# Download Creating and Animating the Virtual World by David R. Haumann, Jessica K. Hodgins (auth.), Prof. Nadia PDF

By David R. Haumann, Jessica K. Hodgins (auth.), Prof. Nadia Magnenat Thalmann, Prof. Daniel Thalmann (eds.)

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Example text

2 is very appropriate. The main special issue is determining a suitable mass matrix k. To achieve an intuitive, physically-based method for specifying the underconstrained behavior, we can model the articulated figure as being composed of a series of mass points. If we let r i be the vector position of the ith mass point, and mi its mass, then we should use the Jacobian matrix J to convert the masses of the individual mass points into the generalized masses which appear in k : Ji = CJr/CJx k= Lm;liJ~ i (eq.

11···.. """"", I I"...................... I Figure 6 Force Panel Additional pseudo forces, such as parasitic drag can be added to tune the realism. The result is a vehicle that will maneuver with amazing realism. The object can be "test flown" in isolation or with other testbed objects to verify the object's force parameters. The object is saved to a file when the desired physical model is accepted. The NPSOFF file force descriptions are always editable with any ASCII text editor. 010000 no 19.

The major disadvantage to this approach was that these NPSOFF files were extremely large and difficult to edit. As scenarios requiring different colors on a primitive were rare at best, the inclusion of a set of parametrized primitive descriptions was required. For example, a cylinder token is specified by a height, radius, and quality factor that indicates the maximum number of polygons or mesh points to use in the rendering. The advantages were automatic minimal 43 Table 1 UNITS OF MEASURE Token Function Argument Type(s) Table 2 FORCE CHARACTERISTICS Token Function Argument Type(s) units of dimension char name char units of force char type char units of mass char origin float.