please simplify me (again…)

please simplify me (again…)

http://www.iquilezles.org/blog/?p=2848

Yet another example of code simplification that people don’t seem to want to do. It must be the 5th ot 6th time I ask people to do this change when programming a point-to-line distance computation: please, replace this ugly

float sdLine( vec2 a, vec2 b, vec2 p )

{

    vec2 ba = b - a;

    vec2 pa = p - a;

    float dist = (ba.x*pa.y - ba.y*pa.x) / distance(a, b);

    if( dot(a-b,p-b) < 0.0 ) 

        return distance(b, p);

    if( dot(b-a,p-a) < 0.0 ) 

        return distance(a, p);

    return abs(dist);

}

by the much more beautiful:

float sdLine( vec2 a, vec2 b, vec2 p )

{

    vec2 pa = p - a;

    vec2 ba = b - a;

    float h = clamp( dot(pa,ba)/dot(ba,ba), 0.0, 1.0 );

    return length( pa - ba*h );

}

Do it for the karma or something.