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"Chris B" <c_b### [at] btconnect com> wrote in
news:3fdf2f74@news.povray.org:
> If you know the targetLocation before you translate the object and the
> object is defined at the origin, then you can rotate it before moving
> it. If you only need to rotate around the Y axis then the angle is the
> arctan in degrees of z / x. So you can use atan2d():
>
> #declare targetLocation = <3,4,5>;
> #declare targetAngle = atan2d(targetLocation.z,targetLocation.x);
>
> Hope I understood your question correctly.
I think you do understand my question, but when I use your formula I
don't get the expected results. I've output the relevant variable values
and copied them below. Only one or two of these objects are actually
pointing at or nearly at the origin...
#declare rotation = atan2d(z1,x1);
#object {
thing
rotate <0,rotation,0>
translate <x1,y1,z1>
}
Z: 0.1, X: 3.5, Rotation: 1.0
Z: 1.4, X: 3.0, Rotation: 25.0
Z: 2.3, X: 2.0, Rotation: 49.0
Z: 2.7, X: 0.8, Rotation: 73.0
Z: 2.5, X: -0.3, Rotation: 97.0
Z: 2.0, X: -1.2, Rotation: 121.0
Z: 1.2, X: -1.7, Rotation: 145.0
Z: 0.4, X: -1.8, Rotation: 169.0
Z: -0.4, X: -1.6, Rotation:-167.0
Z: -0.8, X: -1.1, Rotation:-143.0
Z: -1.0, X: -0.6, Rotation:-119.0
Z: -0.9, X: -0.1, Rotation: -95.0
Z: -0.7, X: 0.2, Rotation: -71.0
Z: -0.3, X: 0.3, Rotation: -47.0
Z: -0.1, X: 0.2, Rotation: -23.0
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