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/* ==========================================================================
MUSCLE_C
=============================================================================
FUNCTION NAMES
float VecLen -- calculates a vector length.
float CosAng -- compute the cosine angle between two vectors.
activate_muscle -- activate a muscle.
act_muscles -- activate muscles.
reset_muscles -- reset all the muscles.
C SPECIFICATIONS
float VecLen ( float *v )
float CosAng ( float *v1, float *v2 )
activate_muscle ( HEAD *face, float *vt, float *vh,
float fstart, float fin, float ang, float val )
act_muscles ( HEAD *face )
reset_muscles ( HEAD *face )
DESCRIPTION
This module is where all the muscle action takes place. This module
comes as is with no warranties.
SIDE EFFECTS
Unknown.
HISTORY
Created 16-Dec-94 Keith Waters at DEC's Cambridge Research Lab.
============================================================================ */
#include <math.h>
#include <stdio.h>
#include "head.h"
#ifdef _WIN32
#pragma warning (disable:4244) /* Disable bogus conversion warnings. */
#pragma warning (disable:4305) /* VC++ 5.0 version of above warning. */
#endif
/* Some <math.h> files do not define M_PI... */
#ifndef M_PI
#define M_PI 3.14159265358979323846
#endif
#define DTOR(deg) ((deg)*0.017453292) /* degrees to radians */
#define RTOD(rad) ((rad)*57.29577951) /* radians to degrees */
#define RADF 180.0 / M_PI
/* ======================================================================== */
/* float VecLen ( vec ) */
/* ======================================================================== */
/*
** Caculates the length of the vector.
*/
float VecLen ( float *v )
{
return (float) sqrt(v[0]*v[0] + v[1]*v[1] + v[2]*v[2]);
}
/* ======================================================================== */
/* float CosAng ( v1, v2 ) */
/* ======================================================================== */
/*
** Rotates the facial muscles 90.0 degrees.
*/
float CosAng ( float *v1, float *v2 )
{
float ang, a,b ;
a = VecLen ( v1 ) ;
b = VecLen ( v2 ) ;
ang = ((v1[0]*v2[0]) + (v1[1]*v2[1] ) + (v1[2]*v2[2])) / (a*b) ;
return ( ang ) ;
}
/* ======================================================================== */
/* activate_muscle ( face, vt, vh, fstart, fin, ang, val ) */
/* ======================================================================== */
/*
** activate the muscle.
*/
void
activate_muscle (HEAD *face, float *vt, float *vh, float fstart, float fin, float ang, float val)
{
float newp[3], va[3], vb[3] ;
int i,j,k,l ;
float valen, vblen ;
float cosa, cosv, dif, tot, percent, thet, newv, the, radf ;
radf = 180.0/ M_PI ;
the = ang / radf ; ;
thet = cos ( the ) ;
cosa = 0.0 ;
/* find the length of the muscle */
for (i=0; i<3; i++)
va[i] = vt[i] - vh[i] ;
valen = VecLen ( va ) ;
/* loop for all polygons */
for (i=0; i<face->npolygons; i++) {
/* loop for all vertices */
for (j=0; j<3; j++) {
/* find the length of the muscle head to the mesh node */
for (k=0; k<3; k++)
vb[k] = face->polygon[i]->vertex[j]->xyz[k] - vh[k] ;
vblen = VecLen ( vb ) ;
if ( valen > 0.0 && vblen > 0.0) {
cosa = CosAng ( va, vb ) ;
if ( cosa >= thet ) {
if ( vblen <= fin ) {
cosv = val * ( 1.0 - (cosa/thet) ) ;
if ( vblen >= fstart && vblen <= fin) {
dif = vblen - fstart ;
tot = fin - fstart ;
percent = dif/tot ;
newv = cos ( DTOR(percent*90.0) ) ;
for ( l=0; l<3; l++)
newp[l] = (vb[l] * cosv) * newv ;
}
else {
for ( l=0; l<3; l++)
newp[l] = vb[l] * cosv ;
} /* endif vblen>fin */
for (l=0; l<3; l++)
face->polygon[i]->vertex[j]->xyz[l] += newp[l] ;
} /* endif vblen>fin */
} /* endif cosa>thet */
} /* endif mlen&&tlen */
} /* end for j vertices */
} /* end for i polygon */
}
/* ======================================================================== */
/* act_muscles ( face ) */
/* ======================================================================== */
/*
** activate the muscles
*/
void
act_muscles ( HEAD *face )
{
int i ;
/*
* Loop all the muscles.
*/
for (i=0; i<face->nmuscles; i++) {
/*
* Check to see if the muscle is active.
*/
if (face->muscle[i]->active) {
activate_muscle ( face, face->muscle[i]->head,
face->muscle[i]->tail,
face->muscle[i]->fs,
face->muscle[i]->fe,
face->muscle[i]->zone,
face->muscle[i]->mval ) ;
/*
* Reset the muscle activity.
*/
face->muscle[i]->active = 1 ;
}
}
}
/* ======================================================================== */
/* reset_muscles ( face ) */
/* ======================================================================== */
/*
** Resets the muscles of the face. This is achieved by reversing
** the muscle contraction.
*/
void
reset_muscles ( HEAD *face )
{
int i,j,k ;
for ( i=0; i<face->npolygons; i++ ) {
for ( j=0; j<3; j++ ) {
for ( k=0; k<3; k++ )
face->polygon[i]->vertex[j]->xyz[k] =
face->polygon[i]->vertex[j]->nxyz[k] ;
} /* end for j */
} /* end for i */
}
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