Question #6

To add super-sampling, we again change the rayCast method:

// For each pixel
for(i=0; i<w; i++)
{
	for(j=0; j<h; j++)
	{
		if(useSuperSampling)
		{
			Point3d pts[] = new Point3d[4];
			pts[0] = new Point3d((double)i-0.5, (double)j-0.5, 0.0);
			pts[1] = new Point3d((double)i+0.5, (double)j-0.5, 0.0);
			pts[2] = new Point3d((double)i-0.5, (double)j+0.5, 0.0);
			pts[3] = new Point3d((double)i+0.5, (double)j+0.5, 0.0);

			Color3f accumCol = new Color3f();

			int count = 0;
			for(int k=0; k<4; ++k)
			{
				if(owner.shootRay(pts[k], dir, col, nor, pt))
				{
					++count;
					Color3f result = new Color3f(col);
					result.scale((float)computeStrength(nor,pt));
					result.clamp((float)0.0, (float)1.0);
					accumCol.x += result.x;
					accumCol.y += result.y;
					accumCol.z += result.z;
				}
			}

			if(count != 0)
			{
				accumCol.x/=count;
				accumCol.y/=count;
				accumCol.z/=count;
				g.setColor(accumCol.get());
			}
			else
			{
				g.setColor(backgroundColour);
			}
		}
		else
		{
			...
		}
		// now paint this pixel
		g.fillRect( i, j, 1, 1);
	}
}