S.N.A.K.E.: A Dynamically Reconfigurable Artificial Sensate Skin ...

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c:\Documents and Settings\Gerardo\My ...)\Thesis\Code\Example1\OpenGLControl.cpp
527 vector_t a, b;
528
529 // calculate the vectors A and B
530 // note that v[3] is defined with counterclockwise winding in mind
531 // a
532 a.x = v[0].x - v[1].x;
533 a.y = v[0].y - v[1].y;
534 a.z = v[0].z - v[1].z;
535 // b
536 b.x = v[1].x - v[2].x;
537 b.y = v[1].y - v[2].y;
538 b.z = v[1].z - v[2].z;
539
540 // calculate the cross product and place the resulting vector
541 // into the address specified by vector_t *normal
542 normal->x = (a.y * b.z) - (a.z * b.y);
543 normal->y = (a.z * b.x) - (a.x * b.z);
544 normal->z = (a.x * b.y) - (a.y * b.x);
545
546 // normalize
547 normalize(normal);
548 }
549