HowToC:FollowAnObject

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Revision as of 23:35, 19 August 2008
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(How to follow an object with the camera)
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1. use a handle callback to register the most recently selected handle: 1. use a handle callback to register the most recently selected handle:
<code><pre> <code><pre>
 +int camfollow; // initialised to -1 in main
 +unsigned char *selected; // array storing selected state of all handles
void pickcb(int *id) { void pickcb(int *id) {
 + // ...
 +
 +}
 +</pre></code>
 +
 +2. in the standard dynamic callback, set the camera position if required
 +XYZ *iP; // array storing positions of all handles
 +<code><pre>
 +void callback(double *t, int *kc) {
 + // ...
 +
 + if (camfollow >= 0) {
 +
 +
 +
 + }
} }
</pre></code> </pre></code>

Revision as of 23:38, 19 August 2008

How to follow an object with the camera

Using handles, you can easily detect when an object has been right-clicked. With two pretty simple bits of code, you can then make the camera keep focussed on that object.

1. use a handle callback to register the most recently selected handle:

int camfollow; // initialised to -1 in main
unsigned char *selected; // array storing selected state of all handles
void pickcb(int *id) {
  // ...

}

2. in the standard dynamic callback, set the camera position if required XYZ *iP; // array storing positions of all handles

void callback(double *t, int *kc) {
  // ...

  if (camfollow >= 0) {



  }
}
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