In view cone snippet

This article has multiple issues. Please help improve it or discuss these issues on the talk page. (Learn how and when to remove these template messages)

This article has no  links to other VDC articles. Please help improve this article by adding links  that are relevant to the context within the existing text.
January 2024

This article is an orphan, meaning that few or no articles link to it.
You can help by  adding links to this article from other relevant articles.
January 2024

Snippet

bool CMyEnt::InViewCone( const Vector &vecSpot, float flTolerance )
{
    //Get the direction of origin in front of us
    Vector vDirection = ( vecSpot - GetAbsOrigin() );
    VectorNormalize( vDirection );

    //Get our forward direction
    Vector vForward;
    AngleVectors( GetAbsAngles(), &vForward );

    //Compute angle of both direction vectors
    float flDot = DotProduct( vDirection, vForward );

    //Check if angle is within tolerance 
    //-1 = opposite of forward direction
    //1 = matching forward direction
    //0 = 90 degrees 
    if ( flDot > flTolerance )
	return true;
    return false;
}

Extra

To pass in an angle of degrees, you must convert it.

//90 Degrees
flTolerance = cos( 90 );

bool bInCone = InViewCone( vOrigin, flTolerance );