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110 lines
3.9 KiB
110 lines
3.9 KiB
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/****************************************************************************
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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/Plane.h"
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namespace cc {
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IGeometry plane(ccstd::optional<IPlaneOptions> options) {
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if (!options.has_value()) {
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options = IPlaneOptions();
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}
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const float width = options->width;
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const float length = options->length;
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const uint32_t uSegments = options->widthSegments;
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const uint32_t vSegments = options->lengthSegments;
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const float hw = width * 0.5F;
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const float hl = length * 0.5F;
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ccstd::vector<float> positions;
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ccstd::vector<float> uvs;
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ccstd::vector<uint32_t> indices;
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const Vec3 minPos(-hw, 0, -hl);
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const Vec3 maxPos(hw, 0, hl);
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const float boundingRadius = sqrt(width * width + length * length);
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Vec3 c00(-hw, 0, hl);
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Vec3 c10(hw, 0, hl);
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Vec3 c01(-hw, 0, -hl);
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for (uint32_t y = 0; y <= vSegments; ++y) {
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for (uint32_t x = 0; x <= uSegments; ++x) {
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const float u = static_cast<float>(x) / static_cast<float>(uSegments);
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const float v = static_cast<float>(y) / static_cast<float>(vSegments);
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Vec3 temp1 = c00.lerp(c10, u);
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Vec3 temp2 = c00.lerp(c01, v);
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temp2.subtract(c00);
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temp1.add(temp2);
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positions.emplace_back(temp1.x);
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positions.emplace_back(temp1.y);
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positions.emplace_back(temp1.z);
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if (options->includeUV) {
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uvs.emplace_back(u);
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uvs.emplace_back(v);
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}
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if ((x < uSegments) && (y < vSegments)) {
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const uint32_t uSeg1 = uSegments + 1;
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const uint32_t a = x + y * uSeg1;
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const uint32_t b = x + (y + 1) * uSeg1;
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const uint32_t c = (x + 1) + (y + 1) * uSeg1;
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const uint32_t d = (x + 1) + y * uSeg1;
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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 result;
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result.positions = positions;
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result.boundingRadius = boundingRadius;
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result.minPos = minPos;
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result.maxPos = maxPos;
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result.indices = indices;
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if (options->includeNormal) {
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const uint32_t nVertex = (vSegments + 1) * (uSegments + 1);
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ccstd::vector<float> normals(3 * nVertex);
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for (uint32_t i = 0; i < nVertex; ++i) {
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normals[i * 3 + 0] = 0;
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normals[i * 3 + 1] = 1;
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normals[i * 3 + 2] = 0;
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}
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result.normals = normals;
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}
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if (options->includeUV) {
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result.uvs = uvs;
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}
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return result;
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}
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} // namespace cc
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