5.1 Conclusion
Thatched grass based rooves have been incorporated in many computer graphic applications. This proposed method can capture their physical appearance and characteristics with the ability to control the primary vein, the leaf’s width and height and the width of the secondary veins.
Themodeling method of thatched grass blade used skeleton-based modeling. The primary vein used a circle and curve to control its diameter and length. A thin slab was used to simulate a leaf. A displacement map was used to control the width and the height of the primary and secondary veins.
The shading model was implemented in Renderman Shading Language. This shading model can capture all the physical appearances of grass blades. A BRDF model based on [8] was applied on the front side to calculate the reflectance of thatched grass blades. In addition, the back sideused a multipole BSSRDF based on [9]to capture the diffuse and translucency of thatched grass. A scar on each blade used texture mapping. This enhanced the rendered image to look more natural and realistic.
5.2 Discussion
This proposed method is easier to model than the previous method. When comparing the qualitative nature of this proposed method with the photographsand the previous method, it looks more natural and is based on the physical appearance ofthe grass blade. However, when attaching each grass blade to a bamboo rod,a whole roof has a repetition of grass blades. Because of that, it’s unable to control each grass blade. In addition, a further development of this limitation needs to be corrected in the future.