From e8fd42f81f847bb199a4fad9b1b1a7b7d598a97f Mon Sep 17 00:00:00 2001
From: Josh Holtrop <jholtrop+git@gmail.com>
Date: Tue, 27 Jan 2009 00:11:14 +0000
Subject: [PATCH] broke traceRay() out into getRayHits()

git-svn-id: svn://anubis/fart/trunk@51 7f9b0f55-74a9-4bce-be96-3c2cd072584d
---
 main/Scene.cc  | 45 +++++++++++++++++++++++++++++++++++----------
 main/Scene.h   |  8 ++++++++
 shapes/Shape.h |  4 ++++
 util/Color.cc  |  2 +-
 4 files changed, 48 insertions(+), 11 deletions(-)

diff --git a/main/Scene.cc b/main/Scene.cc
index 8e17bca..f050f73 100644
--- a/main/Scene.cc
+++ b/main/Scene.cc
@@ -2,11 +2,14 @@
 #include "Scene.h"
 #include <stdlib.h>
 #include <string>
+#include <vector>
+#include <utility>
 #include <map>
 #include <math.h>
 #include "BMP.h"
 #include "shapes/Shape.h"
 #include "shapes/Sphere.h"
+#include "PointLight.h"
 using namespace std;
 
 Scene::Scene(map<string, const char *> options,
@@ -70,6 +73,12 @@ Scene::~Scene()
     {
         delete (*it);
     }
+    for (vector<Light *>::iterator it = m_lights.begin();
+         it != m_lights.end();
+         it++)
+    {
+        delete (*it);
+    }
 }
 
 void Scene::load(const char * filename)
@@ -79,6 +88,9 @@ void Scene::load(const char * filename)
     m_transform.translate(1.0, 5.0, 0.5);
     shape->setTransform(m_transform);
     m_shapes.push_back(shape);
+
+    Light * light = new PointLight(Vector(-1, -1, 1));
+    m_lights.push_back(light);
 }
 
 void Scene::render()
@@ -146,25 +158,38 @@ Vector Scene::traceRay(const Ray & ray)
 {
     Vector color;
 
+    vector< pair<Shape *, double> > hits = getRayHits(ray, 0.0);
+    if (hits.size() > 0)
+    {
+        color[0] = color[1] = color[2] = 1.0;
+    }
+
+    return color;
+}
+
+vector< pair<Shape *, double> >
+Scene::getRayHits(const Ray & ray, double minDist)
+{
+    vector< pair<Shape *, double> > hits;
+
     /* loop through all shapes in the scene */
     for (vector<Shape *>::iterator it = m_shapes.begin();
          it != m_shapes.end();
          it++)
     {
-        /* then intersect this inversely transformed ray with the shape */
         Solver::Result intersections = (*it)->intersect(ray);
 
         if (intersections.numResults > 0)
         {
-            color[0] = color[1] = color[2] = 1.0;
-        }
-        else
-        {
-            color[0] = 0.0;
-            color[1] = 0.0;
-            color[2] = 0.0;
+            for (int i = 0; i < intersections.numResults; i++)
+            {
+                if (intersections.results[i] > minDist)
+                {
+                    hits.push_back(pair<Shape *, double>(*it, intersections.results[i]));
+                }
+            }
         }
     }
-    return color;
-}
 
+    return hits;
+}
diff --git a/main/Scene.h b/main/Scene.h
index fbbea00..221566e 100755
--- a/main/Scene.h
+++ b/main/Scene.h
@@ -5,8 +5,13 @@
 #include <string>
 #include <map>
 #include <vector>
+#include <utility>
 #include "util/Ray.h"
 #include "shapes/Shape.h"
+#include "Light.h"
+
+#define SCENE_MAX_TRANSPARENT_HITS 8
+#define SCENE_TRANSPARENCY_THRESHOLD 0.01
 
 class Scene
 {
@@ -21,6 +26,8 @@ class Scene
         void load(const char * filename);
         void renderPixel(int x, int y, unsigned char * pixel);
         Vector traceRay(const Ray & ray);
+        std::vector< std::pair<Shape *, double> >
+            getRayHits(const Ray & ray, double minDist);
 
         /* rendering parameters */
         int m_width;
@@ -32,6 +39,7 @@ class Scene
 
         /* private data */
         std::vector<Shape *> m_shapes;
+        std::vector<Light *> m_lights;
         Transform m_transform;
         double m_view_plane_dist;
         int m_multisample_level_squared;
diff --git a/shapes/Shape.h b/shapes/Shape.h
index 566cb8c..d869b81 100644
--- a/shapes/Shape.h
+++ b/shapes/Shape.h
@@ -10,6 +10,7 @@
 class Shape
 {
     public:
+        Shape();
         virtual Solver::Result intersect(const Ray & ray) = 0;
         virtual Vector getNormalAt(const Vector & pt) = 0;
 
@@ -19,10 +20,13 @@ class Shape
             m_inverse = t.getInverse();
         }
         Transform & getTransform() { return m_transform; }
+        void setTransparency(double t) { m_transparency = t; }
+        double getTransparency() const { return m_transparency; }
 
     protected:
         Transform m_transform;
         Transform m_inverse;
+        double m_transparency;
 };
 
 #endif
diff --git a/util/Color.cc b/util/Color.cc
index 17e0065..e208979 100644
--- a/util/Color.cc
+++ b/util/Color.cc
@@ -9,7 +9,7 @@ const Color Color::blue = Color(0, 0, 1);
 
 Color::Color()
 {
-    r = g = b = 1.0;
+    r = g = b = 0.0;
 }
 
 Color::Color(double r, double g, double b)