tangent vectors of kochanek bartels splines i m working on a system which uses a given set of d key frame positions x y z to control an imaginary camera movement i m using kochanek bartels splines as described in the siggraph proceedings to create a variable number of inbetweens between the key frames i want the inbetweens to be given in the form x y z dx dy dz where the last three argumentsa are the x y and z component of the viewing direction vector of the camera when positioned at x y z the method presented by kochanek and bartels only deals with the positions of the inbetween view points to be generated i ve tried to set the viewing direction at a view point equal to the chord between the two adjacent view points which in general are not key frames but this causes a sligt discontinuity of the viewing direction vector at the key frame positions although the spatial movement seems to work fine and i m quite certain i think that i ve not simply made an implementation error now i wonder if anyone out there has used this spline form for similar purposes and how they decided the viewing vectors i d appreciate replies to be emailed to me at iharkest lise unit no anyone else interested in the answer will be sent a summary of the replies if they contact me n g e a r k e s t a d iharkest lise unit no comp sc nth norwegian institute of technology some people play hard to get i play hard to want ford fairlane
