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.