius + tube * cos(v1)) * sin(u1);
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const float y = tube * sin(v1);
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const float z = (radius + tube * cos(v1)) * cos(u1);
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// this vector is used to calculate the normal
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const float nx = sin(u1) * cos(v1);
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const float ny = sin(v1);
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const float nz = cos(u1) * cos(v1);
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positions.emplace_back(x);
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positions.emplace_back(y);
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positions.emplace_back(z);
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normals.emplace_back(nx);
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normals.emplace_back(ny);
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normals.emplace_back(nz);
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uvs.emplace_back(u);
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uvs.emplace_back(v);
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if ((i < tubularSegments) && (j < radialSegments)) {
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const uint32_t seg1 = tubularSegments + 1;
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const uint32_t a = seg1 * j + i;
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const uint32_t b = seg1 * (j + 1) + i;
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const uint32_t c = seg1 * (j + 1) + i + 1;
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const uint32_t d = seg1 * j + i + 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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