# Function:ss2ucf

## ss2ucf

Unset the camera mid/focus point - revert to auto mid-point.

## Prototype

```void ss2ucf(void); ```

## Description

Reset the camera mid/focus point so that an automatic mid-point is calculated. To set the focus manually, use ss2scf.

 ss2scf Set the camera mid/focus point. ss2qcf Query camera focus point and state.

## Code Example

```#include <stdio.h> #include <stdlib.h> #include <time.h> #include "s2plot.h" void numcb(int *N) { if (*N != 1) return; ss2ucf(); /* Go back to rotating around centre */ } int main(int argc, char *argv[]) { int i, N = 20; /* Loop variables */ float x, y, z; /* Random data */ XYZ focus; /* Point to rotate about */ int wc = 1; /* Use world coordinates */ srand48((long)time(NULL)); /* Seed random numbers */ s2opend("/?",argc, argv); /* Open the display */ s2swin(-1.,1., -1.,1., -1.,1.); /* Set the window coordinates */ s2box("BCDET",0,0,"BCDET",0,0,"BCDET",0,0); /* Draw coordinate box */ s2slw(3); /* Set line width */ for (i=0;i<N;i++) { x = drand48()*2.0 - 1.0; /* Random (x,y,z) */ y = drand48()*2.0 - 1.0; z = drand48()*2.0 - 1.0; s2sci(15*drand48() + 1); /* Random colour */ s2pt1(x,y,z,1); /* Plot the point */ } focus.x = drand48()*2.0 - 1.0; /* Random rotation point */ focus.y = drand48()*2.0 - 1.0; focus.z = drand48()*2.0 - 1.0; ss2scf(focus, wc); /* Set the rotation point */ s2sch(0.7); /* Set text height */ s2textxy(-1,0,0,"Rotate camera - then press 1 followed by +"); cs2sncb(&numcb); /* Install number callback */ s2show(1); /* Open the s2plot window */ return 1; } ```

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