Ben Chambers wrote:
> 
> I have a vector which is perpendicular to a plane.
> From this vector, how should I rotate an object so
> that it lies in the plane?  The vector is represented
> by a point along that axis.
> 

Not sure what you need, but you might want to try John VanSickle's
Reorient macro:

#macro Reorient(Axis1,Axis2)
        #local vX1=vnormalize(Axis1);
        #local vX2=vnormalize(Axis2);
        #local vY=vnormalize(vcross(vX1,vX2));
        #local vZ1=vnormalize(vcross(vX1,vY));
        #local vZ2=vnormalize(vcross(vX2,vY));
        matrix < vX1.x, vY.x,vZ1.x, vX1.y,vY.y,vZ1.y, vX1.z,vY.z, vZ1.z,
0,0,0 >
        matrix < vX2.x,vX2.y,vX2.z,  vY.x,vY.y, vY.z, vZ2.x,vZ2.y,vZ2.z,
0,0,0 >
#end

-- 
Margus Ramst

Personal e-mail: mar### [at] peakeduee
TAG (Team Assistance Group) e-mail: mar### [at] tagpovrayorg
Home page http://www.hot.ee/margusrt

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