“The Tar Monster: Creating a Character With Fluid Simulation” by Wiebe

  • ©Mark Wiebe and Ben Houston

  • ©Mark Wiebe and Ben Houston




    The Tar Monster: Creating a Character With Fluid Simulation



    Creating the Tar Monster in Scooby Doo 2 presented a unique challenge, because the desired effect of a continually flowing textured character with expressive features had never been done be- fore. Starting from a fluid simulator as in [Enright et al. 2002], we developed the liquid skin technique which applies a fluid layer over an animated character. In addition, the facial animation was pre- served by using localized morphing, whereby a specified portion of the simulation is made to match the Tar Monster geometry. The result is a character from whom fluid constantly emanates, with texture sliding down its body and fluid splashing during vigorous arm gestures. Similar previous work includes [Sumner et al. 2003], where the “TX” character is gradually liquefied. Our method, while producing a comparable result in that texture is applied to fluid flow on a character, uses quantities defined over the volume rather than particles for control and texture coordinates.


    Enright, D., Marschner, S., and Fedkiw, R. 2002. Animation and rendering of complex water surfaces. In Proceedings of SIGGRAPH 2002, ACM Press / ACM SIGGRAPH, Computer Graphics Proceedings, Annual Conference Series, ACM, 736–744.
    Houston, B., Wiebe, M., and Batty, C. 2004. Rle sparse level sets. In SIGGRAPH 2004 Sketches & Applications, ACM Press.
    Stam, J. 1999. Stable fluids. In Proceedings of the 26th annual conference on Computer graphics and interactive techniques, ACM Press/Addison-Wesley Publishing Co., 121–128.
    Sumner, N., Hoon, S., Geiger, W., Marino, S., Rasmussen, N., and Fedkiw, R. 2003. Melting a terminatrix. In SIGGRAPH 2003 Sketches & Applications, ACM Press.

ACM Digital Library Publication:

Overview Page: