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engine/3d/src/MeshBuilder.hpp

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+/**
+  @file MeshBuilder.h
+
+  @maintainer Morgan McGuire, http://graphics.cs.williams.edu
+
+  @created 2002-02-27
+  @edited  2004-10-04
+ */
+#ifndef G3D_MESHBUILDER_H
+#define G3D_MESHBUILDER_H
+
+#include "platform.hpp"
+#include "Array.hpp"
+#include "Vector3.hpp"
+#include "Triangle.hpp"
+
+namespace G3D
+{
+
+/**
+ Allows creation of optimized watertight meshes from unoptimized polygon soups.
+ See also G3D::MeshAlg for algorithms that operate on the output.
+ */
+class MeshBuilder
+{
+public:
+    /**
+     Set setWeldRadius to AUTO_WELD to weld vertices closer than 1/2
+     the smallest edge length in a model.
+     */
+    enum
+    {
+        AUTO_WELD = -100
+    };
+
+private:
+    /** Indices of vertices in <B>or near</B>  a grid cell. */
+    typedef Array<int> List;
+
+    std::string name;
+
+    /**
+     All of the triangles, as a long triangle list.
+     */
+    Array<Vector3> triList;
+
+    void centerTriList();
+    void computeBounds(Vector3& min, Vector3& max);
+
+    bool _twoSided;
+
+    /** Collapse radius */
+    double close;
+
+public:
+    inline MeshBuilder(bool twoSided = false)
+        : _twoSided(twoSided)
+        , close(AUTO_WELD)
+    {
+    }
+
+    /** Writes the model to the arrays, which can then be used with
+        G3D::IFSModel::save and G3D::MeshAlg */
+    void commit(std::string& name, Array<int>& indexArray, Array<Vector3>& vertexArray);
+
+    /**
+     Adds a new triangle to the model. (Counter clockwise)
+     */
+    void addTriangle(const Vector3& a, const Vector3& b, const Vector3& c);
+
+    /**
+     Adds two new triangles to the model. (Counter clockwise)
+     */
+    void addQuad(const Vector3& a, const Vector3& b, const Vector3& c, const Vector3& d);
+
+    void addTriangle(const Triangle& t);
+
+    void setName(const std::string& n);
+
+    /** Vertices within this distance are considered identical.
+        Use AUTO_WELD (the default) to have the distance be a function of the model size.*/
+    void setWeldRadius(double r)
+    {
+        close = r;
+    }
+};
+
+} // namespace G3D
+
+#endif