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49 lines
1.8 KiB
C++
49 lines
1.8 KiB
C++
#include "navmesh.hpp"
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#include "detourdebugdraw.hpp"
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#include <components/detournavigator/settings.hpp>
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#include <components/detournavigator/recastmesh.hpp>
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#include <RecastDebugDraw.h>
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#include <osg/Group>
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namespace
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{
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std::vector<float> calculateNormals(const std::vector<float>& vertices, const std::vector<int>& indices)
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{
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std::vector<float> result(indices.size());
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for (std::size_t i = 0, n = indices.size(); i < n; i += 3)
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{
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const float* v0_ptr = &vertices[indices[i] * 3];
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const float* v1_ptr = &vertices[indices[i + 1] * 3];
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const float* v2_ptr = &vertices[indices[i + 2] * 3];
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const osg::Vec3f v0(v0_ptr[0], v0_ptr[1], v0_ptr[2]);
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const osg::Vec3f v1(v1_ptr[0], v1_ptr[1], v1_ptr[2]);
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const osg::Vec3f v2(v2_ptr[0], v2_ptr[1], v2_ptr[2]);
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const osg::Vec3f e0 = v1 - v0;
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const osg::Vec3f e1 = v2 - v0;
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osg::Vec3f normal = e0 ^ e1;
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normal.normalize();
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for (std::size_t j = 0; j < 3; ++j)
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result[i + j] = normal[j];
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}
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return result;
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}
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}
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namespace SceneUtil
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{
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osg::ref_ptr<osg::Group> createRecastMeshGroup(const DetourNavigator::RecastMesh& recastMesh,
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const DetourNavigator::Settings& settings)
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{
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const osg::ref_ptr<osg::Group> group(new osg::Group);
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DebugDraw debugDraw(*group, osg::Vec3f(0, 0, 0), 1.0f / settings.mRecastScaleFactor);
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const auto normals = calculateNormals(recastMesh.getVertices(), recastMesh.getIndices());
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const auto texScale = 1.0f / (settings.mCellSize * 10.0f);
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duDebugDrawTriMesh(&debugDraw, recastMesh.getVertices().data(), recastMesh.getVerticesCount(),
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recastMesh.getIndices().data(), normals.data(), recastMesh.getTrianglesCount(), nullptr, texScale);
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return group;
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}
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}
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