dipityPix app

Monday, July 27, 2015

Another step toward validation

My progression toward a sufficiently accurate renderer continues.

There are some known problems with my renderer/scene/camera before we even start:
  • The scene is too dim for the iPhone camera (so ironically the renderer is not noisy enough)
  • Sensitivity of the camera not modeled
  • The spectral curves of the iPad are just a poor guess
  • No polarization (the iPad emits polarized light)
  • The iPad is being modeled as a diffuse source but its brightness should vary with angle.
  • I just guess the refractive index of the glass plate and ball (1.5)
  • Camera fov and position just in the ballpark.   View direction way off.
Left: rendered image.   Right: photograph.

1 comment:

Nick said...

It would be fun to gather some physical measurements to go with this series.

To learn the refractive index of the glass you could just shine a laser through and grab a protractor :)

If you don't have one already, I highly recommend building yourself a little spectrograph, just need a grating and some black construction paper :)