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Scilab help >> Graphics > 3d_plot > geom3d

# geom3d

projection from 3D on 2D after a 3D plot

### Calling Sequence

`[x,y]=geom3d(x1,y1,z1)`

### Arguments

x1,y1,z1

real vectors of the same size (points in 3D).

x,y

real vectors of the same size as `x1`, `y1` and `z1`.

### Description

After having used a 3D plot function such as `plot3d`, `plot3d1` or `param3d`, `geom3d` gives the mapping between a point in 3D space `(x1(i),y1(i),z1(i))` and the corresponding point `(x(i),y(i))` in the projected 2D plan. Then all the 2D graphics primitives working on `(x,y)` can be used for superposition on the 3D plot.

### Examples

```deff("[z]=surface(x,y)","z=sin(x)*cos(y)")
t=%pi*(-10:10)/10;
// 3D plot of the surface
fplot3d(t,t,surface,35,45,"X@Y@Z")
// now (t,t,sin(t).*cos(t)) is a curve on the surface
// which can be drawn using geom3d and xpoly
[x,y]=geom3d(%pi/2,0,surface(%pi/2,0))```
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