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one object rotating around another wih vec_rotateaxis
#332931
07/13/10 01:18
07/13/10 01:18
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Joined: Jan 2002
Posts: 300
Usa
Rich
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OP
Senior Member
Joined: Jan 2002
Posts: 300
Usa
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Hi, I am having trouble getting this to work properly, so I assume I am doing it wrong. I have two objects, one one which I need to rotates around the axis of another. I thought the function vec_rotateaxis did this, but it doesn't seem to be working as I expected. It seems to rotate it around the level's axis, but I am sure I am doing it incorrectly. Any suggestions would be appreciated, thanks!  Object B needs to rotate around Object A's (roll) Axis.
A8 com / A7 free
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Re: one object rotating around another wih vec_rotateaxis
[Re: Rich]
#332934
07/13/10 02:30
07/13/10 02:30
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Joined: Jun 2007
Posts: 1,337
Hiporope and its pain
txesmi
Serious User
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Serious User
Joined: Jun 2007
Posts: 1,337
Hiporope and its pain
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Hi, this code rotates 'you' around 'me'.
vec_diff ( vtemp, you.x, my.x );
vec_rotate ( vtemp, vector ( 0, AngSpeed * time_step, 0 ) );
// or
// vec_rotateaxis ( vtemp, vector ( 0, 1, 0 ), AngSpeed * time_step );
vec_add ( vtemp, my.x );
vec_set ( you.x, vtemp );
PD: rotation around Y axis is tilt 
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EDITED*Re: one object rotating around another wih vec_rotateaxis
[Re: txesmi]
#332977
07/13/10 11:42
07/13/10 11:42
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Joined: Jan 2002
Posts: 300
Usa
Rich
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Senior Member
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OP
Senior Member
Joined: Jan 2002
Posts: 300
Usa
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Hi, this code rotates 'you' around 'me'.
vec_diff ( vtemp, you.x, my.x );
vec_rotate ( vtemp, vector ( 0, AngSpeed * time_step, 0 ) );
// or
// vec_rotateaxis ( vtemp, vector ( 0, 1, 0 ), AngSpeed * time_step );
vec_add ( vtemp, my.x );
vec_set ( you.x, vtemp );
PD: rotation around Y axis is tilt Thanks  I will test those out soon! Much appreciated! And about the tilt thing, oops! I made a mistake, was in a hurry . EDIT****** It seems to be working :), but the object also slowly spirals inward towards the axis. I'll keep playing with it.
Last edited by Rich; 07/13/10 12:17.
A8 com / A7 free
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Re: one object rotating around another wih vec_rotateaxis
[Re: Rich]
#332987
07/13/10 13:29
07/13/10 13:29
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Joined: Jun 2007
Posts: 1,337
Hiporope and its pain
txesmi
Serious User
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Serious User
Joined: Jun 2007
Posts: 1,337
Hiporope and its pain
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 you'll need to normalize
vec_diff ( vtemp, you.x, my.x );
vec_rotate ( vtemp, vector ( 0, AngSpeed * time_step, 0 ) );
// or
// vec_rotateaxis ( vtemp, vector ( 0, 1, 0 ), AngSpeed * time_step );
vec_normalize ( vtemp, Radius );
vec_add ( vtemp, my.x );
vec_set ( you.x, vtemp );
or use a variable as angle holder
nAngle += AngSpeed * time_step;
nAngle %= 360;
vec_for_angle ( vtemp, vector ( 0, nAngle, 0 ) );
vec_normalize ( vtemp, Radius );
vec_add ( vtemp, my.x );
vec_set ( you.x, vtemp );
Salud!
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Re: EDITED*Re: one object rotating around another wih vec_rotateaxis
[Re: txesmi]
#332990
07/13/10 13:48
07/13/10 13:48
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Joined: Jan 2002
Posts: 300
Usa
Rich
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Senior Member
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Joined: Jan 2002
Posts: 300
Usa
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Works perfect! Thanks again  !!
A8 com / A7 free
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