41 lines
1.5 KiB
C++
41 lines
1.5 KiB
C++
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// Jolt Physics Library (https://github.com/jrouwe/JoltPhysics)
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// SPDX-FileCopyrightText: 2022 Jorrit Rouwe
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// SPDX-License-Identifier: MIT
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#include <TestFramework.h>
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#include <Utils/ShapeCreator.h>
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namespace ShapeCreator {
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ShapeRefC CreateTorusMesh(float inTorusRadius, float inTubeRadius, uint inTorusSegments, uint inTubeSegments)
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{
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uint cNumVertices = inTorusSegments * inTubeSegments;
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// Create torus
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MeshShapeSettings mesh;
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mesh.mTriangleVertices.reserve(cNumVertices);
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mesh.mIndexedTriangles.reserve(cNumVertices * 2);
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for (uint torus_segment = 0; torus_segment < inTorusSegments; ++torus_segment)
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{
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Mat44 rotation = Mat44::sRotation(Vec3::sAxisY(), float(torus_segment) * 2.0f * JPH_PI / inTorusSegments);
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for (uint tube_segment = 0; tube_segment < inTubeSegments; ++tube_segment)
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{
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// Create vertices
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float tube_angle = float(tube_segment) * 2.0f * JPH_PI / inTubeSegments;
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Vec3 pos = rotation * Vec3(inTorusRadius + inTubeRadius * Sin(tube_angle), inTubeRadius * Cos(tube_angle), 0);
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Float3 v;
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pos.StoreFloat3(&v);
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mesh.mTriangleVertices.push_back(v);
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// Create indices
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uint start_idx = torus_segment * inTubeSegments + tube_segment;
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mesh.mIndexedTriangles.emplace_back(start_idx, (start_idx + 1) % cNumVertices, (start_idx + inTubeSegments) % cNumVertices);
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mesh.mIndexedTriangles.emplace_back((start_idx + 1) % cNumVertices, (start_idx + inTubeSegments + 1) % cNumVertices, (start_idx + inTubeSegments) % cNumVertices);
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}
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}
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return mesh.Create().Get();
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}
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};
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