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rotating an object around a certain point
Posted: Thu Sep 04, 2003 2:47 pm
by bernardfrancois
hello,
is it possible to rotate a 3d object around a certain point, and not around it's center?
Posted: Thu Sep 04, 2003 8:53 pm
by coldarchon
are you talking about a distance or a track algorithm?
Posted: Fri Sep 05, 2003 12:37 am
by Kale
You could use a little math and use Sin() and Cos() to plot a circular path around a point.
Posted: Fri Sep 05, 2003 11:31 am
by bernardfrancois
I tried to do that, but there's something wrong with my procedure:
Procedure RotateParticleEmitterArround(emitter,xpos,ypos,zpos,xrot,yrot,zrot)
xdelta=Abs(ParticleEmitterX(emitter)-xpos)
ydelta=Abs(ParticleEmitterY(emitter)-ypos)
zdelta=Abs(ParticleEmitterZ(emitter)-zpos)
; X rotation
ymov=Sin(xrot)*ydelta
zmov=Cos(xrot)*zdelta
; Y rotation
zmov=Sin(yrot)*zdelta
xmov=Cos(yrot)*xdelta
; Z rotation
RotateParticleEmitter(emitter,xrot,yrot,zrot)
MoveParticleEmitter(emitter,xmov,ymov,zmov)
EndProcedure
anyone who sees what's my mestake?