added jitter and radius parameters to light objects; not using them yet

git-svn-id: svn://anubis/fart/trunk@255 7f9b0f55-74a9-4bce-be96-3c2cd072584d

main/Light.cc

@@ -1,11 +1,18 @@
 
 #include "Light.h"
 #include "util/Vector.h"
+#include "util/Ray.h"
 
 Light::Light()
 {
     m_position = Vector(0, 0, 0);
     m_diffuse_color = Color::white;
     m_specular_color = Color::white;
+    m_jitter = 1;
+    m_radius = 1.0;
 }
 
+Vector Light::getJitterPosition() const
+{
+    return m_position + Vector::randomVector() * m_radius;
+}

main/Light.h

@@ -14,6 +14,8 @@ class Light
         void setPosition(refptr<Vector> vec) { setPosition(*vec); }
         const Vector & getPosition() const { return m_position; }
 
+        Vector getJitterPosition() const;
+
         void setDiffuseColor(const Color & diffuse)
         {
             m_diffuse_color = diffuse;
@@ -25,11 +27,15 @@ class Light
             m_specular_color = specular;
         }
         const Color & getSpecularColor() const { return m_specular_color; }
+        void setJitter(int j) { m_jitter = j; }
+        int getJitter() const { return m_jitter; }
 
     protected:
         Vector m_position;
         Color m_diffuse_color;
         Color m_specular_color;
+        double m_radius;
+        int m_jitter;
 };
 
 #include "PointLight.h"

parser/nodes.h

@@ -130,6 +130,12 @@ class ItemsNode : public Node
 {
 };
 
+class JitterNode : public IntegerNode
+{
+    public:
+        JitterNode(int i) : IntegerNode(i) {}
+};
+
 class LightNode : public Node
 {
 };

parser/parser.lex

@@ -49,6 +49,7 @@ diffuse             return DIFFUSE;
 exposure            return EXPOSURE;
 height              return HEIGHT;
 intersect           return INTERSECT;
+jitter              return JITTER;
 light               return LIGHT;
 look_at             return LOOKAT;
 material            return MATERIAL;

parser/parser.yy

@@ -68,6 +68,7 @@ static refptr<Node> parsed_scene_node;
 %token EXPOSURE;
 %token HEIGHT;
 %token INTERSECT;
+%token JITTER;
 %token LIGHT;
 %token LOOKAT;
 %token MATERIAL;
@@ -190,6 +191,11 @@ intersect: INTERSECT LCURLY bool_items RCURLY {
             }
          ;
 
+jitter: JITTER number {
+        $$ = new JitterNode($2->getInteger());
+      }
+      ;
+
 light: LIGHT LCURLY light_items RCURLY {
             $$ = new LightNode();
             $$->addChildren($3);
@@ -216,6 +222,12 @@ light_item: POSITION vector {
           | COLOR vector {
                 $$ = new ColorNode($2->getVector());
             }
+          | radius {
+                $$ = $1;
+            }
+          | jitter {
+                $$ = $1;
+            }
           ;
 
 material: MATERIAL LCURLY material_items RCURLY {

scenes/subtract-subtract.fart

@@ -15,6 +15,7 @@ scene
     light
     {
         position <-1, -3, 4>
+        jitter 5
     }
 
     plane

util/Ray.cc

@@ -18,14 +18,7 @@ Ray::Ray(const Vector & origin, const Vector & direction)
 
 Ray Ray::randomRay()
 {
-    double x, y, z;
-    do
-    {
-        x = 2.0 * rand() / RAND_MAX - 1.0;
-        y = 2.0 * rand() / RAND_MAX - 1.0;
-        z = 2.0 * rand() / RAND_MAX - 1.0;
-    } while (x*x + y*y + z*z <= 1.0);
-    return Ray(Vector(0, 0, 0), Vector(x, y, z));
+    return Ray(Vector(0, 0, 0), Vector::randomVector());
 }
 
 /*

util/Vector.cc

@@ -1,7 +1,10 @@
 
+#include <stdlib.h>                 /* rand() */
+#include <math.h>
+
+#include <iostream>
+
 #include "Vector.h"
-#include <iostream>
-#include <math.h>
 
 Vector::Vector()
 {
@@ -17,6 +20,18 @@ Vector::Vector(double x, double y, double z)
     m_array[2] = z;
 }
 
+Vector Vector::randomVector()
+{
+    double x, y, z;
+    do
+    {
+        x = 2.0 * rand() / RAND_MAX - 1.0;
+        y = 2.0 * rand() / RAND_MAX - 1.0;
+        z = 2.0 * rand() / RAND_MAX - 1.0;
+    } while (x*x + y*y + z*z > 1.0);
+    return Vector(x, y, z).normalize();
+}
+
 Vector & Vector::normalize()
 {
     double length = mag();

util/Vector.h

@@ -9,6 +9,7 @@ class Vector
     public:
         Vector();
         Vector(double x, double y, double z);
+        static Vector randomVector();
         double & operator[](int idx) { return m_array[idx]; }
         double operator[](int idx) const { return m_array[idx]; }
         Vector operator-() const;

vim/syntax/fart.vim

@@ -10,7 +10,7 @@ endif
 
 syn case match
 
-syn keyword fartKeywords ambient color define diffuse exposure height look_at material max_depth multisample options position radius reflectance rotate scale shininess size specular translate transparency union up vfov width
+syn keyword fartKeywords ambient color define diffuse exposure height jitter look_at material max_depth multisample options position radius reflectance rotate scale shininess size specular translate transparency union up vfov width
 syn keyword fartObjects box camera cyl intersect light plane scene sphere subtract union
 syn match fartNumber "\(^\|\W\)\@<=[+-]\=\(\d\+\)\=\.\=\d\+\([eE][+-]\=\d\+\)\="