2013/5/8 grtuxhangar team <hohora...@gmail.com>: > Hello, Thomas > > Sorry my question was not clear, and i probably misunderstood the feature. > So, > just a question: how do you define the main parent actuator axis rotation ? > that one which trigger every other child components.
I am using the normal rotate animation to rotate the main strut. Every attached hydraulic cylinder, link, etc. is then animated using the locked-track animation. For a hydraulic cylinder the piston and the cylinder housing each are animated using a locked-track animation tracking each other. For a gear scissor, a locked-track animation tracks from a point attached to the strut to a point on the axis. Two objects can be attached to the animation, allowing to animate a scissor. (The object and the slave object, are rotated such that the exactly fill the space between the two attachment points of the scissor). For the second type of animation I will add some pictures to the wiki later on. > Most of them are not rotating with a pure xyz axis rotation but very often > according to those alternate form (cf Vivian) . There is no difference in terms of what you can express. Both notations allow you exactly the same thing. For the animation a center point and an orientation (axis) are required to calculate the location and orientation of the rotation. Think of the center as the location of the hinge somewhere in space and of the axis as the actual orientation of the hinge. You can now either specify the position of the hinge and the orientation of its axis or (the alternate form) two points on the axis of the hinge, which are then used to calculate the center and orientation of the hinge. (If you use the alternate form the center and axis are automatically calculated from the two given points). There is no rotation that you can not describe with a single axis given by its xyz coordinates. > That the point i was asking for, and the solution i was looking for. > I could be on the wrong way. Tom ------------------------------------------------------------------------------ Learn Graph Databases - Download FREE O'Reilly Book "Graph Databases" is the definitive new guide to graph databases and their applications. This 200-page book is written by three acclaimed leaders in the field. The early access version is available now. Download your free book today! http://p.sf.net/sfu/neotech_d2d_may _______________________________________________ Flightgear-devel mailing list Flightgear-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/flightgear-devel
