added shapes/Cyl, needs finishing

git-svn-id: svn://anubis/fart/trunk@130 7f9b0f55-74a9-4bce-be96-3c2cd072584d

shapes/Cyl.cc

@@ -0,0 +1,57 @@
+
+#include "Cyl.h"
+#include "util/Solver.h"
+#include <math.h>
+#include <iostream>
+using namespace std;
+
+#define FP_EQUAL(x,y) (fabs((x)-(y)) < 0.000001)
+
+Cyl::Cyl(double bottom_radius, double top_radius, double height)
+{
+    m_bottom_radius = fabs(bottom_radius);
+    m_bottom_radius_2 = bottom_radius * bottom_radius;
+    m_top_radius = fabs(top_radius);
+    m_top_radius_2 = top_radius * top_radius;
+    m_height = fabs(height);
+    if (m_height == 0.0)
+        m_height = 1.0;
+}
+
+Shape::IntersectList Cyl::intersect(const Ray & ray)
+{
+    Ray ray_inv = m_inverse.transform_ray(ray);
+
+    IntersectList res;
+    /*
+     * Ray equation:   R = R0 + tRd
+     *                 x = R0x + tRdx
+     *                 y = R0y + tRdy
+     *                 z = R0z + tRdz
+     * Side equation:  x^2 + y^2 = 
+     * Combined:       
+     */
+
+    return res;
+}
+
+Vector Cyl::getNormalAt(const Vector & pt)
+{
+    Vector local_pt = m_inverse.transform_point(pt);
+
+    Vector normal;
+
+    if      ( FP_EQUAL(local_pt[2],  0.0) && m_bottom_radius > 0.0 )
+    {
+        normal = Vector(0, 0, -1);
+    }
+    else if ( FP_EQUAL(local_pt[2], m_height) && m_top_radius > 0.0 )
+    {
+        normal = Vector(0, 0, 1);
+    }
+    else
+    {
+    }
+
+    return m_transform.transform_normal(normal);
+}

shapes/Cyl.h

@@ -0,0 +1,23 @@
+
+#ifndef CYL_H
+#define CYL_H CYL_H
+
+#include "Shape.h"
+
+class Cyl : public Shape
+{
+    public:
+        Cyl(double bottom_radius, double top_radius, double height);
+        IntersectList intersect(const Ray & ray);
+        Vector getNormalAt(const Vector & pt);
+
+    protected:
+        double m_bottom_radius;
+        double m_bottom_radius_2;
+        double m_top_radius;
+        double m_top_radius_2;
+        double m_height;
+};
+
+#endif
+