Triangles following curve (spline{} or other) As you see, there is somes issues along the path...

The main loop :
```#declare index=0;
#while(index<360)
object {
Triangle
}
#declare index=index + 2;
#end
```

The curve_Trans macro :
```#macro curve_Trans (Time, Sky, Foresight)
#local Location = <0,0,0> + myFunc(Time);
#local LocationNext = <0,0,0> + myFunc(Time + Foresight);
#local LocationPrev = <0,0,0> + myFunc(Time-Foresight);
#local Forward = vnormalize(LocationNext-Location);
#local Right = VPerp_To_Plane(Sky,Forward);
#local Up = VPerp_To_Plane(Forward,Right);
#local Matrix = Matrix_Trans(Right,Up,Forward,Location)
transform {
transform Matrix
}
#end
```

Here, the curve defined by a function, but the problem is the same with a spline :
```// --------------------------------------------------------------------------
// --- CURVE FUNCTION -------------------------------------------------------
//     x = cos(t) + 2.cos(2.t)
//     y = sin(t) - 2.sin(2.t)
//     z = 2.e.sin(3.t)
// --------------------------------------------------------------------------
#macro myFunc(thisTime)
< cos(thisTime) + 2*cos(2*thisTime),
sin(thisTime)-2*sin(2*thisTime),
2*sin(3*thisTime)>
#end
```

```// --- Returns a vector perpendicular to V1 and V2
#macro VPerp_To_Plane(V1, V2)
(vnormalize(vcross(V1, V2)))
#end

// --- VRotation() will find the rotation angle from V1 to V2 around Axis.
#macro VRotation(V1, V2, Axis)
(acos(min(vdot(vnormalize(V1),vnormalize(V2)),1))*(vdot(Axis,vcross(V1,V2))<0?-1:1))
#end

/ --- Projects a vector onto the plane defined by Axis.
#macro VProject_Plane(V, Axis)
#local A = vnormalize(Axis);
(V - vdot(V, A)*A)
#end

#macro Matrix_Trans(A, B, C, D)
transform {
matrix < A.x, A.y, A.z,
B.x, B.y, B.z,
C.x, C.y, C.z,
D.x, D.y, D.z>
}
#end
```