54 lines
1.2 KiB
C
54 lines
1.2 KiB
C
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#ifndef NXS_NORMALS_CONE_H
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#define NXS_NORMALS_CONE_H
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#include <vector>
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#include <vcg/space/point3.h>
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#include <vcg/space/sphere3.h>
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namespace nxs {
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//anchored normal cone.
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class ANCone3f {
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public:
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ANCone3f();
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bool Frontface(const vcg::Point3f &viewPoint);
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bool Backface(const vcg::Point3f &viewPoint);
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//threshold [0, 1]: percentage of normals to left out
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void AddNormals(std::vector<vcg::Point3f> &normals,
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float threshold = 1.0f);
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void AddNormals(std::vector<vcg::Point3f> &normals,
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std::vector<float> &areas,
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float threshold = 1.0f);
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void AddAnchors(std::vector<vcg::Point3f> &anchors);
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protected:
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vcg::Point3f scaledNormal;
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vcg::Point3f frontAnchor;
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vcg::Point3f backAnchor;
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friend class NCone3s;
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};
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//this is not anchored... need a bounding sphere to report something
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class NCone3s {
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public:
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void Import(const ANCone3f &c);
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bool Backface(const vcg::Sphere3f &sphere,
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const vcg::Point3f &view) const;
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bool Frontface(const vcg::Sphere3f &sphere,
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const vcg::Point3f &view) const;
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//encode normal and sin(alpha) in n[3]
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short n[4];
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};
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}
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#endif
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