Rotating Vector Around Direction.

[Lehm]

Okay I'm playing with creating a simple weapon that launches a projectile that after 2 seconds releases 6 other projectiles in a kind of star pattern. To do this I need to rotate an offset rotation around the spawner's rotation angle. I've almost got it working correctly. The subprojectiles do launch in a star pattern, but around the wrong axis. I haven't figured out which axis this is, it seems to differ.

local int i;
local Rotator OffsetR;
local Vector OffsetV;

For (i = 0; i < 6; i++)
{
OffsetR.Pitch=4000;
OffsetR.Yaw=0;
OffsetR.Roll=0;

OffsetV = QuatRotateVector(QuatFromAxisAndAngle(Vector(Rotat ion), i*(65536/6)), Vector(OffsetR));

p = Spawn(class'WeaponL.RocketSSSubProj',,,,Rotation+R otator(OffsetV));

}

[Hsoolien]

Make sure your projectile is not rotating itself, this can throw stuff off

[Xyx]

The projectile only rotates itself after it has been spawned.

I'm not too good with Quats. Are you sure this calculation cannot be done with regular vector/rotator math? Like, get a blank vector, give it a Yaw rating for the star point, and then rotate it by the projectile's rotation.

[Lehm]

The projectile only rotates itself after it has been spawned.

I'm not too good with Quats. Are you sure this calculation cannot be done with regular vector/rotator math? Like, get a blank vector, give it a Yaw rating for the star point, and then rotate it by the projectile's rotation.

I'm sure it probably could be done with euler. But I can do it with a single line with Quats. The solution turned out to be to add the orignial direction before calculating the offset.

For (i = 1; i < 7; i++)
{
OffsetR.Pitch=4000;
OffsetR.Yaw=0;
OffsetR.Roll=0;

OffsetV = QuatRotateVector(QuatFromAxisAndAngle(Vector(Rotat ion), i), Vector(Rotation+OffsetR)); //I have no idea why the variable 'i' works for the rotation.


p = Spawn(class'WeaponL.RocketSSSubProj',,,,Rotator(Of fsetV));
p.SetDrawScale(0.25);
}

[Xyx]

You can do it in a single line using Euler as well, so I fail to see your point.