diff -r 76b254ce92cf -r 6493fb65f0b1 src/scene.cc
--- a/src/scene.cc	Wed Mar 19 17:18:59 2008 +0100
+++ b/src/scene.cc	Wed Mar 26 00:52:27 2008 +0100
@@ -29,6 +29,56 @@
 #include "common.h"
 #include "scene.h"
 
+int DefaultSampler::initSampleSet()
+{
+	if ( phase == 0 )
+	{
+		phase++;
+		return w*h;
+	}
+	else return 0;
+}
+
+Sample* DefaultSampler::nextSample(Sample *prev)
+{
+	DefaultSample *s = new DefaultSample;
+	if (prev)
+	{
+		DefaultSample *sp = static_cast<DefaultSample*>(prev);
+		s->sx = sp->sx + 1;
+		s->sy = sp->sy;
+		if (s->sx >= w)
+		{
+			s->sx = 0;
+			s->sy++;
+		}
+		if (s->sy >= h)
+		{
+			delete s;
+			return NULL;
+		}
+		s->x = (Float)s->sx/h - (Float)w/h/2.0;
+		s->y = (Float)s->sy/h - 0.5;
+	}
+	else
+	{
+		s->x = -(Float)w/h/2.0;
+		s->y = -0.5;
+		s->sx = 0;
+		s->sy = 0;
+	}
+	return s;
+}
+
+void DefaultSampler::saveSample(Sample *samp, Colour &col)
+{
+	DefaultSample *sp = static_cast<DefaultSample*>(samp);
+	Float *buf = buffer + 3*(sp->sy*w + sp->sx);
+	*(buf++) = col.r;
+	*(buf++) = col.g;
+	*(buf++) = col.b;
+}
+
 void Camera::rotate(const Quaternion &q)
 {
 	/*
@@ -75,6 +125,13 @@
 	eye = eye + fw*p + left*u + up*v;
 }
 
+Ray Camera::makeRay(Sample *samp)
+{
+	Vector3 dir = p + u*(0.5/f)*samp->x + v*(-0.5/f)*samp->y;
+	dir.normalize();
+	return Ray(eye, dir);
+}
+
 /* http://www.siggraph.org/education/materials/HyperGraph/raytrace/rtinter3.htm */
 bool BBox::intersect(const Ray &ray, Float &a, Float &b)
 {