Florin is right. But if you are tied to Euler angles, specially at initial and final position, you can do something like:
// euler2Quat is method to convert a Tuple3f to Quat4f Quat4f qInit = euler2Quat(initAngle); Quat4f qEnd = euler2Quat(endAngle); Quat4f qMid = new Quat4f(); // intermediate angle is abtained by quaternion interpolation // position is a float value between 0.0f (init) and 1.0f(end) qMid.interpolate(qInit, qEnd, position) Of course this have limited use. Check if it fit your needs. Good luck Alessandro --- Florin Herinean <[EMAIL PROTECTED]> escreveu: > MessageThere is obviously no difference since you're still using quaternions > like euler angles. In other words, as long as you use pitch/yaw/roll you're > always have gimbal locks, regardless of what intermediate transformations > you use. If you don't want gimbal locks, just stop using them. > > Cheers, > > Florin > -----Ursprüngliche Nachricht----- > Von: Discussion list for Java 3D API > [mailto:[EMAIL PROTECTED] Auftrag von Cavill, SA (Stuart) > Gesendet: Mittwoch, 25. August 2004 15:19 > An: [EMAIL PROTECTED] > Betreff: [JAVA3D] Gimbal lock > > > Hi, > I'm having problems with Gimbal Lock in my JAVA 3D code ( all I need to do > is rotate a simple cube in 3 dimensions). > I initially used > > transx.rotX(anglex); > transy.rotX(angley); > transz.rotX(anglez); > trans4m.set(transx); > trans4m.mul(transy); > trans4m.mul(transz); > transformGroup.setTransform(trans4m); > > which caused gimbal lock > > I then tried to use > public Quat4f setQ(float pitch, float yaw, float roll) > { > Quat4f qx =new Quat4f((float) > Math.cos(pitch/2f),(float)Math.sin(pitch/2f),0,0); > Quat4f qy =new Quat4f((float) > Math.cos(yaw/2f),0,(float)Math.sin(yaw/2f),0); > Quat4f qz =new Quat4f((float) > Math.cos(roll/2f),0,0,(float)Math.sin(roll/2f)); > Quat4f qt =new Quat4f(); > qt.set(qx); > qt.mul(qy); > qt.mul(qz); > return(qt); > > } > trans4m.set(q2); > transformGroup.setTransform(trans4m); > > but again gimbal lock occurred. > > I would appreciate any comments on what I am doing wrong or seeing an > example of the correct way to go about this problem without gimbal lock > occurring. > Any help would be greatly appreciated. > > regards > > > Stuart Cavill > email: [EMAIL PROTECTED] > _______________________________________________________ Yahoo! Acesso Grátis - navegue de graça com conexão de qualidade! http://br.acesso.yahoo.com/ =========================================================================== To unsubscribe, send email to [EMAIL PROTECTED] and include in the body of the message "signoff JAVA3D-INTEREST". For general help, send email to [EMAIL PROTECTED] and include in the body of the message "help".
