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*
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