Assignment:

Assume the sensor is in the z plane and its width is arranged from -1 to 1 and it's height is between -(ny/nx) to (ny/nx) (as in hw 3). Emit photons uniformly from a sphere with radius 0.1 and with center (0,0,3) and a uniform spectrum E(lambda) = constant. Also have a diffuse sphere with the reflectance of the red square in the macbeth color checker. Use center (1,0,3) and radius 0.5. If a photon hits it, let it be reflected or absorbed probabilistically. If it hits the light, absorb it.

Also add an infinite plane at z=1 with a "pinhole" of radius 0.05 at (0, 0, 1). Only photons that pass through that hole are allowd to hit the sensor.

Finally, have the diffuse sphere move to (2,1,4) during the frame.

Results:

1B photons - no motion blur

1B photons - with motion blur