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 <mailto: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*
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