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af7059373c
To make sure RecastMesh objects are equal if built with the same data but in different order. Will be used later when there will be more than one place building RecasMesh objects.
49 lines
1.9 KiB
C++
49 lines
1.9 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 DetourNavigator::Mesh& mesh = recastMesh.getMesh();
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const auto normals = calculateNormals(mesh.getVertices(), mesh.getIndices());
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const auto texScale = 1.0f / (settings.mCellSize * 10.0f);
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duDebugDrawTriMesh(&debugDraw, mesh.getVertices().data(), mesh.getVerticesCount(),
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mesh.getIndices().data(), normals.data(), mesh.getTrianglesCount(), nullptr, texScale);
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return group;
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}
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}
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