(March 2, 2002) I'm trying to implement the foliar scattering model (FSM) devised by Baranoski and Rokne. Initial results are not quite what I'm expecting, but the renderings look pretty nevertheless.
(April - May) I have been experimenting with translucency in leaves and petals. Daffodils are a fine example of flowers where it is possible to partially see through a petal. The features of objects seen through a petal appear blurred, and I have been using different types of stochastic sampling to produce the blurring.
An initial rendering with lots of image noise, due to a completely random sampling distribution. Blurred translucency of the petals is visible:
An early attempt at backlighting:
More translucency tests with two leaves, using frontlighting and backlighting:
A comparison of four renderings making use of the lux_compute_indirect_light() function. This function computes the indirect diffuse light arriving at a surface. The indirect light contribution gets added to the contribution for the direct light (according to my definition, direct light includes the primary light rays that hit the backside of a surface and transmit through to the front side.) The lighting consists of a spherical light behind the daffodil and a dome reflection map that provides ambient light. Top left - no indirect light; top right - indirect light from the front only; bottom left - indirect light from the back only; bottom right - indirect light from both front and back.
A daffodil plant rendered with a spherical light source and sky reflection map. Still needs work on the colors...