Thanks Tony and Joel for more awesome help. I didn't get as much time as I would have liked to work on it tonight. I will have to continue tomorrow night (and probably into the weekend). I'll keep the thread posted. Thanks!
P.S. cool flight sim vid, Joel. Are you a fellow X-Wing/Tie Fighter fan? Freespace perhaps? On Thu, Mar 1, 2012 at 10:29 PM, Joel R. <joelru...@gmail.com> wrote: > http://www.youtube.com/watch?v=5y6a_oFtNiI > > > On Thu, Mar 1, 2012 at 10:35 PM, Tony "omega" Sergi > <omegal...@gmail.com>wrote: > >> This actually will work in Source, as the input/view stuff is basically >> identical: >> http://articles.thewavelength.net/269/ >> -Tony >> >> >> >> On Fri, Mar 2, 2012 at 5:09 AM, Craig Louie <craiglo...@gmail.com> wrote: >> >>> Thanks Joel! I'll also try out your method when I get home. I'll keep >>> everyone posted on my results. >>> >>> Thanks! >>> >>> >>> >>> On Thu, Mar 1, 2012 at 11:12 AM, Joel R. <joelru...@gmail.com> wrote: >>> >>>> Quaternion.h >>>> http://pastebin.com/hxTBab3T >>>> >>>> Quaternion.cpp >>>> http://pastebin.com/2WizAewD >>>> >>>> Quaternion Rotation Formulas (Yaw/Pitch/Roll) >>>> http://pastebin.com/BHRvcbCG >>>> >>>> I got most of the quaternion stuff from Ogre engine and converted to >>>> work on Source Engine. The functions you will be interested in using are >>>> FromRotationMatrix, ToRotationMatrix, AxisAngle, ToAxisAngle, >>>> GetRotationTo, ToAxes, Slerp, GetAngles, GetMatrix >>>> >>>> So basically you'll do what's below: (this is psuedocode, function >>>> names are not exact!) >>>> >>>> >>>> Quat current, target; >>>> current.FromRotationMatrix( ent->EntityWorldTransform() ); >>>> >>>> target = current; >>>> target = yaw( target, 10 ); //10 degrees to the right, this function is >>>> not part of Quat class for some reason >>>> >>>> current = Slerp( current, target, 0.2 ); //This is only 20%, you'll >>>> need to calculate the angle difference between current/target, and then >>>> move based on your angles per second speed. >>>> >>>> matrix3x4_t newRot; >>>> current.ToRotationMatrix( newRot ); >>>> ent->SetWorldTransform( newRot ); >>>> >>>> >>>> >>>> Enjoy! >>>> >>>> >>>> >>>> >>>> >>>> >>>> On Thu, Mar 1, 2012 at 12:46 PM, Joel R. <joelru...@gmail.com> wrote: >>>> >>>>> The quaternion calculations you're doing are similar to just >>>>> manipulating the Euler Angles, which cause Gimbal Lock. >>>>> >>>>> The way I did it in my flight simulation is to create a Current >>>>> Quaternion (from the starting Matrix Transformation when user spawns) and >>>>> Target Quaternion (where they want to rotate to). I also used some >>>>> formulas to rotate the quaternion in the individual yaw/pitch/roll >>>>> orientations, I recommend googling for these formulas. I then used the >>>>> Slerp formula to animate from the Current quaternion to the Target >>>>> quaternion. Slerp will avoid Gimbal-Lock entirely, which is very neat. >>>>> >>>>> After you do those calculations, just convert the new Current >>>>> Quaternion into a Matrix Transformation and set the Entity to take that >>>>> transform. >>>>> >>>>> I've used this to control the entity rotation as well as the camera, >>>>> it allows you to do some pretty nifty tricks. >>>>> >>>>> I'll look for the code, if I still have it, and I'll post it here for >>>>> you. Or if you figure out, please post a video =D >>>>> >>>>> Regards, >>>>> >>>>> Joel >>>>> >>>>> >>>>> >>>>> On Thu, Mar 1, 2012 at 11:55 AM, Minh <minh...@telus.net> wrote: >>>>> >>>>>> You can try spitting out the results to a file so you can observe >>>>>> the hitch more closely. >>>>>> Look for a function called COM_Log >>>>>> >>>>>> COM_Log ( "viewangle_hitch.txt", "%.2f %.2f %.2f \n", >>>>>> viewangles.x, viewangles.y, viewangles.z ); >>>>>> >>>>>> On 3/1/2012 3:55 AM, Craig Louie wrote: >>>>>> >>>>>> Thanks for the reply Saul. I hadn't thought of disabling prediction. >>>>>> I just gave it a shot. I changed to "engine->ClientCmd( "cl_predict 0" >>>>>> );" >>>>>> in cdll_client_int.cpp. With another test, the unsmooth rotation when >>>>>> looking straight up/down still occurs. >>>>>> >>>>>> My main theories at this point: >>>>>> 1) Something is occurring in VectorAngles(vec_for_out, vec_up_out, >>>>>> viewangles) to cause this. VectorAngles() might not produce straight >>>>>> up/down Euler angles properly - choking because of aliasing perhaps? This >>>>>> is a big guess because I don't know the inner workings of VectorAngles(). >>>>>> 2) There is some code somewhere else that is conflicting with the >>>>>> full, unclamped rotation I've implemented. I've tried to remove all >>>>>> instances of pitch clamping, for example. But I may have missed >>>>>> something. >>>>>> Also, it's possible mouse rotation is somehow conflicting with my changes >>>>>> to joystick rotation. >>>>>> >>>>>> Here's a video of the issue I'm seeing. It happens a few times in the >>>>>> video. You'll see it happen the first time at about 11 seconds in when >>>>>> the >>>>>> text on the floor twists/shakes. >>>>>> http://www.youtube.com/watch?v=PLN641Qsn08 >>>>>> >>>>>> Thanks! >>>>>> >>>>>> >>>>>> >>>>>> On Wed, Feb 29, 2012 at 11:34 PM, Saul Rennison < >>>>>> saul.renni...@gmail.com> wrote: >>>>>> >>>>>>> The hitching is most likely something trying to revert your angle >>>>>>> changes (I.e. in prediction). Have you tried disabling prediction? >>>>>>> >>>>>>> >>>>>>> On Thursday, March 1, 2012, Craig Louie wrote: >>>>>>> >>>>>>>> Hello Coders, >>>>>>>> >>>>>>>> I'm trying to create a space flight combat game with the Source >>>>>>>> SDK. Currently, I am trying to achieve rotation around the player's >>>>>>>> local >>>>>>>> axes for airplane-like pitch, yaw and roll. Below is the code I'm >>>>>>>> using to >>>>>>>> try to implement full 3D rotation. I'm running into a problem where the >>>>>>>> player's view twists and hitches unsmoothly when the player looks >>>>>>>> straight >>>>>>>> up or straight down. I think this may be because of the inherent >>>>>>>> problem of >>>>>>>> aliasing/Gimbal-lock when using Euler angles. Any advise? >>>>>>>> >>>>>>>> //######################################### >>>>>>>> //Take the Euler angles for the player's orientation (viewangles) >>>>>>>> and convert them to vectors. >>>>>>>> Vector vec_for, vec_rt, vec_up, vec_for_out, vec_rt_out, vec_up_out; >>>>>>>> AngleVectors(viewangles, &vec_for, &vec_rt, &vec_up); >>>>>>>> >>>>>>>> //Take the resulting vectors and the desired rotation amounts and >>>>>>>> convert them to Quaternions. >>>>>>>> Quaternion turn_q, look_q, roll_q; >>>>>>>> // NOTE: Assumes axis is a unit vector, non-unit vectors will bias >>>>>>>> the resulting rotation angle (but not the axis) >>>>>>>> VectorNormalize(vec_up); >>>>>>>> AxisAngleQuaternion(vec_up, turn_angle, turn_q); >>>>>>>> >>>>>>>> VectorNormalize(vec_rt); >>>>>>>> AxisAngleQuaternion(vec_rt, look_angle, look_q); >>>>>>>> >>>>>>>> VectorNormalize(vec_for); >>>>>>>> AxisAngleQuaternion(vec_for, roll_angle, roll_q); >>>>>>>> >>>>>>>> //Convert the quaternions to matrices. >>>>>>>> matrix3x4_t xform0, xform1, xform2; >>>>>>>> QuaternionMatrix(turn_q, xform0); >>>>>>>> QuaternionMatrix(look_q, xform1); >>>>>>>> QuaternionMatrix(roll_q, xform2); >>>>>>>> >>>>>>>> //Combine matrices. >>>>>>>> matrix3x4_t xformA, xformB; >>>>>>>> MatrixMultiply(xform0, xform1, xformA); >>>>>>>> MatrixMultiply(xformA, xform2, xformB); >>>>>>>> >>>>>>>> //Rotate the vectors with our combined rotation matrix. >>>>>>>> VectorRotate(vec_for, xformB, vec_for_out); >>>>>>>> VectorRotate(vec_rt, xformB, vec_rt_out); >>>>>>>> VectorRotate(vec_up, xformB, vec_up_out); >>>>>>>> >>>>>>>> //Determine the new viewangles based on our rotated vectors. >>>>>>>> VectorAngles(vec_for_out, vec_up_out, viewangles); >>>>>>>> //######################################### >>>>>>>> >>>>>>>> I put this code into in_joystick.cpp in the JoyStickMove( float >>>>>>>> frametime, CUserCmd *cmd ) function. >>>>>>>> >>>>>>>> >>>>>>>> Thanks! >>>>>>>> >>>>>>>> >>>>>>>> >>>>>>> >>>>>>> -- >>>>>>> >>>>>>> >>>>>>> Kind regards, >>>>>>> *Saul Rennison* >>>>>>> >>>>>>> _______________________________________________ >>>>>>> To unsubscribe, edit your list preferences, or view the list >>>>>>> archives, please visit: >>>>>>> https://list.valvesoftware.com/cgi-bin/mailman/listinfo/hlcoders >>>>>>> >>>>>>> >>>>>>> >>>>>> >>>>>> >>>>>> _______________________________________________ >>>>>> To unsubscribe, edit your list preferences, or view the list archives, >>>>>> please >>>>>> visit:https://list.valvesoftware.com/cgi-bin/mailman/listinfo/hlcoders >>>>>> >>>>>> >>>>>> >>>>>> _______________________________________________ >>>>>> To unsubscribe, edit your list preferences, or view the list >>>>>> archives, please visit: >>>>>> https://list.valvesoftware.com/cgi-bin/mailman/listinfo/hlcoders >>>>>> >>>>>> >>>>>> >>>>> >>>> >>>> _______________________________________________ >>>> To unsubscribe, edit your list preferences, or view the list archives, >>>> please visit: >>>> https://list.valvesoftware.com/cgi-bin/mailman/listinfo/hlcoders >>>> >>>> >>>> >>> >>> _______________________________________________ >>> To unsubscribe, edit your list preferences, or view the list archives, >>> please visit: >>> https://list.valvesoftware.com/cgi-bin/mailman/listinfo/hlcoders >>> >>> >>> >> >> >> -- >> -Tony >> >> >> _______________________________________________ >> To unsubscribe, edit your list preferences, or view the list archives, >> please visit: >> https://list.valvesoftware.com/cgi-bin/mailman/listinfo/hlcoders >> >> >> > > _______________________________________________ > To unsubscribe, edit your list preferences, or view the list archives, > please visit: > https://list.valvesoftware.com/cgi-bin/mailman/listinfo/hlcoders > > >
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