Java Code Examples for com.jme3.math.FastMath#acos()

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Example 1
Source File: CurvesHelper.java    From MikuMikuStudio with BSD 2-Clause "Simplified" License 5 votes vote down vote up 
/**
 * This method transforms the first line of the bevel points positioning it
 * on the first point of the curve.
 * 
 * @param startingLinePoints
 *            the vbevel shape points
 * @param firstCurvePoint
 *            the first curve's point
 * @param secondCurvePoint
 *            the second curve's point
 * @return points of transformed bevel
 */
private Vector3f[] transformToFirstLineOfBevelPoints(Vector3f[] startingLinePoints, Vector3f firstCurvePoint, Vector3f secondCurvePoint) {
    Vector3f planeNormal = secondCurvePoint.subtract(firstCurvePoint).normalizeLocal();

    float angle = FastMath.acos(planeNormal.dot(Vector3f.UNIT_Y));
    planeNormal.crossLocal(Vector3f.UNIT_Y).normalizeLocal();// planeNormal is the rotation axis now
    Quaternion pointRotation = new Quaternion();
    pointRotation.fromAngleAxis(angle, planeNormal);

    Matrix4f m = new Matrix4f();
    m.setRotationQuaternion(pointRotation);
    m.setTranslation(firstCurvePoint);

    float[] temp = new float[] { 0, 0, 0, 1 };
    Vector3f[] verts = new Vector3f[startingLinePoints.length];
    for (int j = 0; j < verts.length; ++j) {
        temp[0] = startingLinePoints[j].x;
        temp[1] = startingLinePoints[j].y;
        temp[2] = startingLinePoints[j].z;
        temp = m.mult(temp);// the result is stored in the array
        if (fixUpAxis) {
            verts[j] = new Vector3f(temp[0], -temp[2], temp[1]);
        } else {
            verts[j] = new Vector3f(temp[0], temp[1], temp[2]);
        }
    }
    return verts;
}