utils.ts

export function vecAdd(vecOne: Array<number>, vecTwo: Array<number>){
    let vecSum: Array<number> = vecOne;

    vecSum[0] += vecTwo[0];
    vecSum[1] += vecTwo[1];
    vecSum[2] += vecTwo[2];

    return vecSum;
}

export function vecSubtract(vecOne: Array<number>, vecTwo: Array<number>){
    let vecSubt: Array<number> = vecOne;

    vecSubt[0] -= vecTwo[0];
    vecSubt[1] -= vecTwo[1];
    vecSubt[2] -= vecTwo[2];

    return vecSubt;
}

export function vecMultiply(vecOne: Array<number>, factor: number){
    vecOne[0] *= factor;
    vecOne[1] *= factor;
    vecOne[2] *= factor;

    return vecOne;
}

export function vecLength(vec: Array<number>){
    let length: number;
    length = Math.sqrt(vec[0]*vec[0] + vec[1]*vec[1] + vec[2]*vec[2]);
    return length;
}

export function vecNormalize(vec: Array<number>){
    let computedLength = vecLength(vec);
    if(computedLength == 0){computedLength = 1};

    let inverse = 1 / computedLength;

    let normalized: Array<number> = new Array;

    normalized[0] = vec[0] * inverse;
    normalized[1] = vec[1] * inverse;
    normalized[2] = vec[2] * inverse;

    return normalized;
}
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