3.3 Other particle-based rendering technologies

The above mainly discussed the modeling technology of mountain stone, an important component of landscape painting. Other modeling techniques based on particle deposition described below are only a supplement and example of the above modeling methods. These modeling concepts are completely consistent with the above mountain stone modeling based on particle deposition and stacking (overlapping) technology, except that some landscape painting objects, such as ink trees and raindrop textures, do not necessarily need textures, or only need a color ink setting method similar to shallow landscape painting.
1)Particle\sout-based tree rendering
Suppose that particle deposition is stacked according to the tree growth model of the extended L system to generate a particle swarm, and the particle size is adaptively constrained according to the tree shape defined by the extended L system, then the boundary formed by the periphery of the particle swarm can produce a shape similar to a tree. Figure 10 shows the particle tree generated by particle stacking. In addition, we made a comparison between normal rendering and ink rendering. In ink rendering, set the color of the overall shader to grayish black, the transparency of the tube shader to completely transparent, the color to grayish black, and the tip fade to about 0.6. Set the softening degree of the brush to above medium level, as shown in Figure 11.